Enhanced protection from videocapture the introduction of horizontal and vertical distortion of the image

 

(57) Abstract:

The invention relates to methods of protection against videocapture. Improvements to the way anti-video-copy lead to abnormally low amplitude video signal recorded on an illegal copy. In one embodiment, these improvements introduced into the plot of the television image outside the visible area of the screen, immediately before the pulses of the horizontal or vertical synchronization, but in an active video signal is a negative going signal to the television receiver or VCR is a clock, thus causing premature horizontal or vertical reverse beam. In one embodiment, is formed (in the right part of the image outside the visible screen area) cellular structure of alternating regions of gray and black, which leads to the fact that on a television receiver, which reproduces the illegal copy, the selected row line reverse beam occurs earlier than in the normal mode, with continuous horizontal offset of image information on these lines. This significantly impairs the visibility of the second screen area, causes vertical instability of the image. In another embodiment, a narrowing of the selected line synchronizing pulses, changing the start of the vertical flyback. The technical result is the creation of a method and device effective protection videocapture. 17 C. and 72 C.p. f-crystals, 107 ill.

Improvements for protection from removal video dubs, and improvements lead to additional deterioration of image quality, if there is a copy made from a protected account, and additionally they reduce the visibility is not permitted records taken from a protected account.

Methods of protection from videocapture well known. For example, the way Ryan, which is disclosed in U.S. patent N 4631603, published on December 23, 1986, included in the description as a reference to the source of information (see summary):

The video signal is modified so that the television receiver provides from the modified video signal is a normal color image, and recording on the tape of the modified video signal is obtained, as a rule, unacceptable image.

This invention is based on the fact that the usual system including cassette via equalizing or broadened pulses) normal video signal from the added pseudo-sync pulses. Under the false synchronizing pulses are any impulse other than normal, which height below the top of the normal sync pulse and have a duration equal to at least 0.5 MS. The number of such false sync is added to the normal video signal during the vertical interval blanking, and for each of the false sync should be a positive pulse of suitable amplitude and duration.

As a result, the automatic gain control at the VCR will perform an erroneous measurement of the level of the video that will lead to incorrect recording of the video signal. The result is an unacceptable image quality when playing records."

In column 2, beginning with line 5, indicated that the added pairs of pulses, each pair is a negative going false sync pulse followed by a positive going pulse AGC (automatic gain control)) leads to the fact that the scheme of the automatic level control (gain) in the VCR mistakenly perceives the level of the video signal and produces a correction gain, which is fair "the primary method of copy protection" causes that the amplitude of the video signal, which must be recorded, is abnormally low.

When viewed prohibited to copy, some of the observed effects are in line breaks (positional displacement) and vertical offset of the image. These phenomena occur or not, often depends largely on the nature of the image, i.e., from the presence in the image is white (light) and black (dark) areas.

Thus, despite the fact that usually this known method provides excellent protection from copying, in some combinations, including the VCR, cassette recorder and a television receiver, this method allows to obtain an image on the copy that is acceptable to see if the audience and allow the poor quality of the image.

In addition, some cassette recorders and televisions are well-known methods of copy protection provide a small deterioration of the image.

Some markets selling rewritten videos, have a large number of "pirate" copies, i.e. copies of tapes are not permitted to copy, despite their protection from mines is s bad image quality which works by well-known methods of copy protection. Thus, a need exists for improvements in the way of copy protection, which would worsen the image quality even more than the well-known methods of protection.

According to the present invention described above, known from the prior art is the "main" method of copy protection, improved by additional modification of the video signal in several ways so that it met the necessary requirement to the core of the image, in which the efficiency of the primary method of copy protection is maximum.

Additional modifications include the damping of the active video in the part of the image that is outside the useful area of the screen, just before the advent of (1) signals, horizontal synchronization (sync) or (2) signal field synchronization (sync) and paste in a suppressed part of this signal (relative to the video signal having a smaller amplitude) is perceived by the television receiver or VCR as the synchronization signal and, thus, there is a wrong synchronization Cass is about only certain rows or fields of the video signal results in considerable deterioration of the image is not permitted copies.

Another modification of narrow pulses of horizontal synchronization, while the television receiver perceives a false signal field synchronization, and also the signal will affect certain VCRs.

When lowercase modification of the right edge of the image is replaced by a visible "cellular" structure (like a chess Board), consisting of black and gray rectangles. The width of this cellular structure is chosen so that it was within the portion of the image that is outside the useful area of the screen (not visible), if obtaining the image using a standard television receiver. It is clear that, if the image is bright (such as middle gray), then the left edge of the black rectangle on specific lines of the video signal will start ahead of time horizontal reverse, as it is negative going (to the level of damping) slice pulse.

If the image is dark, then the right edge of the gray box (adjacent to the dark area of the image) on specific lines of the video signal will trigger a premature reversal of the beam on each line, as it is a negative going cut back and white, and negative amplitude - black).

In one embodiment, the cellular structure of the lower case modification is generated at a frequency that is slightly not the same as the repetition frequency of the fields of the video signal, so there is slow moving plaid patterns up or down relative to the image with the speed at which any given point is shifted from the lower part to the upper part of the image or Vice versa in about 1 second

Cellular structure does not affect the image if you're playing the original (authorized) cassette, as in TV, there are no signals that are in some way abnormal.

However, when playing illegal (not allowed or "pirated" copy of a tape using a VCR, signal attenuation, resulting due to the above-described known method of copy protection, in combination with cellular structure leads to the fact that in a television receiver reverse beam line scan occurs prematurely on each line of the video signal, which has a black or gray rectangle depending on the image and characteristics of the VCR and what the actual content (level) image of the previous video. If the content of the image light (white level), then the left edge of the black cell causes a negative going transition to black; if the content of the image is dark, then the right edge of the gray cells causes a negative going transition from gray to follow the dark area (usually the blanking level).

The difference between rows, ending in a dark or gray area, in turn, is causing the horizontal offset for the video information, i.e., oscillation, moving slowly up or down the image.

The tendency of the television receiver to perform reverse (premature execution of a string reverse) is used to facilitate the transition from light to dark (left edge of the black cell or right edge of the gray cells) before the true signal horizontal synchronization will be on videotrace.

Stimulated thus premature reverse is the reason that the imaging information on the subsequent line appears prematurely, i.e., is the horizontal offset to the right by an amount equal to the distance between the negative transition and its location in front of the true signal line si the video.

Somewhat similar modification in relation to the vertical image is that inserted alternating light and dark bands on the location of the active video in the last few rows selected videoplay in the lower part of the image outside the useful area of the screen. Strips are inserted directly before the interval vertical blanking and/or extend over the first few lines of the vertical interval blanking.

This modification of the field frequency is performed in several ways. In one embodiment, several of the active videotron (five or so) immediately before the signal field synchronization form so that their level was changed (alternated) between the blanking level and the gray level (usually about 30% of the peak white) with a frequency of about 1 to 5 cycles per second. This can lead to desynchronization of the speed regulation system of the drum in the VCR when copying or erroneous vertical reverse course in a television receiver, the image is not permitted copies will have a vertical instability (jumping up and down) with the same frequent rows with alternating (modulated): white-black-white, inserted into the end of each videorola or alternating videopolis.

In this case, we have the same result: loss of vertical sync in a copying VCR or a television receiver due to the fact that the inserted structure is perceived as a signal of the field synchronization, if the amplitude of the signal is reduced due to the automatic gain control to a value that provides copy protection.

This vertical modification in another embodiment also apply to the first few lines of the subsequent interval vertical blanking.

Adding pulses to portions of the video signal after the normal pulse line or field synchronization causes abnormal vertical reverse motion of the beam at this point, therefore, it is effective for improvement of the known primary form of copy protection. Typically, these additional pulses after pulse field synchronization pulses post-field synchronization) are, for example, on lines 22-24 television signal NTSC.

Thus, these methods according to the invention provide optimal conditions with cocksurity not permitted copies with a maximum level and

(2) subjective deterioration with the maximum level of operation of the VCR in the record mode and playback.

The television receiver in response to horizontal and vertical modification performs horizontal or vertical reverse beam of anomalous points. On the recording VCR in the copy mode and the reproducing VCR in play mode may also be harmful influence, as in the case of a television receiver, which in horizontal and vertical versions mistakenly perceives incremental signals.

In the case of the VCR will be amazed at the color scheme, and the resulting distortion of the image will be added to the distortion caused by the new way of copy protection.

This additional effect to that effect, which was already described above. This is because the recorder processes the color information in a special way. Videoskatia include inaccurate color reproduction and intermittent or permanent loss of color.

Therefore, the purpose of the modifications is to further degrade the entertainment neatnik method of copy protection.

The third modification to the video signal includes the narrowing of pulses of horizontal synchronization. In combination with the video signal is copy-protected, which has reduced the amplitude of the signal when dubbing (copying), this narrowing leads to a VCR or TV receiver responds to the false signals of the field sync, the vertical reverse beam is not in the place that corresponds to the beginning of the field, and as a result, this leads to additional deterioration of image quality.

This modification reduces the width (duration) of the pulses of the horizontal synchronization on specific lines (for example, line 250 - 262) videopal. These narrow pulses of horizontal synchronization, when combined with the video signal of reduced amplitude, in many television receivers and VCRs initiate a false vertical reverse beam, further worsening the displayed image.

If there are checkered patterns (lines 10 - 250), the narrowing of the pulses of the horizontal synchronization also increases the distortion of the cellular structure when the execution is not permitted copies.

It is noticed that the quality degradation from the copy provides a relatively small deterioration in the image quality or relatively minor deterioration modes "record" or "play" on the VCR.

Thus, combining known methods, and these methods can significantly reduce the vividness of illegal copies when using a large number of combinations of the video recorder and television receiver than in the case of using only the main well-known method of copy protection.

The establishment of horizontal checkered patterns or vertical modification only in those parts of the television image, which are outside the useful area of the screen, leads to the fact that when viewing the original recording signal or cellular structure or vertical modification is not visible on the screen and the actual existence for the viewer of the original recording is unknown.

In other embodiments, the user of the method for efficiency may change the area of the image. To improve the efficiency of the method of copy protection, the user can select the compression overview when viewed "legal" entry).

Thus, in violation of the standards of TV broadcasting modifications can be extended to the visible parts of the field of video, but the image will still be acceptable in many applications. More t is Ino to increase the efficiency of anticooperative.

The modified signal in any case displays fine on any television receiver or monitor, provided that the signal has the correct amplitude. When the amplitude of the modified signal is reduced as illegal copies, the conditions become optimal for the image using a television receiver or playback using VCR a distorted image.

This will occur in a copying mutually loaded the VCR when using two tape recorders, copying (illegally) the entry to which is applied the primary method of anticooperative of the above-mentioned U.S. patent N 4631603.

Modification of the video signal according to the present invention besides the fact that lead to the absence of horizontal or vertical stability in a television receiver, also affect normal cassette recorders during recording and playback in a similar manner as described above.

Cassette recorders use pulse horizontal sync to the correct position pulse signal color synchronization. If the pulse signal color than the t loss of color or color distortion.

Horizontal modification is caused by an erroneous positioning of the front line synchronization. This will be used in cassette recorders when recording and when playing back a copy (secure copy), resulting in the loss/distortion of color.

This effect may also occur independently in a television receiver.

As well as a television receiver will show a tendency to breach the field synchronization as a result of implementation of this method, the same will happen in a cassette recorder. As a result, the cassette recorder will be a violation of the synchronization system speed control drum.

Modifications of the disclosed here, will ensure that there will always be conditions required for obtaining the maximum distortion of the image, and not rely on case (displays a specific image, when these conditions exist.

Thus, the above methods, which may include horizontal and/or vertical modification and/or narrowing of the pulse horizontal sync, significantly improves the above-described main known method sasiyvarulo video when an attempt is made to remove not allowed up.

In another embodiment, to enhance the horizontal image vibration when illegal copying of the magnetic tapes are used pulses post-pseudo(false) horizontal sync amplitude approximately -20 IRE (-40 IRE is equal to the amplitude of the normal sync pulse and a duration of approximately 1 to 2 μs, the position of which varies approximately in the range of 1 to 2 μm after the color burst signal.

Although described here is considered for the case of the television standard NTSC, anyone ordinary skilled in the art will understand that these modifications can be used for TV standard SECAM or PAL.

In addition, there is also disclosed in accordance with the invention, several methods and devices for removal or cancellation of the above-described modifications of the video, which allow you to freely copy and review copies.

A way to cancel and device in one embodiment, replaces or shifts the level of the pulses during the vertical or horizontal modification on the gray signal with a fixed level, and cancel modification narrowed synchrom the next method uses the added pulses preliminary horizontal synchronization the pulses after the horizontal synchronization or weakening by averaging. Also discovered and a new way of cancellation of the known primary method of protection against videocapture.

In Fig. 1a and 1b shown, respectively, in the normal image and the modified image with the cellular structure in the horizontal modification and place a vertical modification.

In Fig. 2a and 2b shows the image resulting from the signal of normal amplitude, respectively, with and without cellular structure.

In Fig. 3a, 3b and 3c shows the same images as they appear on a television receiver, if the signal has a reduced amplitude, without the cellular structure, cellular structure and vertical modification, respectively.

In Fig. 4 shows the plot of the video signal from the cellular structure;

In Fig. 5a and 5b shown, respectively, in the plot of the video signal with a vertical modification is not applicable to the interval of the horizontal and vertical blanking and vertical modification, covering the interval vertical blanking.

In Fig. 5c shows the additional vertical modification covering internetopena invention.

In Fig. 7a, 7b shows waveforms illustrating the operation of the circuit of Fig. 6a, 6b, 6c.

In Fig. 8 shows more detail of the flicker generator of Fig. 6b.

In Fig. 9 shows another variant of the electric circuit to ensure that the modifications of the video.

In Fig. 10 shows a known electrical circuit isolation clock.

In Fig. 11a - 11b shows the shape of signals illustrating the narrowing of the pulse horizontal sync.

In Fig. 12a shows a block diagram of an electric circuit for narrowing the pulse horizontal sync.

In Fig. 12b shows a waveform illustrating the operation of the electrical circuit of Fig. 12a.

In Fig. 13a, 13b illustrates in greater detail the circuit for narrowing the pulse horizontal sync.

In Fig. 14a, 14b illustrates a block diagram of a device for combining narrow sync pulse from the horizontal and vertical versions.

In Fig. 15 shows in block diagram a device for removing various modifications of the video.

In Fig. 16, 17, 18 shows the electrical circuit to remove advanced signals method of copy protection by level shift and replace lowercase sync.

On fiane using the new sync and replace the position of the color burst signal.

In Fig. 20 shows a third electric circuit for removing signals improved method of copy protection using multiplication.

In Fig. 21, 22, 23 are shown three additional electrical circuits to remove signals improved method of copy protection by using the switching means.

In Fig. 24a, 24b, 24c shows the electrical circuit for cancellation of improved signals, using the extension of sync.

In Fig. 25a - 25b shows the waveforms of the electric circuit of Fig. 24a, 24b.

In Fig. 26 shows another electric circuit for the destruction of enhanced signals of the way by averaging over constant component and weakening.

In Fig. 27 shows an additional electric circuit destruction advanced signals by limiting level.

In Fig. 28 shows another electric circuit for the destruction of enhanced signals.

In Fig. 29a, 29b shows waveforms illustrating the destruction of the enhanced signal by increasing the amplitude of the clock.

In Fig. 30 shows the electrical circuit for the destruction of the perfect is Kai scheme for the destruction of enhanced signals using schemes tracking and locking.

In Fig. 32a, 32b shows waveforms illustrating the destruction of the enhanced signal by adding the high-frequency signal.

In Fig. 33 shows a diagram for the connection of electrical circuits for the destruction of enhanced signals.

In Fig. 34a, 34b and 34c shows waveforms illustrating the destruction of sync on the maximum and minimum.

In Fig. 35a, 35b shows waveforms illustrating the effect of extended sync.

In Fig. 36a, 36b shows additional points, bounding pulses at the maximum and minimum.

In Fig. 37 shows the electrical diagram for the improved cellular structure that uses pulses that follow the clock.

In Fig. 38a - 38e shows waveforms illustrating the operation of the electrical circuit of Fig. 37.

In Fig. 39a shows the electrical scheme for the destruction of the improvements associated with the introduction of the pulse after the clock.

In Fig. 39b - 39d shows waveforms illustrating the operation of the electrical circuit of Fig. 39a.

In Fig. 40a, 40d, 40g shows the electrical schematic for the destruction of false pulses ical schemes Fig. 40a, 40d, 40g.

In Fig. 41a shows the electrical scheme for the destruction of false pulses post-synchronization by narrowing pulse.

In Fig. 41b shows the corresponding waveforms illustrating the operation of the electrical circuit of Fig. 41a.

In Fig. 42a, 42b shows the electrical circuit for cancelling known primary form of copy protection.

In Fig. 43a - 43b shows waveforms illustrating the operation of the electrical circuit of Fig. 42a, 42b.

Modification of line frequency (cellular structure) signal.

In Fig. 1a shows the normal TV picture 10 (not showing any actual videos), i.e., includes left and right sections 14, 16, outside the useful area of the screen, and the upper and lower sections 7, 9, outside the useful area of the screen. The portion of the image bounded by the dashed line 13 represents the visible video signal (corresponding to the useful area of the screen).

The plot of the television image outside the useful area of the screen, as is known, represents a portion of a television image, which is not visible on standard television receivers. From Saudia by the manufacturer so to display a little less than 100% of the transmitted image area.

Plots of the television image, which under normal conditions are not visible, are called outside the useful area of the screen. These plots can be seen on professional monitors with a larger area of the scanning beam.

However, all standard television receivers operate in a mode in which the image is limited to the useful area of the screen and, therefore, added cellular structure and modified lines at the end of each field will not be displayed on such a standard television receivers sold in the United States and in other places.

In Fig. 1b shows a modified television image 12 in accordance with certain modifications of the present invention. It also includes areas outside the useful area of the screen 14, 16. In the right side area 16 formed cellular structure 20 consisting of alternating gray boxes 24 and black rectangles.

Information containing in this cellular structure 24, 26, provides improved copy protection, as described below. When voprosu it is in the area 16. Vertical modification signal is inserted in the lower part of the region outside the useful area of the screen 9 and therefore it is also not visible.

In Fig. 2a shows video 30 includes left and right sections 32, 34 outside the useful area of the screen. A valid video signal 36 contains an element of vertical and horizontal image 38 (such as, for example, the cross). Box 30 corresponds to the prior art, and it is clear that the cellular structure and vertical modification signal is not included in it. In it also there is no reduction of signal amplitude, i.e. it does not have known the way of copy protection.

In Fig. 2b shows the field 30 with the addition of the cellular structure 42 in the region of 34 outside the useful area of the screen with the external boundary 13 and adding the vertical structure modification 87 to the lower section 9. Since the amplitude of the signal is normal, the cellular structure 42 and/or vertical structure 87 not affect the appearance of the cross 38, which is shown in the normal form.

It is clear that in Fig. 2b shows that would have appeared on the monitor, which shows the full size of the field, and would not have appeared on a normal television receiver.

Nebo is th receiver will play a false image because of abnormally low amplitude signal; cassette recorders used for recording and reproduction copies also may affect the harmful effects.

In this case, for example, will disrupt the operation of the servo system cassette recorders that will lead to positional instability of the image.

In Fig. 3a shows the image 50, resulting in a reduced signal amplitude, i.e. in accordance with the known method of copy protection, which operates at relatively insensitive cassette recorder, but without adding checkered patterns.

On this Fig. shown only the actual visible area (inside the border 13 of Fig. 2a, 2b) of the image on a standard television receiver. It is seen that the cross 38 is displayed normally, as in this case, the content of the image such that no horizontal offset.

In this case, there is a method of copy protection does not protect against copying, because the image remains visible.

In Fig. 3b shows the impact of the presence of the cellular structure 42 of Fig. 2b, when the signal amplitude is reduced, i.e., when there is a method of copy protection is used in conjunction with a cellular structure.

As shown in enlarged scale in Fig. 3c, portions 43 of the vertical part of the cross 38 is shifted horizontally by an amount dependent on the distance between the left edge of the black areas 44 checkered patterns and place of the true signal horizontal synchronization on each line (not shown).

It is obvious that the image 50 in Fig. 3b is significantly degraded. This effect is further strengthened (not shown) due to slow moving plaid patterns 42 up or down in the vertical direction so that the impression that the horizontal displacement move, i.e. "Bob". This leads to the fact that the image actually becomes invisible and, therefore, essentially protected copies.

According to the invention the cellular structure 42 of Fig. 2b typically includes five black rectangles 44, each of which alternates with medium-gray rectangles 46. (For clarity, several of these rectangles shown in Fig. 2b).

Found that the maximum degradation of the image occurs, if the height and the

The signal level of the black rectangles 44 is installed between the blanking level and the black level for NTSC (black level blanking signals PAL or SECAM same), and when the black level for PAL and SECAM, and the amplitude of medium-gray rectangles 46 - approximately 30% of the peak white level.

Cellular structure 42 causes the zigzag structure, as shown in Fig. 3b; in other embodiments, there can be only one black rectangle 44, or two, three, or four or more on the field 30 of Fig. 2b. In addition, the dimensions (height and width) black rectangles 44 should not be uniform.

This technique causes premature horizontal reverse in an environment with low amplitude video signal by providing a negative going front, i.e. from the instantaneous level of the image at the starting point of the black rectangles 44 to the black level, the preceding signals, horizontal synchronization, in at least certain rows of the image. Cellular structure 42 shown in Fig. 2b, is one of such structures, which leads to the proposed effect.

Usual duration (width) the cellular structure 42 is approximately 1.0 to 2.5 μs, which prelimiting image, which is visible on the screen, i.e., limited to the area outside of the useful area of the screen, and it's not "sets" on a normal line blanking interval.

In other embodiments, the pulse horizontal sync narrowed, and this allows the cellular structure to be wider. In this case, you will be provided a greater horizontal displacement, but this will result in a non-standard original video, which, however, can be used for certain applications, not related to the TV program. In addition, you do not want a particular amplitude of medium-gray 46 and/or black rectangles 44 were exactly as described above.

Any effects arising from the changed relative position of the front of the pulse horizontal sync and color burst signal can be adjusted by corresponding movement and/or expansion of the color burst signal.

In Fig. 4 shows an interval of 60 linear damping for a single videotrace with a plot of the cellular structure. Pulse horizontal sync 62 usually starts in 1.5 µs after the start of the interval 60 to linear damping.

A valid signal 66, 68 there until the just before the interval 60 to linear damping replaced or signal 74 medium-gray level, either signal 76 with a black level. (Gray level 74 and black level 76 shown in Fig. 4 for illustration only). Because of the loss of section 70 of the valid signal 66 problems do not occur because, as explained above, in a standard television receiver the actual plot of the video signal is still not visible, he is the image area that is outside the useful area of the screen.

The passage 80 from level 66 valid video signal down to the black level 76 is provided for the television receiver signal horizontal sync. This effect (as explained above) occurs only when the display signal has a reduced amplitude due to the way the copy protection.

The overall image is not shifted to the right because there is an additional gray level 74 (gray areas checkered patterns). This would happen in the case if, for example, on the right side of the image would be a solid black stripe from top to bottom. Alternating grey and black levels provides the effect of a zigzag, as shown in Fig. 3b, which, as found, in fact for any person making an image is unacceptable.

In Fig. 4 Tala damping 60.

It is evident from Fig. 4 it is clear that all the modified video signal is reduced to the removal of a small area of the valid video signal 70 and replace it with either the gray level 74 or black level 76.

As described above, the increase of the oscillations leads to cellular structure slowly moves upwards in the image, or Vice versa. Found that, when moving from the lower part of the image in the upper part of the image and Vice versa takes approximately one second, then it turns out the optimal deterioration of image entertainment. It's a moving rocking caused by the fact that for the generation of the cellular structure is used rectangular signal whose frequency is slightly shifted relative to the fifth harmonic of the frequency of the field, i.e., for television NTSC frequency is in the range between 295 and 305 Hz. The corresponding frequency for PAL or SECAM is in the range of 245 to 255 Hz. This asynchronous offers the required slow moving in the cellular structure. As noted above, even if such asynchronicity is missing and the cellular structure is a static position, this method still provides a significant advantage.

Frequency sexymale, when a signal of low amplitude is again reproduced or represented on the screen. The best effect is usually given frequency, concluded between 180 and 360 Hz to NTSC and between 150 and 300 Hz for PAL (3 to 5 times the field frequency). The frequency can be changed in order to ensure an optimal effect on various rotary playback (VCR) and imaging (television receiver) equipment.

In another embodiment, the cellular structure is located on the front site line blanking interval, i.e., without replacing any of the actual plot of the video signal. This somewhat reduces the number of small signals, however, at least part of the desired effect still remains, and the resulting signal contains all the videos, but this option is not suitable for all standards NTSC.

There is no need to cellular structure was present on each field.

Modification of the signal frame rate.

The above detailed description relates to a line of image information; modification of the video signal and the subsequent effect of this modification is the horizontal offset izabrana below.

Vertical modification has several types. In one embodiment, the group of rows from 1 to 4, in the lower section videorola, which is outside the useful area of the screen that contain alternating white or black, replacement of the active video.

In another embodiment, extinguished the last few lines of the video signal immediately before the personnel sync, as are the first few lines of the subsequent interval vertical blanking, and the original video image and the vertical synchronizing pulse is replaced by a high signal (as, for example, medium-gray, which is approximately 30% of the peak white, or a valid peak white) or low (in the range from black to level damping), as shown at position 87 in Fig. 1b, 2b and described above.

This vertical modification at normal mode, the viewer is not visible, as modified, only those lines of active video, which are located in region 9, outside the useful area of the screen, at the bottom of the image in Fig. 1b. In addition, the modified line will be in a similar location to the point of switching the head, if one considers the video cassette video in the switching points of the head and after it.

As is well known, in the video signal standard NTSC (or other standards) each of the first three lines of the vertical interval blanking includes two equalizing pulse, and each of the following lines contains two broad HR clock.

In normal mode vertical reverse begins shortly after the first of these personnel sync.

In Fig. 5a shows a first variant of the vertical modification. (Line numbers here refer to the second field of a frame of video NTSC). In lines 517, 518, 519 parts of the active video signal is replaced by the peak white signal (nominal 1.0); the same is done in lines 523, 524, 525. In rows 520, 521, 522 active video signal is replaced by the signal-black (value 0). Instead of groups of three row groups can be selected from among the rows from 0 to 5 or more, and the signals of black and white can be amplitude modulated or switched. Thus, in the last few lines of each field structure consisting of signals of white and black, dynamically changing between fields.

In the second embodiment, the vertical modification (Fig. 5b) extinguished the last two active line of the video signal (for example, line 524, and 525) in the video signal and the it section 9 of the television image outside the useful area of the screen (Fig. 1b). It then generates a video medium grey (30% of the peak white) and put into these five repaid lines on a periodic basis. When the signal-to medium-gray is missing (indicated by the vertical arrows on lines 524,..., 3), these off-line "misleading" schema framing of most television receivers that perform vertical reverse at the beginning of the first of these five lines, instead of do it right, in five lines, at the beginning of the vertical synchronizing pulses. Thus, the vertical reverse occurs ahead of five lines. When these five lines are signals medium-grey, reverse vertical stroke is initiated in the right place normal human pulse. It is clear that the number of such redeemed lines and the amplitude of the injected pulses in different versions may vary.

As shown in Fig. 5b, lines 4 - 6 (shown only rows 1 - 4) as well as line 517 at 523, are strings of the standard signal. The modification applies only to lines 524, 525, 1, 2 and 3, the active videocasts lines 524, 525 and the corresponding parts of lines 1 - 3 absorption (black), or they contain the entered signal menichini amplitude, associated with the known method of copy protection).

In Fig. 5b shows the plot of the field with a level of medium-gray. As mentioned above, the gray signal is switched on and off ("oscillate") with a frequency usually between 1 and 10 Hz. If oscillatory with a frequency of 1 Hz for 30 consecutive fields of video signal blanking level on five lines followed by 30 consecutive fields of video signal with a level of 30% gray on five lines of Fig. 5b.

As shown in Fig. 5b, the color burst pulses on lines 524 - 3 can be suppressed (or not).

This oscillation leads to the fact that once in the second image in five lines "jumps" up and down (frequency). Discovered that such oscillations, Fig. 3b they are marked "x" are very annoying to the viewer. That is, beyond the fields, where there is a vertical modification of Fig. 5b and vertical reverse beam is five lines earlier, followed by the fields, where the vertical reverse beam is normal. Premature vertical reverse beam is because the amplitude of the composite is reduced, for example, up to a maximum of 0.4 In (peak white to the top of the clock) from the standard NTSC in 1.0 because of the presence of known receiver then interprets the first of five repaid rows as the first human (wide) clock pulse, and so soon is reversed vertically.

In another embodiment, the vertical modification (not shown) instead of the last two lines of one field and the first three lines of the next field, which is modified, as shown in Fig. 5b, the modification affects the last five lines (lines 521, 522, 523, 524, 525) active video signal of one field, not an "illegal" (non-standard) video.

A variant of this vertical modification consists in the displacement of approximately 3 or more rows, such as rows 524, 525 and others Fig. 5b, in-line after HR clock (i.e., lines 22 to 24).

In some television receivers it causes more "jumping" because television receiver "sees" two personnel sync: one at the right time, i.e. at line 4, and one approximately on the line 23.

It is clear that the vertical modification must not access all active videocasts horizontal line. It is established that for the generation of premature vertical flyback enough to modification came about 1/2 the length of the active video line.

In yet another embodiment, verteran line blanking on lines 517, 518, 519, 523, 524, 525, where are added to the pulses of white. So (as in Fig. 5b), it is also "illegal" non-standard video signal, but which can be used for many broadcast applications. Solving linear damping on these lines increases the rate reduction gain AGC (AGC circuits cassette recorders). The white pulses on lines 517, 518, 519 and 523, 524, 525 may be present on each field or modulated or switched amplitude. Moreover, these terms with the white pulses can change the situation by a few lines from field to field, or in some way to multiply the frequency of the field, leading to the effect of vertical blur when you are not allowed to copy or it is viewed on a television receiver.

Group white pulses may include from zero to four lines.

Vertical modifications do not affect the signal when they are served on a television monitor as part of original (authorized) signal. However, if the amplitude of the signal is sufficiently reduced, for example, using the method of anticooperative, television installation will tend to misperception and the LASS="ptx2">

In addition, if a vertically modified signal is applied to the cassette recorder with signal method anticooperative, which leads to the decrease of the amplitude of the video signal during recording on the VCR while recording will cause a system failure of the speed control drum of the VCR video heads.

This is because usually VCR requires a "clean" signal frame synchronization in order to maintain the correct phase, so the jitter of the signal frame synchronization leads to disruption of synchronization VCR.

When playing a recording, then the visible image is manifested in the vertical instability of the image and intermittent noise bars that appear because of violation of the synchronization system speed control drum heads. (This is analogous to a nonconstant error tracking).

In other words, modification of the HR frequency signal performs the same function as the modification of the line frequency signal, except that instead of horizontal distortions arise vertical distortion.

The oscillation frequency pulse staffing signals increases the efficiency for a larger number of television receivers, i.e., the frequency is changed, for example, between 2 and 10 Hz over a period of about 20 C. the Oscillation frequency of the cells will also lead to the formation of small gaps that go back and forth and further degrade the image when removed not allowed up.

Device for horizontal and vertical versions.

In Fig. 6a in the form of a block diagram showing the electrical circuit for the introduction of the above lowercase and human modifications.

The main path video signal includes an amplifier with a commit level A1; schema narrowing of pulse 96; point offset 98, which are added to the wave components of the horizontal cells and the signals of the vertical modification (causing jitter); and an output amplifier-shaper-line A2.

In this case, the input video signal in the circuit of Fig. 6a may also have the last 9 lines of each field, suppressed to a reference level. In U.S. patent N 4695901 shows a switching circuit for damping.

Chain management process and generating the signal includes the allocation of the sync pulse 100; a control circuit to Galu; and system selection switch 104 (Fig. 6a), which serves the required signal voltage when the control by the control circuit 102. (Note that in the drawings the labelling of certain elements, for example U1, R1, OS1, A1, if possible, repeated for certain components. They are not intended to represent the same component, unless it clearly is not specified).

The input video signal is restored to the permanent component of the amplifier input signal with fixation of level A1. (The amplifier A1 is an industry made element, for example, Elantec EL 2090). The amplifier A1 is designed for video (with damping) have been known for a given level of the permanent component before adding it to this video any additional signal component.

The video signal resulting from the recovery of the permanent component is supplied to the point of mixing with the internal resistance of the source R0usually greater than 1000 Ohms. Incremental pulse signals, which must be entered, are served at the point of mixing signals 98 with an internal resistance of the source is less than 50 Ohms.

When you want modesa in point of mixing with the low internal resistance of the source, which does not accept the input signal from amplifier A1 and effectively replaces the input video signal for requiring the signal.

If the input signal must remain unchanged, all the switching elements 104 are in an open state. As a result, the video signal unchanged passes to the output amplifier-shaper-line A2. Resulting in the offset point 98, the video signal is supplied to the amplifier-shaper-line A2 to provide a standard level of the output signal and the output resistance. The output signal from RF amplifier with fixation level A1 is fed to the allocation of clock 100 (a widely used element, for example, a National Semiconductor LM 1881). The allocation of clock 100 provides for the formation of the full (complex) word clock signal and identification signal frame, which are required for schema management process 102.

The management scheme process 102 generates control signals for the switches of the selection signal 104 at the exact time (and require a period of time) so that different signals were replaced by the input signal.

All of the various signals, which should replace the original (input) signal, SOS"high" signal cells this is the level of medium-gray, usually about 30% of the peak white; "low" signal cells is the black level or the level of damping. These levels of different signals are generated (see Fig. 6b) with a potentiometer VR1VR2VR3VR4that provide adjustment of the signal levels (or in another embodiment from the resistors of the voltage divider to obtain a fixed set of signal levels) and connected through the respective power rail.

This signal is applied to the corresponding elements of the circuit selection switch respectively 104-1, 104-2, 104-3, 104-4, through operational amplifiers A5 gain of the unit to provide the required low output resistance (impedance) at the point of mixing signal 98.

The control circuit 102 generates the appropriate control pulses of the circuit selection switch for generating signals checkered patterns and signals vertical modification (see Fig. 6a). Pulses checkered patterns are only on the selected row, for example cellular structure begins on 10-th line containing the image information (i.e., after the end of vertical blanking) and ends on line 10 before the last page is to be placed). Similarly, the signal modification of the vertical shake is served only on the selected row, for example, in the last nine rows before the interval vertical blanking. Therefore, the signals of the cellular structure of the signals and vertical modifications require control signals to components of the line frequency and framerates.

The input video signal "video input" (see Fig. 6c, showing in detail the circuit of figure 6a) is buffered by amplifier A3 and is associated with the allocation of clock pulses via an isolating capacitor C1 and the low pass filter comprising resistor R1 and capacitor C2.

The allocation of clock 100 provides for the formation of the full (complex) of clock pulses and a rectangular frame identification signals. Full (complex) word clock signal fed to the phase synchronization circuit (PLL) 110. The adjustment phase ("phase DHL.") PLL 110, is made using the potentiometer VR6and configured so that the output pulses of line frequency started at the required start point (location) cells, typically 2 μs before the beginning of the line blanking (Fig. 7a).

The output signal of the PLL 110 is used for receiving the lower frequency component of fis adelene clock 100 is inverted through inverter U5, which provides for the formation of the locking pulse amplifier with fixation level A1 (item number EL 2090).

Rectangular output identification signal frame ("HR pulse") with a scheme of allocation of the clock 100 is fed to single shot circuit OS1 to generate pulse recognition frame a duration of approximately 1 μs. This single-shot output signal fVis used to obtain HR (vertical) frequency component signals checkered patterns and vertical modification.

Horizontal frequency component of the phase synchronization circuit fHwith PLL 100 is supplied to the synchronization input of the address counter of the memory cell 114. Single-shot output signal HR (vertical) frequency fVis input to the reset signal RS of the counter 114.

Output signals of the address counter of the memory cell 114 is served in the storage device 116, typically EPROM programmed in such a way that one of the outputs of a data bus provides a possible cellular signal pulse (CPE), which have a high level within the portion of the period of the image must be present when the signal checkered patterns.

The second output is the rock, at the end of each field that should be included signals vertical modification.

Horizontal frequency component of the phase synchronization circuit fHalso served on the single shot circuit OS2, which generates a pulse end-of-line (ELP) required pulse duration checkered patterns, typically 2 μs (see Fig. 7a).

The output signal of the phase diagram synchronization horizontal frequency fHalso served on another single shot circuit OS3, forming an output pulse of approximately 13 ISS. The output signal of the single-shot circuit OS3 to run another single shot circuit OS4, which generates an output pulse VJP approximately 52 microseconds. Time (appearance) and the pulse duration VJP determine the position of the signal caller vertical modification, within the time-line; i.e., the pulse VJP, essentially, gets to the required section period active horizontal line.

Four signal ELP, VJP, CPE and EFI generate the required control signals for the switches of the selection signal 104-1,..., 104-4 (see Fig. 6b). The pulse end of the line ELP is supplied to the divider circuit 122 to obtain the required frequency, which determines the frequency of the plaid height of the image. This frequency can be selected within a wide range; the ratio of the divider 52 (n = 52) provides a suitable result.

The output signal of the divider 122 is fed directly to one input of Tregubova logic element And U4.

The inverted output signal of the divider 122 is fed to a corresponding input of the second Tregubova logic element And U5.

The output section of the divider 122 may be a circuit of the generator sweep consisting of a pair of circuits NE 566.

One chip NE 566 is set nominally at a frequency of 300 Hz, and the other is set at 1 Hz. The output circuits NE 566 1 Hz supply input frequency control circuits NE 566 300 Hz.

On two other input trehshipovyh logical elements, U4, U5 are possible signal pulse checkered patterns (CPE) and the signal pulse line (ELP). As a result, the output Tregubova logic element And U4 formed a control signal cellular structure of high level (UVJ), and the output Tregubova logic element And U5 formed a control signal cellular structure of the low level (LHJ).

A similar scheme generates the required signals to the 555 or NE 566) collected by the circuit for operation at low frequencies, usually between DC and 10 Hz.

The generator 126 may be configured for generating the output signal with a high logic level. Similarly, the output signal frequency from DC to 10 Hz can swing in this frequency range, in order to disrupt as much as possible the number of television receivers during playback is not permitted copies.

This can be done as described above using a pair of chips NE 566.

The output signal generator 126 is fed to one input Tregubova logic element And U2. The inverted output signal generator 126 is fed to a corresponding input of the second Tregubova logic element And U3. Additionally, each television receiver can "resonate" or tremble more on characteristic frequencies, the swinging frequency generator 126 provides a broad coverage of different television receivers.

The signal designated vertical jitter (VJP) and the identification signal of the end of the field (EFI) (and the signal modified EFI flicker generator 130 and therefore marked EFI') served on two other input trehshipovyh logic elements And U2, U3.

As a result, at the output of trewhela Tregubova logic element And U3 is formed by a low control signal vertical jitter (EFCL).

It is clear that with suitable modifications of the above-described device will be added to form a vertical or horizontal modification after normal uppercase and HR signals, i.e., to add vertical modifications on lines 22 - 24 television signal NTSC, in such a manner as to cause the reverse.

Scheme from figure 6b together with the scheme of flicker generator 130 using EFI' generates numerous patterns of vertical signal modification.

In Fig. 6b shows the generator 130, exciting flapping fields or frames (flicker generator) used in some embodiments of the invention for the modification of the horizontal and vertical versions.

This flicker leads to the following effects:

1) Change the "polarity", i.e. the inversion of the gray rectangles on the black rectangles in the cellular structure with a frequency that is a multiple of the field frequency with some specific multiplier; this will result, for example, that in a weakened signal from an unauthorized copy will alternate cell displacement, further worsening visibility copies.

2) Change from field to field position pulses of the end of the field (verticalslider oscillating up/down motion blur as each field is false critical synchronizing pulse has a time different position. This situation occurs, for example, if:

pulse EFI high on lines 255 - 257, and

pulse EFI 1 high on lines 258 and 260, and

pulse EFI 2 high on lines 261 and 262 and 1, and

pulse EFI 3 high on lines 21 - 23.

In Fig. 8 shows a diagram of the flicker generator 130 from figure 6b it is shown that these four pulse are combined using a multiplexer U10 (i.e., CD 4052) when the field frequency is due to the EPROM U8 (item number 27C16 or 2716).

As a result, false personnel sync appear in different positions depending on the field. In a simple example, EFI, EFI 1, EFI 2, 3 EFI are stepped, one by one on the field.

As a result, during playback is not permitted copies of the false vertical sync pulses appear on lines 256 or 259 or 262, or 22 in successive fields or frames.

As a result, the image flickers due to changing the position of the vertical sync frequency of the field in a television receiver or cassette recorder. EPROM U8 provides agility, where various impulses the end of the field must be in the form of a function of time is I with frequency, the multiple frequency fields with some specific multiplier. The pulses of the vertical synchronization synchronize an 8-bit counter U7 (divides by 256, item number 74HC393).

The output pulses of the counter U7 start address bus EPROM U8. The output information signal DO with EPROM is high-level to invert cellular structure through the switch SW1K, SW2K. Maneuverability signal DO c EPROM U8 allows you to give commands to invert cellular structure of the pseudo-random or periodically and, in addition, provides different blink rate (i.e. every 2 fields or every 5 fields and so on).

Data bus D1and D2EPROM U8 also excite the switch U10 of the combiner (multiplexer) (item number CD4052), similarly improving maneuverability for generating the output signal EFI'.

Another electric circuit for generating vertical and horizontal versions.

In Fig. 6b impulses the end of the field and the end of the line are interconnected to replace the video, arousing the resistance R0. If only these switches do not have a sufficiently low resistance in the on state, the video signal from the programmable input source will always be n the switch is in the on state is about 100 Ohms. Normal resistance R0about 1000 Ohms. At these values of 10% of the video signal is superimposed on the pulse of the end of the line and the end of the field. If the video goes to peak white, the pulses of the end of field and end of the line will have a minimum of about 10% peak white (100 IRE) or 10 IRE, thus, providing these additional pulses useless.

In order to overcome these possible disadvantages, in another embodiment, added incremental pulses switched to using multiple switches at the same time, shut off the source video.

As shown in Fig. 9, the high and the low state of the end of the field generated by the logical element And U23, the inputs of which serves signal generator U22 (generator with a frequency sweep from 0.1 Hz to 10 Hz) and signals VJP and EFI. The switch SW103 performs switching between high and low status, which are adjusted by means of the variable resistance RBand RArespectively.

Amplifiers A1OA, A1OB are buffer amplifiers with a gain unit. In order to prevent mutual interference between the low condition of signal EOF and pulse checkered patterns, between the switch SW103 and utter SW102A. The logical element And U23 switches the switch SW103A on the ground on all rows except the seats in the row with the signal EFO. Similarly, the logical element U21A switches the switch SW102A on the ground all the time, except the time when pulses are present checkered patterns.

On the other hand, switches SW103A and SW102A are "transparent" for EFO and pulses checkered patterns, which are formed on the input switches SW103 and SW102, respectively. The output signal of the switch SW103 is buffered by a buffer amplifier with a gain unit A100 and summed in summing amplifier A102. Similarly, the switch SW102 adopts high-and low-status end-of-line generated using signal ELP, counter U20 (divide by n single pulses) and signal CPE.

Variable resistance RCand Rpprovide the setting for the high and low pulses of the end of the line, respectively. The amplifier A101 buffers the signal from the switch SW102 in summing amplifier A102 through resistance R2. The amplifier A102 supply the summing amplifier A103. Post pseudo-sync pulse (false clock pulse following the normal sync) (PPS) is also summarized in summery the CA fields and post pseudo-sync pulse (PPS). The switch SW101 commutes all these signals using a logic element OR U10 and inverter U11 according to them time and switches the video signal throughout the rest of the time. The amplifier A104 is buffering the output signal from the switch SW101 and provides video output, video output, contains the signal with the added pulses. Switch SW104A performs pre-blanking signal from the scheme narrowing of the clock to the voltage level VBLNK (i.e. OIRE) for the last 9 active line of each television field using logic element AND U104B. Two input logic element U104B act: information output signal EFO with EPROM (which becomes high during the last 9 lines of a television field) and the signal VJP (pulse active horizontal line).

The modulation source provisions for PPS is controlled by the source voltage Vger. The source voltage Vgersupply the resistance R20 with inverted pulse signal of the color burst and the resistance R10 and the capacitor C2 for forming a variable-delay single shot scheme U20.

Single-frame circuit U20 generates a signal of a changed position after about 1.5 μs, polnia using signal CPE and logical element AND-NOT U21B. The resistance R6 determines the amplitude of the PPS. Resistance usually R6 is selected from - 10 to -20 IRE IRE.

Another entrance (U22A) logical element AND-NOT U21 in the normal state is high, so that all PPS were clocked position of the pulse with constant amplitude. If U22A pulsing (i.e., 300 Hz), then the PPS signal also turns on and off (with a frequency of 300 Hz). Thus, the PPS may be pulse modulated position, and a sync pulse, amplitude modulated pulse that follows the color burst signal.

Modification with narrowing pulse horizontal sync

Diagram of the sync pulse narrowing and method for improving the copy protection signal is used alone or together (as shown in Fig. 6a, block 96) with any other of the above-described method of the modification signal, described below in more detail.

The reason for narrowing sync (synchronization signals) signal (mainly pulses of horizontal synchronization) is that when you are not allowed to copy a weak signal with reduced width (duration) of the pulse is the cause of the problems vosproizvodimost the majority of television receivers include restoration on permanent part of the top of the sync pulse. As these patterns highlight clock television receivers usually excited full impedance of the transmission channel, the sync pulses are partially restricted in amplitude. When narrowing sync they are even more limited in amplitude.

When you are not allowed a copy of the video, especially if the signal is above a modification to the cellular structure and/or modification of the end of the field, the copy has a reduced amplitude video signal with the reduced width of the sync pulse. As a result, the allocation of the synchronization signal in a television receiver "sees" significant losses in pulse associated with self-limiting amplitude due to the narrowed width of the sync pulse and the associated weakening of the signal. Therefore, the allocation of the synchronization signal of the television receiver does not "remove" the correct clock pulse, and this leads to the fact that the TV picture becomes even worse, because the effects of horizontal and/or human modifications manifest themselves more strongly.

In Fig. 10 shows a typical known scheme of sync, which is used in many television receivers. This scheme S="ptx2">

The top of the clock signal to charge the capacitor C it is so that the transistor is switched on only the very top of the clock.

Through the resistance Rinthe transistor is served such a bias voltage that the vertices of sync "cut off". Voltage Rwiththrough C is associated with resistance Rorunning resistance of the signal. The greater the resistance Rothe more limited the amplitude of the sync pulse, as can be seen, at Vin.

If the resistance Rotoo large, the transistor Q1 will start cutting the sync pulse in the video signal (blanking level), since the value of Vcdoes not rise to the average level at which the transistor cuts off the sync pulse just below the top of the inverted clock signal.

Insufficient charging of the capacitor allows transistor Q1 to turn on, even when the signal level of damping. When the transistor Q1 is on, the resistance of the primary emitter is low. (This leads to a weakening of the positive going clock). Since the capacity charge is a function of the width of the synchronization pulse, narrowing of the clock pulses of the clock pulse normal width. This is tantamount to cutting of a sync pulse at the point closest to the signal (i.e., the blanking level of the video signal).

When the normal level of the video narrowed sync pulses do not cause problems when playing back a copy on a cassette recorder or a television receiver. But when narrowed sync recorded not permitted copies, cassette, copy-protected, the video signal is attenuated. This weakening along with the narrowed sync pulses leads to the fact that the television receiver (during repeated viewings) does not emit the correct clock pulses and the synchronization is violated parts of the video signal, i.e., the level of damping.

If selectively constrict certain lowercase sync to a value close to zero pulse width (duration less than 600 NS), so that the filter in the allocation of clock pulses in a television receiver or tape recorder does not respond to him, or so that the decoupling capacitor circuit, the selection of the sync charging slightly, then this is equivalent to the fact that in this area there is no synchronizing pulse. These narrowed selected lowercase sync near the end of the field can create Taku who works a copy as if forming a new (false) human impulse.

If the video is not permitted copies with weak video signal is supplied to a television receiver, in this case on a cassette recorder or a television receiver will see two personnel of the pulse on the same field, which can lead to vertical jitters.

In one embodiment, the pulse (modulation) frequency end of the string field of the video signal (the ends of the field lines, with the amplitude from 0 IRE to at least 10 IRE, have narrowed the pulses of the horizontal synchronization) swinging from the range of 1 to 15 Hz. This simultaneously leads to the required effect for a large number of different television receivers.

In Fig. 11a shows the form of the video signal (Vin); this signal is inverted in the allocation of synchronizing pulses of the television receiver with figures 10 and supplied to the resistance Ro(where Ro0) figure 10.

In Fig. 11b shows the influence of the coupling capacitor and the resistance R3. Note that at Vinvideo sloping rises to the level of the top of the sync pulse. (This is a result of available time constant of the RC-chains is defined lowercase sync. The action of the resistance Ro(where Ronow the resistance of the transmission channel, i.e., 200 - 1500 Ohms), a capacitor C, a resistance Rband transistor Q1 leads to the restriction on the amplitude of the peaks of the narrowed sync.

Since the width of each pulse is narrowed, the capacitor C is charged enough, and this leads to a further limitation of the amplitude.

Recall that the charging of the capacitor C is affected and the amplitude of the sync pulse, and the width of the sync pulse, i.e., Vcproportion (width of the sync pulse) multiplied by (the amplitude of the sync pulse). The lower the voltage Vcthe more a limitation of the sync pulse amplitude.

In Fig. 11 shows this result in the point corresponding to Vbin Fig. 10.

In Fig. 11e shows a weak signal of the video with is not permitted copies when narrowed the clock, where "a" denotes the existence of pulses checkered patterns. The scheme of selection signals responds by completely cutting off the clock and, as a result, part of the video at the end of the line is interpreted as a new sync. This is shown in Fig. 11f. The scheme of selection signals (inverter) vkluchila video the front of the clock becomes unstable. This jitter of the signals received via the scheme of allocation of the pulses leads to unstable image on the screen of a television receiver (i.e., jumping from side to side). As shown by the arrows, due to the narrowing of pulses or impulses checkered patterns result from unstable pulses of horizontal synchronization.

In Fig. 11h shows the output signal would be obtained with the scheme of allocation of synchronizing pulses of the television receiver for the figure 11d, which is a television signal full level with narrowed sync pulses. Thus, the signal shown in Fig. 11d, does not create problems when playing on a television receiver. Only if the signal shown in Fig. 11d, is added to the signal copy protection and is not permitted to copy, then the problem with playback on a television receiver becomes obvious, as it is not permitted to copy gives a weak signal.

In Fig. 11i shows the full not obstructed television signal, which, if selected row near the end videorola or after HR clock (i.e., lines 256-259 NTSC and rows 10-12 NTSC), narrowed with izmenenie">

The transistor circuit selection clock Q1 will form the buildup to the amplitude of the slice in the image area, i.e., the "zz" in Fig. 11j. This leads to the broadening of the pulse in the "zz", but not enough to cause the pulse horizontal sync.

In Fig. 11k shows the output signal of the circuit clock selection for the waveform of figure 11j. If this signal must be together with the signals of the copy protection, you are not permitted copies for the allocation of signals to the television receiver will be weakened signal, as in Fig. 11l.

In Fig. 11l shows weak TV signal, which is obtained because of the "illegal" copy narrowed when the pulses are at the end of the field lines.

In Fig. 11m shows the effect of increasing the in point of Vbbecause of the resistance Rband a capacitor C. the Corresponding output of the circuit selection clock shows in the "y" is a new (false) broadened pulse (frame synchronization). This new false vertical synchronizing pulse generated when the narrowed pulses of horizontal synchronization are at the level of damping at the end of the string field.

If the narrowed pulses line with the em only a narrow horizontal sync frequency, and no new broadened pulses. This is because the allocation of the clock is not fully respond to the levels from 10 to 100 IRE.

When the switching signal with a level of more than 10 IRE units or the blanking signal selection scheme sync "sees" a normal human pace, sometimes accompanied by false or premature or delayed HR clock (see Fig. 11n). These false premature and/or delayed vertical synchronizing pulses then cause the jitters up and down when playing is not permitted copies.

In some cases, to obtain the same effect as described above can be achieved by:

narrowing the selected clock to almost zero, i.e., removing the pulses of horizontal synchronization, so that the allocation of signals to the television receiver formed a false vertical synchronizing pulses;

changing the position of multiple pulses is greater than 63.5 μs, so that the allocation of sync "was wrong" and formed a new false vertical synchronizing pulses. This is due to the effect of increasing the generated some allocation patterns of pulses is which does not contain a false vertical synchronizing pulses, due to the fact that the video signal has a level higher than the level of damping, i.e., more than 10 IRE units in the field narrowed pulses. Thus, if the video signal level is high enough relative to the blanking level, with the narrowed lower clock cannot generate a false vertical synchronizing pulses.

As shown in Fig. 12a, in the scheme of narrowing of the clock input signal (possibly already bearing the main impulses of copy protection) is fed to the input 160, where he served on the allocation of clock 162 and also to the adder signal 164. Schema selection clock 162 selected signals horizontal sync (HSingh) and frame synchronization are served in the schema (logical) selector line 166, which selects, for example, lines 10 to 250 each videopal. The selected pulses H sync also served on the single shot circuit OS 10, which in response produces a signal with duration of 2 μs for the logical element And U12. To another input of logic element with sector 166 is supplied to the selected signal line that indicates the selected line from 10 to 250.

In response to the output of the logic element And U12 a signal is generated representing a signal from the scaling amplifier 174 is summed again with the original video signal in the adder 164, and the output signal from the adder 164 is supplied to the video output 180.

In Fig. 12b is shown in the waveform at the point Q from figure 12a (normal signal H sync with the color burst signal) and the signal R, which is the output signal of the scaling amplifier 174. The result of the sum of Q and R ("video output" in the lower part of the figure 12b) is visible on the output signal 180. It is a shortened pulse H synchronization with the color burst signal.

The following describes another execution scheme narrowing of sync with the extended (long) envelope of the color burst signal (extended color burst signal necessary to ensure synchronization of color television receivers, if narrowed H sync create a problem with the color sync).

In Fig. 13a, 13b shows the electrical scheme for the introduction of narrow pulses of the horizontal synchronization in the active field of the video signal. Within this active field information output EPROM determines which rows next to be narrowing. For example, this output signal EPROM (EPD1) may allow for rows 20-250 be replaced by the width of the synchronizing pulse of 3.7 μs, and for rows 251-262 them the programming EPD1 in EPROM U9. In addition, another output signal from the EPROM U9 can lead to darkening of the sync pulse on the line (i.e., lines 255 and/or 257 or so, before the pulses EFO (this is done by using the logical element And U10 and signal EPD2 with EPROM U9.). Shifted in the horizontal position narrowed the sync pulse is also possible as soon as blanking pulse at nominal HBI.

The input video signal that carries any combination of : signals primary form of copy protection pulses the end of the field and pulses checkered patterns, or normal video signal type RS 170 is a clock pulse, the restored DC component using RF amplifier A1 to 0B (equal to the blanking level). The amplifier A1 generates a signal for schema selection clock U2, which in turn generates a complex output (full) clock pulse and HR pulse between 1 and 20 μs. When generating the pulse color synchronization in order to synchronize the color burst signal of the input video signal with the scheme 2015, it is necessary to take into account that the momentum of the color synchronization should not be generated when there are pulses of false synchronization (i.e., if the input video signal and jny) clock pulse and generates no re-run the pulse duration of 45 μs, long enough to ignore the equalizing pulses and personnel 2H pulses in the vertical interval blanking, and false pulses which may be present (usually in the first 32 ISS TV lines 10-20). Single shot circuit U10 holds the front of the synchronizing pulse of the video input signal at 5 μs and triggers the single shot circuit U11, 2 ISS, single-shot signal coincides with the color burst signal of the input video.

The amplifier A1 excites band-pass filter of a color signal of the amplifier 91 to the input signal in the phase diagram synchronization of the color synchronization circuit 2105. The output signal of the PLL circuit 2105 is now a color subcarriers in the form of a continuous wave that is synchronized in phase with the color burst signal of the input video.

The PLL circuit adjusts 2011 updated phase color subcarrier so that it was correct at the output of the amplifier A5.

HR clock pulse from clock selection U2 returns to its original state counter U8 address for the EPROM U9. Signal counter U8 incrementally increases with pulse line frequency coming from the amplifier A3.

Each line of the POM field.

One of the advantages of the circuits shown in Fig. 13a and 13b, is that the regenerated narrowed sync can be entered anywhere in the interval linear damping (HBI). This becomes especially valuable advantage, if the new narrowed sync can start for 1 µs up to lowercase sync input video signal.

If pulses of PPS and new narrowed lower clock ahead 1 μs, the horizontal instability will be greater if playback is not permitted copies with copy protection, horizontal jitter of the image will be 1 ISS more.

When priority is given to Suzanna pulse H synchronization between the narrowed pulse H sync and PPS there is greater temporal distance, in turn, this leads to a proportional increase in instability, if you are playing is not permitted to copy.

For the generation ahead of narrowed pulse H sync output signal single-shot circuit U2, representing a pulse duration of 45 μs, coinciding with the front of the clock input signal is converted into a rectangular shape using a single-shot circuit U4, formiruya obrazuetsa in a sinusoidal oscillation with a frequency of 15.734 kHz.

By adjusting the inductance L1 is formed sinusoidal oscillation, which is ahead of the H sync input video signal. The comparator A3 converts this sinusoidal oscillation in the pulse, the sections of which are front or rear front master clock input signal. For generating a signal synchronous with the input signal, the filter R1, L1, C1 (with Q equal to 4) usually has a greater opportunity to perform tracking than most lowercase PLL when the input signal comes from a VCR. The output of amplifier A3 is then fed to a single-bit scheme U5 (14 ISS) for generating clock HBI to replace the old (input) the sync pulse and the color burst signal on the new narrowed clock pulse and extended color burst signal.

Single shot circuit U6 sets the nominal delay narrowed sync, 0.5 MS from the beginning HBI input video signal front output circuit U5), and single shot circuit U7 initiates a new narrowed clock pulse.

The elements R2, R3, and Q1 form a switch for additional narrowing of the pulse by shortening the transistor Q1 (emitter to collector) and through Hemi U7 represents pulses of 3.7 μs from row 20 - 250 and a pulse duration of 2 μs from lines 251 - 262.

Initiating the rear edge of the circuit U7 is a diagram U12, the output of which is extended color burst signal (pulse width of about 5.5 ISS).

The output of the circuit U12 gate signal of the color synchronization scheme 2011 through the switch SW22, and the amplifier A4 with a bandpass filter (3.85 MHz) forms the envelope of the extended color burst signal from the output of the switch SW22, and sends a signal to summing amplifier A5 via a resistor R10, regulating the amplitude of the extended color burst signal. Narrowed pulse H synchronization circuit U7 is summed with the logical element And U13 signal EPD2, which is usually high, except for a few lines, which narrowed the sync pulse is extinguished. This leads to the amplification of pulses of the end of the field.

The output signal of the logic element U13 summed in the amplifier A5, which flows through the resistance R8 regulating the amplitude of the narrowed sync. Then at the output of amplifier A5 is formed narrowed clock pulse "plus" extended color burst signal.

The switch SW25 switches the output signal of the amplifier A5 Italia A5 during the HBI using the output signal of the circuit U5 and EPD 3 (pulses designated active field, i.e. line 20 - 262).

The buffer amplifier A22 then create an output video signal from the input signal with the new extended H-sync and extended color burst signal. For inclusion in the modified position of the sync pulse (EOFRSP) at the end of the location field, the circuit U16 generates a signal with a duration from 10 to 40 μs from the front of the synchronizing pulse of the video input signal. Logic circuit U16 associated with a logical circuit U17 forming the pulse width from 2 to 4 μs, which have a delay relative to the front of the synchronizing pulse of the video input signal from about 10 to 40 μs. The output signal of the logical circuit U16 is provided by logic element And U18 and EPD 4 of EPROM U9. Then the signal EPD 4 on specific lines in the end of the field becomes high after using EPD 2 triggers the blanking pulse.

Logic circuit U16 excites summing amplifier A5 via a resistor R85 amplitude adjustment EOFRSP. Logic circuit 16 also includes a switch SW25 during initiation EOFRSP through logical element OR for the introduction of the changed position of the sync pulse (EOFRSP).

Thus, the output signal of amplifier A2 has an input video signal, narrowed zmeneneho position constricted H-sync pulse.

The narrowed sync pulse is effective even if not all of the pulses of the horizontal synchronization signal so constricted. Found that even a relatively small number of narrowed lower clocked provide false human reversed. For example, for this purpose, suitable narrowed pulses of horizontal synchronization 3-6 consecutive lines of the video signal. Preferably narrowed pulses of horizontal synchronization group together in a coherent (or at least relatively close) lines to generate false HR flyback.

Another scheme to narrow sync pulse, in the case of a deletion signal copy protection, is described in U.S. patent N 5157510 Ron Quan, etc., and in U.S. patent N 5194965 Ron Quan and others, both patents cited as references to the source of information.

In Fig. 14a and 14b shows a block diagram of two devices for combining the above-described narrowing of sync with the previously described known method of copy protection with horizontal and vertical versions of the signal (lowercase and human modifications).

In Fig. 14a shows the first such device. Software signal is in block 204 to add cleduuschii block 206 (shown in detail in Fig. 6a) adds (1) a cellular structure and (2) modification of the HR frequency signal at the end of each of the selected fields. Then block 208 electrical circuit additionally alters the video signal by narrowing the clock (shown in detail in the various embodiments of Fig. 12a and Fig. 13a and 13b).

The output signal from the output 209 is supplied, for example, on the main duplicator VCR device copy on VHS. Found that the known primary method of copy protection is improved by the addition of receiving narrow pulses.

In another embodiment, in Fig. 14b input software video first served in the block 200 electrical circuits to narrow clock pulses and in blocks 204, 206 for introducing signals copy-protect devices, as well as the cellular structure and modification of personnel frequency signal and then applied to the output 210.

It is clear that other devices may also form the described embodiment, the video signal, i.e. a cellular structure, personnel structure of the end of the field, the narrowing of the clock pulses and others equivalent to them.

Method and electrical circuit for removing modifications of the signal, providing protection from videocapture.

Neither is which includes, at least, the AGC pulses and false pulses as described above, and/or narrowing of the pulses and/or pulses "cells" at the end of the line, and/or a false vertical synchronizing pulses at the end of the field.

As for the AGC pulses and spurious pulses in the U.S. patent N 4695901, Ryan and patent N 5157510 Quan both incorporated by reference, describes methods and devices for destruction (removal or weakening) of these added pulses. In U.S. patent N 4695901, Ryan described only the removal or weakening of false sync pulses and AGC pulses and described the destruction of narrow pulses destroying the false vertical synchronizing pulses at the end of the field or pulses (cell) at the end of the line.

As is well known in the prior art amplifiers-shapers can eliminate the restriction of sync with regenerated (updated) clocked, but the amplifier-shaper does not destroy the cell pulses at the end of the string or false vertical synchronizing pulses at the end of the field.

In the known technical solutions do not address the question of how to destroy these human and cellular signals copy-protection. Simple damping of these signals when a culture of Thailand is only the damping of these signals to the level of damping when the existence of false sync pulses, AGC will lead to the formation of a weak signal that is fed to the input in a television receiver, when the illegal copy. Then this weak signal is, for example, lines at the end of the field when the level of damping, and in this case it can lead to pulses of false framing.

This effect is particularly well-expressed, if still present narrowed pulses of horizontal synchronization.

On the other hand, if only narrowed the clock is restored to the normal width of the sync pulse, two other advanced signal providing copy protection (cellular and personnel), are still effective.

Thus, methods of destruction of the above improvements of the method anticooperative the following.

1) protection Signal from the copy at the end of the line (cellular modification) are replaced by signals with at least 20% of peak white, or signal offset level by at least 20% of peak white is added to signal the end of the line. The substitution signal is s copy. Under "site" means the portion of the pulse end of the line, which must be neutralized, or portions of all lines of the video signal, which have the pulse of the end of the line.

2) the pulses of the end of the field (personnel), providing copy protection, is replaced by a signal that is at least 20% of the peak white over a period of at least 32 μs per line; in another case, the signal offset level by at least 20% of peak white is added to recruitment pulses during at least 32 μs at a sufficient number of rows (i.e., 7 of 9, 5 of 7 2 of 3), which ensure the destruction process of copy protection.

It is clear that here the value of 20% of peak white, for personnel and cellular pulses, determined experimentally. This is the usual minimum value required to obtain the proposed effect, consisting in the destruction of the improvements of the video signal. A signal with a higher level (as, for example, 30% or more) would perform this function even better.

3) Most (50% or more) narrow pulses of horizontal synchronization expanded so as to cancel the process of narrowing of the clock, i.e., if the ECCA narrow pulses and in this case there is no need to replace narrowed clock pulse standard RS 170 pulse horizontal sync. (Note that 4.7 μs is set as the pulse width horizontal sync to the standard RS 170).

4) Advanced clock pulse, the width of which comes in the area of the pulses of the end of the line (checkered), can be used to kill and checkerboard patterns and process of narrowing the clock.

This must be done so that the retrace pulse of the television receiver still ran the color burst signal, as an extension of sync, when it includes part of the pulses of the cellular structure, can lead to premature initiation of the retrace pulse in a television receiver.

5) Lower the clock pulses and the pulses of the color burst signal with correct timing and width of the color burst signal, moved to the area of the pulses of the cellular structure, can cancel the process of narrowing clock and checkered patterns, and thus will not have a signal reverse beam in a television receiver, which would be wrong ran the signal C is Nala frame synchronization in a television receiver, if the amplitude of the signal will be reduced.

In most television receivers and cassette recorders to start the filter frame synchronization, providing at the output of human impulse, takes about 30 μs. Thus, when the modification of personnel pulses at the output of the filter frame synchronization will be no false pulses of the vertical synchronization even if there are residual false human impulses, the duration of which is less than, for example, 20 μs.

Checkered pulses are destroyed enough, if the "low" state of the pulse, the cell is shortened so that the narrowed pulse horizontal sync is not detected by the allocation of synchronizing pulses of the television receiver or VCR. This eliminates the influence of checkered patterns when playing illegal copies.

In Fig. 15 shows a two-stage scheme and the way to remove all of the above signals, providing protection copies. The video signal containing ARU, false synchronization, cellular structure, human impulses, and narrowed pulses of horizontal synchronization, first from input 228 postopia, Bukovina AGC pulses and pulses of false synchronization.

At the second stage output signal from the circuit 230 is supplied in the scheme of installation of modifications (improvements) 234. In this scheme will be cancelled cellular and human impulses, and cancelled the narrowing of the clock pulses and any residual AGC pulse or pulses false synchronization interval string damping. Thus, at the output 236 video free from all effects associated with the signal copy protection.

In this embodiment, cellular and human impulses are destroyed (ideally) by substitution of these pulses and other pulses having an amplitude of about 20% of the pulse amplitude peak white, or by adding an offset signal level having an amplitude of about 20% of peak white. Checkered pulses can be cancelled by subtracting the wide signal horizontal sync, replacing, thus, cellular impulses. When this is destroyed checkered pulses and extends the pulse horizontal sync, which leads to the cancellation of the process of narrowing the clock. And finally, if HBI (interval linear damping) is replaced by the new string sync pulse and C is one and/or the pulse of a false synchronization in the active field.

In addition, in this embodiment, the narrowing of the duration of the black-level cells and human impulses leads to the fact that the copy becomes visible. And any AGC pulses that accompany the normal pulse horizontal sync can be cancelled by adding a pulse of negative bias level to the opposite high color burst signal (pulse AGC) or by substitution of the sync pulse and the color burst signal.

Scheme for doing this is described below.

In Fig. 16 shows in detail the circuit block 234 with figure 15. Signal with improved protection against copying is introduced into the amplifier A10, which has a gain of K (i.e. K = 2). The output of amplifier A10 is connected to the capacitor C1, the diode D1 and the resistance R1, which together constitute a diagram of the recovery of the sync pulse in a constant component. The resistance R2, the capacitor C2 and the capacitor C1 form a notch filter frequency of the color subcarrier, so that the comparator A11 can properly allocate the clock.

The reference voltage Vb1sets the cutoff point. This leads to the fact that the comparator A11 functions as a selection scheme, synchronouse R3, the inductance L1 and the capacitor C3, which is a pulse framerates. The comparator A12 reference input level Vb2represents the allocation of personnel sync.

Since this signal can be from a VCR, some schemes of allocation of sync, i.e. LM1881, form a wrong recruitment pulses with the output signal from the VCR. Therefore, to generate human impulse circuit U1 generates an output pulse, which lasts a little shorter than six rows from the beginning of the first vertical synchronizing pulse.

Circuit U2 generates an output pulse having a width of about 25 μs.

Then the logical element And U7 logically "adds the output signal of the inverter U6 with the output signal of circuit U2 to generate a pulse appearing every two field or each frame. Only in one field has a high output signal from U2 and U6. The output of the logic gate U7 is a strobe signal (FID), which starts (see Fig. 17) scheme U8, having a pulse duration of 1 1/2 field. Using the D-flip-flop U9, the output signal of the circuit U8 supplied to the D-input of the trigger U9, and HR clock, podvenechnoy which coincide with the first vertical synchronizing pulse (broadened) of the incoming video.

Scheme U10-schema counter U11 and impulse line frequency with a scheme string PLL U4 generates signals on the 10 bit address bus B10, which has 525 States. EPROM U12 addressed to a 10 bit bus B10 and depending on how you programmed EPROM U12, output channels EPROM U12 carry the following signals:

1) Place the active field (AF) (high status from line 22 to line 262).

2) Place the end of the field (EOFL) (high status with a line 254 to line 262).

In Fig. 16, the PLL circuit U4 and figure 5 represents the diagram of the PLL line frequency so that the output signal of the PLL circuit U4 ahead of the front line synchronizing pulse of the video signal at approximately 3 μs. This is done using a circuit U5, which delays the output signal PLL on approximately 3 μs.

The output of the circuit U5 is fed back to the input of phase detector PLL U4. Since the fronts of the pulses at the inputs of the PLL detector U4 must be equal, then the output signal of the PLL U4 should be advancing towards the front of the clock amplifier (comparator) A11. PLL U4 does not respond to any pulses that are not pulses of line frequency. Thus, personnel and other pulses PLL U4 does not respond.

Moreover, the circuit U3 generates impul A11.

In Fig. 18 shows a diagram of a level shifter that provides cellular destruction and human impulses. Amplifiers A20, A21 form a summing amplifier. This summing amplifier signals: the signal via a resistor R100, the pulses of the end of the line via a resistor R101 and the pulses of the end of the field via a resistor R102.

When using advanced line pulse (ANR), which starts at the same time as each of the pulses of the cellular structure, the pulse duration of 1.5 μs synchronizes ANR, using the active AF area of the EPROM U12. The logical element And U13 generates a logic high pulse (EOLD) at the end of each line during the active field. This pulse from the logic element U13 is then added to the signal. This leads to the fact that the pulses checkered patterns never hit the level of damping. Instead of blanking level now cellular pulses have a minimum of 20% of peak white. Thus cancelled the effect of cellular impulses the end of a line, as if weakened signal level of the cell pulses does not fall in the signal low enough to cause "random" starting the scheme of allocation of sync.

Pulses EOFL EPROM U12 send a signal with a high logic level at the end of the field during the horizontal active line via the logical element U150. This high logic level output of logic element U150 is then added to the video signal via a resistor R102 to human impulses had the minimum level of 20% of peak white.

In conditions where human impulses have a level of at least 20% of peak white, and the signal is weak, these new lines at the end of the field will not cause a false frame synchronization. Then the output signal of the amplifier A21 contains mechanisms cancellation cellular pulses and pulses the end of the field.

In order to cancel the process of narrowing clock, the output of the amplifier A21 is supplied to the capacitor C12, the capacitor C13, the diode D10, the diode D11 and the resistance R12 to the stop is equal to 0 V at a constant component at the level of damping.

Using again ANR, single (single shot) scheme U17 and frame (single shot) scheme U18 generate new advanced clock pulse. Elements R17 C18, C3, C19, R18 and R19 are the low-pass filter for pulse with a finite rise time of the front. Voltage Vb3select this to set the level of damping for the "high" state of new advanced sync. Single shot circuit U19 and U20 together with the logical element And U21 form a logical control circuit for re-introduction of the new extended pulse horizontal sync during the active field. The output signals of the circuits U19 and U20 have a slight delay relative to the signals from circuits U17 and U18, given the delay in the low-frequency filter comprising the elements of: R17 C18, L3 and so on, Thus, the electronic switch SW1 switches advanced clock pulse, and the output signal enters the amplifier A23. The plot of figure 18 with the right hand, limited dashed line represents circuitry substitution of clock pulses and generate an output signal S50.

In Fig. 19 shows a diagram, which is used in conjunction with the circuit of Fig. 16 to replace the cell pulses on the new extended and the new advanced pulses of horizontal synchronization. In addition, the pulse staffing modifications destroyed by the shear layer using source EOFD (figure 18) in the resistor R412 and R411.

The input video signal is fed to the bandpass filter of a color signal, comprising the elements of: R299, C400, L400 and C401, and later in the regenerator of the color burst signal U40 (item number SA), which is the regenerator of the color burst signal for continuous wave subcarrier (to 3.58 MHz) crystal Y 40 - crystal by 3.58 MHz.

The output signal regenerator of the color burst signal U40 is filtered using a bandpass filter (to 3.58 MHz, which includes the elements: R300, L401 and C402) and is buffered by amplifier A40. Electronic switch SW40 introduces a new color burst signal using a single-shot circuit U43.

Circuit U43 runs back-to-back regenerated advanced sync pulse from the circuit U41. Scheme U40 generates a delay of 0.5 MS to establish the time interval between the front site line sync pulse and pulse front color synchronization. The regenerated clock pulse from the output of the circuit U41 filtered and shifted in level by means of the elements: R307, L403, C404, R305, R306 and voltage V400.

Increase is encoded with the color burst signal by using the resistance R304 and amplifier A43. Electronic switch SW41 during active field introduces a new advanced clock pulse and a new color burst signal during the HBI (using logic gate And source of the AF signal from the EPROM U12). (New extended sync and new color burst signals also destroy any signals, providing protection signal from the copy, with AGC pulses active field in HBI, i.e. pulses with raised rear sites). The amplifier A44 buffers and generates a new signal with destroyed signals anticooperative, including narrowed sync pulses checkered patterns, human impulses.

In Fig. 20 shows a diagram for a "level shifter" by multiplying the non-zero voltage to a higher voltage. Invalidation signal the end of the line EOLD and invalidation signal the end of the field EOFD used for the level shifter of Fig. 16, generate a control voltage to increase the gain of the amplifier (VCA) U50, voltage-controlled (item number MS), during the existence of the pulses checkered patterns and impulses of human modification in the signal is copy-protected. Video restored DC component so that h and HR modification correspond to the level above S (usually from 0.3 to 0.5 (B).

Elements C201, R201, D10, D20, C200, R200 and A49 form this restored DC component of the video signal. Then the output VCA U50, a signal is generated, copy-protected, having shifted level, or an amplified signal whose level is also above the level of damping in order to destroy improvements, providing protection copies. The amplifier A50 buffers the output signal of the VCA U50 schema reductive destruction of the sync pulse in Fig. 16.

In Fig. 21, 22 and 23 shows other options for destruction of signals anticooperative cellular structure and personnel using the switching circuits.

In Fig. 21 shows that (for a video signal, the restored DC component, see Fig. 16) during the pulse checkered patterns and vertical (HR) pulse control voltage corresponding to these pulses, commute (while control signals EOLD and EOFD) signal V10with 20% of peak white, replacement anticapella pulses by means of electronic switches SW199 and SW198. To implement this allows end made video signal resistance (resistor R200, providing a total resistance of about 2000 Ohms). Then the signal is amplified by the amplifier A is Paeth at the output 506.

In Fig. 22 and 23 shows a switching circuit for destruction pulses checkered patterns and human impulses, which differs from the circuit of Fig. 21. (Circuit of clock pulses and output, S50, Fig. 22, 23 are not shown, but they are presented in Fig. 21).

In Fig. 22 input video signal, the restored DC component, again, is fed via a resistor R201 in the amplifier A54, with replacement switches SW198, SW199 in the management of, respectively, the pulses EOLD and EOFD commute voltage V1, V2, each of which is a DC signal or an AC bias DC current, and the magnitude of the signals is greater than or equal to 20% of peak white.

The diagram in Fig. 23 is similar to the circuit of Fig. 22, except that the switches SW198, SW199 are consistently directly on the transmission channel of video signal and to attenuate pulses checkered patterns and impulses the end of the field is normal tool for replacement of pulses. In some cases, to destroy the effects of pulses checkered patterns and pulses EOF affecting the visibility of copy can be quite simple blanking pulses checkered patterns and pulses EOF (level Gah by increasing clock

In Fig. 24a shows a diagram for a video signal is copy-protected, lower case (cell) (EOL) and human (EOF) modifications, provided at the input of the buffer amplifier A60 to cell destruction and human modifications through expansion of sync.

The output signal from amplifier A60 comes in a selection scheme U16 clock. Full input signal from the circuit selection clock U61 is served on the single shot circuit U64 to resolve in full sync 2H pulses. The output signal from the circuit U64 served in the generator PLL U65. Frequency PLL U65 for N = 910 is 14.31818 MHz and is equal to N multiplied by the frequency of horizontal lines When used for the synchronization input of the counter U68 and fHto enter the transition to its original condition, EPROM U69 receives from the counter U68 11-bit address bus. Now EPROM U69 can generate output inline elements image (as programmed in the EPROM U69). Output signals EPROM U69 contain lowercase synchronization for:

place of leading a false clock,

space expansion clock,

new pulse signal color burst,

places of false sync for EOF pulses.

leads in the initial state, the counter U63, having 525 States. The counter States U63 max TWAIN synchronizes (it) pulses of line frequency using the PLL U65 and dividing by N counter U67. Then EPROM U66 has horizontal lines within the active TV field. For example, in EPROM U66, D0= row 22 - 253 and D1= line 254 - 262, the position of the pulses HR modification.

Please refer to Fig. 24b, logic U610 - U614 use the output information signal EPROM U69 and U66 for the following purposes:

1) Position of leading to a false clock pulses and the position of the expansion of clock signals are passed through to DO leading false clock pulses and the expanding clock (H) in order to be on the lines 22 - 253. This is done at the output of the logical circuit U613.

2) Expansion of sync only on lines 254 - 262 plus added a false sync only on lines 254 - 262; this is done at the output of the logical circuit U612. The logical element OR U614 combines the output signals of the logic circuits U612 and U613 and compares them "OR") with D3H, new color burst signal. The output signal of the logic element U614 controls the switch SW600 for the introduction:

leading a false clock (with the 3) Signal a new impetus to the color burst signal from the signal D3H, and impulse active field D3 injected signal fscCW using A65 amplifier and logic element And U615. The output of logic element U615 represents the color subcarriers, which is available only when the signals D3H, and D3 high. A variable resistor R607 sets the new level of the color burst signal, and the capacitor C607, inductance L607 and resistance R604 are the filter envelope of the new color burst signal. U616 comprising advancing a false pulses false sync, enhanced clock, and sends a signal to the inverting summing amplifier with resistance R602 and R603 regulating the amplitude. Then summing amplifier A67 has: leading a false sync, extended H sync pulses of the new color burst signal and a false synchronizing pulses, and switch SW205 switches the output signal of the amplifier A67 at the appropriate times.

In Fig. 25a - 25 shows waveforms, which are indicated at various points in the circuit shown in Fig. 24a, 24b.

In Fig. 24c shows a typical PLL circuit for the generator U65 shown in Fig. 24a containing warstory LC oscillator 252 phase detec, and the DC amplifier 250, which includes the A70 amplifier and corresponding elements R702, C703, R703, R704, and the reference voltage Vbb.

Another way of cellular destruction and human transformation.

Another scheme for cancellation pulses cellular structure and personnel of the pulses shown in Fig. 26, where as the switch SW100 has a low resistance, in essence, impulses checkered patterns and impulses of human modification weakened and/or have shifted the level or substituted on the voltage, which is the average voltage through the switching circuit averaging 260) conditions high and low pulses of the end of the line (cellular structure) and pulses the end of the field (HR option). For example, if the pulses of the cellular structure and staffing modifications have high status 30 IRE and low status OIRE, the capacitor C1 will be charged to approximately the voltage

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Because the switch SW100 is turned on while the pulse of the cells at the end of the line and during the pulses of the end of the field due to the logical element U304, during these periods of time the voltage of the capacitor C1 replaces the input video signal to a signal level approximately g 26 modified signal protection signal from the copy served on the input amplifier A1, the output of which is fed to the circuit selection signals 258, which are formed human impulses of short duration (i.e. 10 ISS) for the circuit 260, the address counter of the memory cells. In this case the full signal (including, perhaps, a false synchronizing pulses arising from known primary form of copy protection) is supplied to the phase synchronization circuit (PLL) U303. Then the output signal of the PLL 303 is an impulse line frequency, which starts in about 2 µs up to the front, the quenching pulse of the input signal. EPROM circuit 260 has output signals that correlate with the provisions of rows checkered pulses and pulses the end of the field on the television field.

Single shot circuit U100 generates a pulse coincident with the position of the cells within a single row, and single shot circuit U200 and U300 form the pulse such that the output of the circuit U300 contains a pulse coincident with the end of the field pulses within a horizontal line. The position of the pulses of the cells and the end of the field is passed through logic U202 and U203 and are using logic element OR U304 dednam the video.

The switch SW103 is included within these matching periods for attenuation using resistance RS and averaging (using capacitor C1) signals, providing enhanced copy protection.

As a result, the amplifier A2 is formed over the visible signal.

Another way to destroy signal protection is to switch either one or both schemes limit the negative peak and positive peak level during a time period when there are pulses checkered patterns (EOL) and impulses HR modification (EOF), as shown in Fig. 27. The input video signal is copy-protected, limited in amplitude by a buffer amplifier A6. The provisions of the EOF and EOL are defined using the schema and put into logical element OR U305. Diode D1 limits the positive amplitude (top) pulse checkered patterns of gray (high) and pulses high gray HR modification to obtain a copy. Diode D2 limits the negative amplitude (bottom) of the pulses of the black level (low) EOL and EOF to the gray level, in order to receive the copied record, using switches SW101, SW102. Amplifier A7 buffers result the persons of destruction is to recognize the impulses checkered patterns and impulses of human modification and add inverted pulses. Because the cellular structure moves up or/and down and impulses of human modifications to make passes up and down the diagram shown in Fig. 28, detects and cancels the pulses EOF and EOL (zeroes).

Although convergence to zero can be less effective, because the pulses of the cellular structure and the end of the field reduced to approximately the level of damping (OIRE), convergence to zero in some cases can lead to improving the visibility of the image. Recall that in the ideal case, the pulses of the cellular structure and the end of the field should be about 20 IRE for the complete destruction). Thus, the reduction to zero leads to the fact that the state of Hi (high) and Lo(low) pulse checkered patterns and the end of the field go into the low state (0 IRE).

In Fig. 28 shows a diagram of information to zero. The video signal from the output of the amplifier A1 in Fig. 26, recovered by subscription, in order to have a level of damping of about 0V, using elements C15, D15, Vb15, R15 and A246 is supplied to the switch SW124 which transmits pulses of the cellular structure and the end of the field using the Boolean" use logic U202 and U203 in Fig. 26. The inverter A82 inverts the signal from the switch SW124 and adds this inverted pulse cells/end of the field with resistance R2 again to the incoming video signal (via a resistor R1) to reduce to zero the pulse of the cells and the end of the field. (Resistance R1 and R2 have the same value).

The amplifier A209 buffer this signal with the "reset" pulses checkered patterns and the end of the field. (Resistance Rbprovides the bias voltage for constant current on the ground for inverting amplifier A82).

Another way of destruction (used against pulses EOL and EOF) is to weaken the peak of the active video signal from 100% to 80% (about 20%), as well as the increase of the amplitude of pulses (about 50%), as shown in Fig. 29a and 29b, which presents waveforms. This requires an increase in full sync, 40 IRE to about 60 IRE.

In this case, can be also destroyed the false synchronizing pulses, which are described in U.S. patent 4631603, because the pulses of false synchronization is 40 IRE. If a full sync long, schema selection of clock pulses tend to select only big with roomfuls plus pulse AGC) will not be recognized.

In Fig. 29a shows the original form of the input signal for one videotrace.

In Fig. 29b shows the waveform of videotrace modified for pulse checkered patterns and vertical modification.

In Fig. 29b shows the resulting waveform with videoslinnie the pulses with amplitude should be approximately 50% higher than for the standard signal in the presence of pulses of the cells and the end of the field. Because full sync large, then remove illegal copies will usually be enough to ensure that the pulses of the cellular structure and the end of the field resulted in any effect when viewed illegal copies.

As any HR clock pulses are modified so that they were much more selection scheme synchronizing pulses of the television receiver or VCR will not run incorrectly.

In Fig. 30 shows a diagram, which ensures the formation of a waveform, which is shown in Fig. 29b. Signals with improved copy protection are fed to the input of the amplifier A84 by a factor of 0.8. These input signals are also limited in amplitude and have the blanking level of 0 is no analog switch SW210 and the attenuator 300. Diagram of the attenuator 300 weakens the usual logical level full sync pulse (i.e., 5V peak to peak) and using offset voltage - V. the output circuit of the attenuator 300 is formed of regenerated clock pulse levels from 60 IRE (OIRE 0) to -60 IRE. Then the switch (circuit breaker SW210 skips this new regenerated clock pulse on the output, where the amplifier A505 formed waveform similar to that shown in Fig. 29b.

Another way to destruction, as shown in the diagram of Fig. 31, is the tracking and blocking line of active video in order to replace the cell pulse to the last value of the active signal before pulse EOL.

Using the scheme in Fig. 31 output signal A1 and the output signal U202 from the diagram in Fig. 26, you can cancel cells by tracking and locking.

This method is similar to re-enable the known voltage during the time interval corresponding cell impulses. Since most of the software materials have a level of about 0 IRE (especially in NTSC, where the black level is 7.5 IRE), tracking and blocking of the signal leads to the production level is UEMOA cell.

The amplifier A90 receives the output signal from amplifier A1 in Fig. 26. The amplifier A90 has a delay of 100 to 200 NS (using delay lines or low-pass filter) so that the pulse from the logic circuit U202 monitors and blocks the signal from 100 to 200 NS immediately before the pulses checkered patterns. The switch 310 is closed all the time and is open during the time the cell pulses. Thus, the output of the amplifier A92, essentially, is a video signal that has undergone before-break switch, and capacitor C107 is filled within 2 μs latest software image element (level greater than approximately 7.75 IRE).

Another way to destruction, as shown in the waveforms shown in Fig. 32a, 32b, is that the pulses EOF and EOL added high-frequency signal, so as to effectively shift the level of the average DC component of the high-frequency signal.

In Fig. 32a, above, shows the form of the input video signal includes a pulse EOF, and below, a high-frequency signal of the level shift, has a frequency of from 0.1 to 5 MHz. The lower waveform of figure 32a can also be added to the cell pulses (for example, at a frequency of 3 MHz). Received the part, the appropriate frequency of 3 MHz. Extension high-frequency signal causes the cassette recorder perceives only the average level of the permanent component, shifting, as a result, the high and low state pulses EOF and/or EOL so that they become ineffective.

Because the above-described modification also depends on the circuitry of the television receiver, as shown in Fig. 33, these "antimodification" (vacating) circuit 322 can be connected between the reproducing cassette recorder 322 TV receiver 324 in order to get the best image quality with illegal videotapes, using, if necessary, RF modulator 326.

The pulses prior synchronization, destroying lowercase and human modification.

The following describes, as a replacement for a wider than normal sync (i.e., normal pulses with a duration of 4.7 μs for a wider pulses lasting from 6 to 10 μs) adversely affects the pulse line modification (cellular structure) (end of line) and HR modification (end of field), respectively.

In allocation patterns singogo clock charge dividing capacitor C to the input of the differential allocation of sync. The threshold cutoff is a function of the average charge time for a television line. The longer the charge, the further the point of the "slice" is the level of damping. In addition, since the cutoff point is shifted to the level of damping due to the resistance Rband the capacitor C, the sync pulse preceding the pulses of the end of the line, causing the slope, which slowly subsides, in order to avoid the limitations of the pulse top and bottom during the pulses of the end of the line or impulses the end of the field.

In Fig. 34a shows the circuit response selection pulses of a television receiver, a television signal (represented by an inverted signal), which includes the main method anticooperative from U.S. patent N 4631603 plus modification, providing antimirova due to the cellular structure. The edge of the sliced signal from the television circuit clock selection is clearly falling in region "A" (the area of the cellular structure) and, consequently, leads to the excitation/no excitation pulses premature synchronization that, as a result, causes the image of the television receiver appearance of the cellular structure.

In Fig. 34b shows the signal form, poluchasa is in the area of cell "A", and, therefore, the television receiver in this case does not perceive a cellular structure. The momentum of the color burst signal can be optionally added to the "CBX" through the line sync pulse in order to provide a color synchronization of a television receiver or VCR.

In Fig. 35a, 35b shown, respectively, in line clock pulse signal, normal, and extended line clock pulse with regenerated (updated) the color burst signal (CB), added to the second half of the extended sync pulse and the color burst signal, is added after the trailing edge of this extended pulse horizontal sync. Added the regenerated color burst pulse provides the color synchronization in a television receiver, regardless of whether from the front or rear of the front of the sync pulse starts the color burst signal in a television receiver.

The regenerated color burst pulse is not needed in place of clock HR modification because it occurs at the bottom of the television field, which is usually invisible.

When adding clock pulses and pulses premature synchronization decoupling capacitor in the allocation of synchronizing pulses of the television receiver is charged to a greater magnitude. Therefore, the edges of the cut signal circuit selection clock moves further from the level of damping without affecting the pulse end-of-line and end of the field.

In Fig. 34c shows a waveform with added premature sync; the edge of the slice signal 331 schema selection of clock pulses of a television receiver or VCR does not fall into place the end of the line. Similar results are shown for pulses personnel to modification by the introduction of false sync pulses of Fig. 36c.

In Fig. 36a shows the impulse HR modification "B" with a normal width H sync pulse and the edge of the sliced signal selection scheme synchronizing pulses of the television receiver 336. Note that the edge of the slice 336 schema selection of synchronizing pulses of the television receiver comes into the region of the pulse staffing modifications B.

In Fig. 36b shows the corresponding waveform with advanced sync pulse, and the edge of the slice 338 schema selection clock teleology modifications).

Lowercase versions with additional pulses post-synchronization.

In Fig. 37 shows a diagram for adding pulses false post-synchronization, in order to improve the effectiveness of copy protection (i.e. further degrade the visibility of the image), if you have an illegal copy of the above main method of copy protection from the U.S. patent 4631603.

The video signal from the main method of copy protection and other above videosmaniaki is input to the resistance R9. The amplifier A1 is buffering the input signal through the capacitor C1 flows into the allocation of clock U6. Output HR clock pulse from the circuit selection clock is input to 12-bit (clock) counter U1, "translation in the initial state (reset)". Counter U1 synchronized with lower clocked from PLL U2, which is synchronized with the full sync. EPROM U3 selects which rows can appear false post-sync (PPS).

To select EPROM U3 can be used pseudo-random distribution of false post-sync. Signal DO (output signal EPROM U3) blocks, thus, the single shot circuit OS3. The signal color is satrom C2 and resistance R2. Voltage Vgeradded to the signal (i.e. the signal is a triangular shape with a frequency of 300 Hz) in the capacitor C2. This leads to a time-varying threshold drop in the circuit OS3 and, thus, to change position.

The output signal of the circuit OS3 is a fixed pulse (i.e., with a duration of 1.5 MS) with a modulation of the position of the pulse, for example, 1 μs. The output signal of the circuit OS3 reduces any video level blanking switch SW1 and adds using variable resistance R7 pulse for generating a false post-sync.

Summing amplifier A3 inverts the pulse output circuit OS3 in order to maintain proper form added false post-sync.

In Fig. 38a-38e shows waveforms at various points of the circuit shown in Fig. 37, which are indicated. The amplitude of the false post-sync can be amplitude modulated with Vgen2and amplifier A41, voltage-controlled, which is the power of multiplication. The output signal of the amplifier A41 varies in amplitude in accordance with Vgen2and when the false post-sync pulse is missing, the amplitude is equal to B. O

Device is provided another scheme destruction for use with the video signal "video", containing the above-described pulses false post-synchronization (PPS), served on the selection scheme pulses U1 through a capacitor C1. That is, the diagram in Fig. 39a reduces or eliminates the effect of the PPS pulse, thanks to this video can be recorded. From the scheme of allocation of sync U1 full clock pulse enters the scheme lowercase phase synchronization U2. The output signal from the H PLL U2 synchronized in phase so that starts in the area of impulse false post-synchronization (after the color burst signal). Single shot circuit U5 runs H PLL U2 to generate a pulse, which contains the impulse false post-synchronization. HR clock pulse from clock selection U1 starts the allocation of clock U4 to generate a pulse from the area outside of the working field of a television receiver, from lines 4 to 21, and the circuit U4 starts the circuit U5 to generate a pulse of active fields from rows 22 - 262. The output signal of the circuit U5 (which is the complement of the interval HR damping) gates the logical element And U10 so that the output signal of the logic element U10 appears only during the active field of a television signal.

Thus, the output signal SS="ptx2">

In Fig. 39b, 39c, 39d shows the indicated signals for three points in the diagram of figure 39a.

In Fig. 40a shows the output signal of the logic element U10 figure 39a used for cancellation pulses false post-synchronization by generating a pulse (PPSD), coinciding with the PPS signal, and shift level using an analog multiplier U6 (item number 1494). The multiplier U6 increases or decreases the gain in the course of time, when there is a pulse, leaving the false post-synchronization, the output of U10. When the signal VID1 is supplied to the multiplier U6, the top of the sync pulse if VID1 is O B. When increasing the gain at the right time, the result is a Z-shaped signal, as shown in Fig. 40b. When used in the multiplier U6 signal VID2 instead of VID1 and using the output signal of the logic element U10 multiplier U6 is rebuilt so as to weaken the output signal U10 with a positive going pulse, and the gain decreases at the right time in order to obtain a Y-shaped signal, as shown in Fig. 40c cancelling a method of copy protection.

When using signal VID2 analog switch SW220 scheme shall contain the reference voltage.

If VR is O B, then X-shaped signal with figures 40e result in the cancellation of the false post-synchronization. If VR is equal to the voltage peaks of the sync pulse (i.e., -40 IRE), then the result is a U-shaped waveform, as in Fig. 40f, which creates additional momentum H sync with fixed amplitude and position. This leads to the fact that in most television receivers arises static horizontal offset of the invention and no wolnoobraznosti" that occurs in other cases because of false pulses post-synchronization.

By summing the output signal U10 in the amplifier A6 in the circuit of Fig. 40g is offset level for the destruction of the false pulse post-synchronization. The waveform of the signal for this case is also shown in Fig. 40h. The signal in Fig. 40h determines the position of the PPS and the offset level.

In conclusion, narrowing pulse false post-synchronization for cancelling effect is accomplished by limiting the sync pulse amplitude. As shown in Fig. 41a, the amplifier A7 receives the signal VID2 color subcarrier without rejectee due to the notch filter R100, inductor L100 and capacitor C100. The output from the SUB>bb2
approximately -10 IRE.

When using logical element And U7 and PPS with a logic circuit U10 (Fig. 39a) at the output of logic gate U7 is formed impulse, which is inverted, but has logic levels similar to the initial impulse false post-synchronization. The output signal of the circuit U8 lasts more than 90% of the pulse period of the false post-synchronization, and then he controls the switch SW224 so that the front of the false post-sync was cut by more than 90%.

In Fig. 41b shows that the resulting signal in the Video output DD has a very narrow false post-clock pulse, so that it does not cause any response in any video equipment (i.e., a cassette recorder or a television receiver). In addition, the summation of the output signal of the logic element U7 (Fig. 41a) in the amplifier A6 in Fig. 40g through resistance R6 leads, resulting in the formation of the output signal, which is a false post-sync with the level-shifted, as seen in Fig. 40h. This method can partially or completely destroy the amplitude of the false post-sync, resulting in a weakened false post-sync.

Method and ustroystvo and device in which the signals associated with the method of anticooperative consisting of added pulses (as described above) false synchronization and AGC (i.e., due to the main method of anticooperative), is effectively reduced without changing these added pulses.

In contrast to the above previous methods, in which the added pulses were changed by loosening the amplitude level offset or narrow pulses to destroy the influence of the added pulses, in this way to reduce the influence of the added pulses by further adding other pulses, which counteracts the decrease in gain caused by the AGC pulses and false sync.

In U.S. patent 4631603 describes how the AGC circuit in the tape recorder changes the amplitude of the incoming signal using the sampling clock and the rear site line blanking interval. Adding additional pulses with a very high level rear site line blanking interval decreases gain. Since the AGC circuit in the recorder continuously counts the amplitude of the clock (by sampling Singh is by moving all rear pads from blanking level below the level of damping (i.e., -20 IRE units for video NTSC).

Under this method you can also add more the false synchronizing pulses in the lower part of the television field (end of field), which are not present anticapella pulses containing the AGC pulses and false sync. These "additional" false synchronization pulse followed by a pulse below the level of damping.

Please refer to Fig. 42a; the main copy-protected video ("video") served in the allocation of clock (item number LM 1881 or equivalent). Full (complex) clock pulse from clock selection U2 starts back cut of the single shot pulse circuit U3, forming a pulse duration of 3 μs.

HR clock pulse from clock selection U2 triggers the single shot circuits U4 and U5 for forming pulse active field is applied to the input of logic element And U1, which "adds" impulse active field and the output signal of circuit U3. Then the output signal of the logic element U1 is a pulse with a duration of the back pad 3 ISS during the active TV field. (In another embodiment, circuits U4 and U5 are not necessary, and the output C is negative summing resistance, which subtracts the level of the rear quenching pulse of the input signal. The input amplifier AO buffers input video signal and transmits it to the capacitor C3, diode D1, the resistance R3, which voltage Vbform a plan to restore a permanent part of the top of the sync pulse. The output signal of the amplifier with feedback A3 is supplied to the resistance R7; this output signal has a lower back pad quenching pulse. (See figures 43a - 43g, showing the signals at various locations in Fig. 42a, in accordance with designations).

The diagram shown in Fig. 42b receives the video signal output (video out 1) of the resistance R7 of the circuit of Fig. 42a and replaces the last 10 or 11 rows of each television field on television lines containing false sync, coupled with the subsequent AGC pulses below the level of damping, i.e., -10 IRE - -30 IRE. The video signal from the branching points of the diode circuit 1 in Fig. 42a contains a signal that is restored by subscription to O to O IPE level of damping. The amplifier A2 in Fig. 42b amplifies this signal and supplies it to the generator horizontal synchronization U11 (using the contact 1 of the generator CA 31541, where the top of the sync pulse is ihade a signal is generated with a frequency of approximately 503 kHz. This output signal 503 kHz is amplified to logic level by means of the amplifier A3 is fed to a binary divider U10.

Summing amplifier A4 generates a signal of rectangular shape, approximately 2 μs included and 2 ISS is turned off, the amplitude of -20 IRE -40 IRE. Voltage Vbband the resistance R9 sets the corresponding bias voltage constant current, and resistance R10 and R11 set the appropriate amplitude.

In Fig. 42a single shot circuit U6 generates a pulse active line duration 32 μs from the start of the active horizontal line; circuits U7 and U8 are triggered by the vertical sync pulse in the last 11 lines of the active TV field. The logical element And U9 in Fig. 42b, therefore, introduces a rectangular signal with duration of 4 μs with a level of from -20 IRE -40 IRE over the last 11 horizontal active lines of a television field (where usually are not false sync pulses and AGC pulses). The amplifier A5 and the resistance R12 derive a modified Actinopterygii signal containing pulses damping with low rear deck and new false pulses and reduced negative pulses ARU.

Modified videosigle produces an incorrect measurement. Measurements of false sync ( and low back area quenching pulse), coupled with AGC pulses reduced level, cassette recorder "believes" that there is a low signal level, and therefore, cassette recorder increases the gain of your amplifier AGC. This leads to a shift of the reduction of the gain in the AGC amplifier VCR, which is connected with the main method of anticooperative.

In one embodiment, the added false sync level damping (O IRE) lasting at least 2 μs for the rear cut each added false sync pulse in order to cancel EOF (HR) modification. This is done using a switch or circuit, which in various embodiments described above. This is useful if high status EOF modification has an amplitude of more than 10 to 20 IRE.

In the absence of the level of damping in these conditions, the influence EOF modifications may be reduced, but the influence of known main method anticooperative increases, thus increasing EOL modification and preventing the destruction of the way anticooperative disclosure of the invention for any a person skilled in the art other obvious modifications in accordance with the invention and means, that they fall within the scope of the applied claims.

1. The modification of the video signal subjected to copy protection, to provide improved protection against copying, in which the unmodified signal copy protection causes the recording of the video signal of reduced amplitude on a copy, characterized in that exercise blanking area of the video signal in place of part of the sweep signal outside the normal size of the raster, before synchronization signal and adding repaid in place of the signal to indicate reverse videolock before the advent of the synchronization signal.

2. The method according to p. 1, characterized in that the step of adding adds the signal only in parts of the video signal having an active video area before clearing.

3. The method according to p. 1, characterized in that the step of adding adds the signal during the active video signal and for at least the plot line blanking interval of the selected lines of the video signal.

4. The method according to p. 1, wherein the signal includes a negative-going transition, located in part of the sweep signal, visible on the monitor outside the normal rasmesihla.

6. The method according to p. 4, characterized in that the transition occurs in many consecutive lines of the video signal, determining a black rectangle in the video signal displayed on the monitor, followed by a set of consecutive lines without such transitions, the set of rectangles that define the structure in one video.

7. The method according to p. 6, characterized in that it further shift crossings in consecutive lines, leading consequently to the vertical offset of checkered patterns with the view of the modified signal on a television monitor.

8. The method according to p. 7, characterized in that the shift of the crossing locations with a frequency greater than about three to five times the field frequency of the video.

9. The method according to p. 6, characterized in that at least some rows without such transitions have each transition from active video signal to a gray level, and the transition is in the line before the signal horizontal sync.

10. The method according to p. 1, characterized in that the signal is added to part of the sweep signal outside the normal size of the raster.

11. The method according to p. 9, characterized in that it further Jahoda from the level of the active video signal to the level of grayscale and invert the line, with the transition from active video signal to the level of gray in the previous field, rather than allocating a black box, and inversion occurs with a frequency that is a multiple of the field frequency of the video.

12. The method according to p. 1, characterized in that the synchronization signal is a vertical synchronizing signal, and the signal is a signal of this type, which indicates the vertical reverse beam.

13. The method according to p. 1, characterized in that the add signal at least in the last two lines of active video in the field of copy-protected video signal on the lower part of the field, and the signal is a signal of this type, which causes vertical reverse beam in a television receiver until zone of the vertical synchronizing signal.

14. The method according to p. 13, characterized in that it further modify the provisions of the added signal in serial videopath.

15. The method according to p. 14, characterized in that the position of the signal change incrementally on a preset number of rows in each successive field.

16. The method according to p. 13, characterized in that it further substituted specified signal Myung-the signal is injected in at least two lines at the end of the field video.

18. The method according to p. 1, characterized in that the step of blanking provide damping only the active video.

19. The method according to p. 1, characterized in that it further generate a set of pulses having an amplitude below the level of the blanking signal, and add at least one from a set of generated pulses in the selected active videotrace video signal, each incremental pulse is the pulse horizontal sync and precedes the beginning of the active videocasts one of the selected videotron.

20. The method according to p. 19, wherein the selected active videotrace choose a pseudo-random.

21. The modification of the video signal subjected to copy protection, to provide improved protection against copying, in which the unmodified signal copy protection causes the recording of the video signal of reduced amplitude on a copy, characterized in that provide a signal of some sort to indicate reverse videolock and substitute this signal in at least one horizontal line of the video signal in place before synchronization signal instead of the active video signal is stored in that location in the other case

22. The modification of the video signal subjected to copy protection, to provide improved protection against copying, in which the unmodified signal copy protection causes the recording of the video signal of reduced amplitude on a copy, characterized in that provide protection signal from the copy to indicate the reverse videolock and substitute this signal in at least one horizontal line of the video signal in place following the synchronization signal of the video signal.

23. The method according to p. 22, wherein the step of providing a signal to impose a structure of alternating areas of black and gray in the part of the sweep is active videocasts field of the video signal outside the normal size of the raster, and shift the location of the rectangles in successive fields, causing the moving displacement in the displayed video.

24. Device for modifying the video signal subjected to copy protection, to provide improved copy protection when playing back a copy-protected signal from a backup when an unmodified copy protection causes the recording signal of reduced amplitude on a copy, atrichum synchronization part of the sweep signal, beyond the normal size of the raster, a pulse generator for generating a preset signal and summation scheme for summing the generated signal with the suppressed part of the video.

25. The device according to p. 24, characterized in that the circuit damping absorbs at least a section of each of the last few lines of active video in the selected video and the fact that the signal is a video signal of gray level, and the fact that the summation scheme operates so as to perform the summation in the sequence videopolis, followed by a sequence videopolis, in which the generated signal is not added.

26. The device according to p. 25, characterized in that the circuit damping absorbs as well as the generated signal is summed at least with a plot of each of the first few lines, following the impulses of alignment and vertical synchronizing interval of personnel extinguish immediately following selected videopoem.

27. The device according to p. 24, characterized in that the circuit damping absorbs as well as the generated signal is summed with at least part of the interval of the horizontal blanking specified lines of video signal.

28. Uki video copy-protected in place in front of the signal line synchronization in this line, and the scan signal outside the normal size of the raster, and the pulse generator generates a signal which is a negative going transition at least to the black level of the video signal.

29. The device according to p. 24, characterized in that the circuit summation adds the generated signals in several successive lines of the video signal, thereby emit a black rectangle, followed by a set of consecutive rows entered in them the signal of gray level, and several black and grey rectangles define a cellular structure in the video.

30. Device for modifying the video signal subjected to copy protection, for enhanced copy protection, where improved copy protection causes the recording of the video signal of reduced amplitude on a copy, characterized in that it contains a control circuit for determining the phase of active video signal in place before synchronization signal in part of the sweep signal, visible on the monitor outside the normal raster size, g is the specific portion of the active video signal, moreover, this signal increases the deterioration of the image of the copied signal.

31. A way to improve the copy protection video signal having a number of rows in each field, while at the beginning of each row has a pulse horizontal sync, and at the beginning of each field pulse field sync, and the video signal is subjected to the process of protection, which reduces the amplitude in the copy of the video signal, wherein the selected at least some of the pulses of the horizontal synchronization signal and reduce the duration of the selected pulse horizontal sync, causing that at least one false pulse field synchronization when a copy of the video.

32. The method according to p. 31, characterized in that the step of reducing the pulse duration generating pulses, each of which has a duration less than the duration of each of the selected pulses of horizontal synchronization, each of the generated pulse has a value of amplitude, but opposite in polarity and essentially equal to the absolute value of the amplitude of pulses of the horizontal synchronization, and add at least one of the generated pulses A the duration of each of the selected pulses of horizontal synchronization.

33. The method according to p. 31, wherein the duration of each of the selected pulses of the horizontal synchronization after the stage of reduction is less than 600 NS.

34. The method according to p. 31, wherein the duration of each of the selected pulses of the horizontal synchronization after the stage of reduction such that the allocation of synchronizing pulses of the television receiver filters out the pulses of the horizontal synchronization and does not respond to selected pulses of horizontal synchronization.

35. The method according to p. 31, characterized in that the duration after the stage of reduction is approximately zero.

36. The method according to p. 31, wherein the selected line begins essentially with the tenth line and reach at least one line at the end of each videorola video.

37. The method according to p. 31, characterized in that it further adds further impetus horizontal synchronization signal in at least one line at the end of each videorola, destroying at least one of the first synchronization signals.

38. The method according to p. 31, wherein the step of decreasing generate pulses having a duration less than the inverse value of the amplitude with respect to the selected pulses of the horizontal synchronization and add at least one of the generated pulses in the video signal in place of one of the selected pulses of horizontal synchronization, thus effectively reducing the duration of each of the selected pulses.

39. The method according to p. 31, wherein the video signal includes a color burst signal following each pulse horizontal sync, and the fact that increase the duration of the color burst signal in each selected line.

40. The method according to p. 31, characterized in that the step of reducing replace the pulse horizontal sync pulse reduced duration.

41. A device for narrowing the pulses of the horizontal synchronization signal having pulses of horizontal synchronization at the beginning of each line and the pulse field synchronization at the beginning of each field, characterized in that it contains the allocation of the clock pulses to provide indications of the pulses of line and field synchronization signal, the circuit select line responsive to the provided instructions for selecting particular rows in each field of the video signal single-shot circuit for generating a signal of a given length less than the length of impul is to add the generated signals to each of the selected special strings in place of the pulse horizontal sync in each selected row, thus reducing the pulse duration of the horizontal synchronization in this line.

42. How to disable pulses copy protection. added to the video signal, and the pulses of copy protection are the kind that cause reverse motion of videolock at the moment does not coincide with the advent of the synchronization signal, and are active videocassette video signal, wherein generating the signal of a given level and add this signal to the video signal at the above-mentioned active videocasette.

43. The method according to p. 42, wherein the predetermined level is at least 20% of the peak white signal.

44. The method according to p. 42, characterized in that the synchronization signal is a signal horizontal sync.

45. The method according to p. 42, characterized in that the synchronization signal is a vertical synchronizing signal.

46. The output of the system is improved pulses copy protection added to the video signal, and superior pulses copy protection belong to this type, which cause reverse motion of videolock at the moment does not coincide with the advent of the synchronization signal, and nahodyashimisya copy protection generated signal.

47. The method according to p. 46, wherein the specified level is at least 20% of the peak white signal.

48. The method according to p. 46, characterized in that the synchronization signal is a signal horizontal sync.

49. The method according to p. 46, characterized in that the synchronization signal is a vertical synchronizing signal.

50. The output of system protection schemes videocapture, which reduces the pulse duration of the horizontal synchronization, thus causing a false pulse field synchronization signal, when it is recording, characterized in that the determined location of at least some of the pulses of the horizontal synchronization with reduced duration, and modifying the pulses of the horizontal synchronization by increasing their duration.

51. The method according to p. 50, characterized in that the increased duration less than the duration of the standard pulse horizontal sync.

52. The method according to p. 51, characterized in that the phase transformations generate the pulse horizontal sync, perform the blanking pulse horizontal sync reduced duration and BBO="ptx2">

53. The method according to p. 52, wherein the generated pulses of the horizontal synchronization are of such length that they come in the closest active videocasts line.

54. A device for disabling pulses anticooperative present in the active videocaster video signal, and the pulses anticooperative are at the end of at least several videopolis and in the end at least several videotron in their active videocaster, characterized in that it contains the schema of the recovery clock to restore the peaks of the pulses of the horizontal synchronization signal to a specified level, the circuit for generating control signals of the first predetermined duration at the end of at least a few lines of the video signal and the second predetermined duration at the end of at least several fields of the video signal and circuit switching, controlled by control pulses, for switching a particular level of signal in the recovered video signal, thus ensuring the implementation of its acceptable entries.

55. The device according to p. 54, wherein the specific signal level is at least 20% of the peak white level vastano, added to active videocassette video before synchronization signals, characterized in that it contains the logic for generating control signals specified duration within the active videocalls and circuit excited by these control pulses, to enable the specified signal in the active videocasts, thus ensuring compliance with acceptable video recording, and leaving the device reduces the deterioration of the image caused by the pulses anticooperative added to the active videocassette video before synchronization signals, the copied signal after playback.

57. The device according to p. 56, wherein the logic circuit generates the control signals in the time immediately before the occurrence intervals of the string and personnel blanking signal.

58. The device according to p. 57, wherein the predetermined signal is at least 20% of the peak white level of the video signal.

59. The device according to p. 57, characterized in that it further comprises a recovery scheme to recover the video signal to a given level of the peaks of the pulses of the horizontal synchronization, moreover, is a device for p. 56, characterized in that the circuit excited by control pulses includes at least one switching circuit.

61. The device according to p. 57, characterized in that the circuit excited by control pulses, includes a signal generator with level-shifted pulse.

62. The device according to p. 57, characterized in that the circuit excited by control pulses, replaces active videocasts for a given duration at a given signal.

63. The device according to p. 56, characterized in that the circuit excited by control pulses, additionally generates pulses of line blanking interval and replaces the line blanking interval, following at least one of the active videocalls, to the generated pulses of the line blanking interval.

64. The device according to p. 56, characterized in that the circuit excited by control pulses includes at least one multi-pole switch for adding the given signal, and the multi-pole switch in one position passes the unmodified video signal source and the second position commutes specified signal and turns off the video signal source.

65. The device DL is crucial modification involves reducing the duration of at least some of the pulses of the horizontal synchronization signal so that to their duration was less than the standard duration, characterized in that it contains logic to determine where line blanking interval at least in some lines of the video signal and generating a control signal in response, the pulse generator for generating pulse horizontal sync a specific duration and a switching circuit for adding the generated pulse horizontal synchronization signal, thereby switching circuits perform the addition in response to the control signal.

66. The device according to p. 65, characterized in that the duration of the generated pulse horizontal sync less than the standard duration.

67. The device according to p. 65, characterized in that the pulse generator also generates a color burst signal, and switching circuitry adds the generated color burst signal in the video signal.

68. Device for decommissioning antiepidemic improved pulse-by-level offset antiepidemic superior pulses present in the active videocaster video, and anticapella superior pulses are at the end at meali control signal at the beginning of antiepidemic pulses at the end of at least several videotron, a pulse generator for generating a pulse having a particular level above the level of the video signal at the end of each videotrace in response to the control signal and means for adding the generated pulse to the signal, increasing the level of the end of each videotrace.

69. The device according to p. 68, characterized in that it further comprises a second timing circuit to generate a second control signal at the end of each videotrace, a second pulse generator for generating a second pulse having a particular level above the blanking level of the video signal in response to the second control signal and means for adding the generated second pulse to the signal, increasing the level of each videotrace.

70. The device according to p. 68, characterized in that it further comprises a generator for generating pulse horizontal sync, having a greater duration than the horizontal sync pulse is present in the video signal in other cases, and the switch for replacement of pulses of horizontal synchronization present in the video signal in other cases, the generated pulses of horizontal synchronization.

71. The device according to p. urovnya signal of the video signal on special value.

72. How to disable superior pulses copy protection added to the video signal, with improved pulses copy protection are the kind that cause reverse motion of videolock at the moment does not coincide with the appearance of the signal videosynchnization, and are in active videocassette video signal, wherein determining the location of the signal videosynchnization, generate a pulse with an amplitude essentially equal to the signal amplitude of videosynchnization, and add the generated pulse to the video signal immediately before the appearance of the signal videosynchnization, thus invalidating the impact of improved pulses copy protection.

73. The method according to p. 72, characterized in that the signal videosynchnization is a signal horizontal sync.

74. The method according to p. 72, characterized in that the signal videosynchnization is a vertical synchronizing signal.

75. The method according to p. 72, wherein the added pulse in combination with the vertical synchronizing signal is a signal of the sawtooth form.

76. The method according to p. 73, characterized in that it further adds a color burst signal to rasshireniya the efficiency of the method or media copy protection moreover, this method and device are the kind that cause reverse motion of videolock at the moment does not coincide with the appearance of the signal videosynchnization, and is active in videocassette video, and includes the addition of pulses to the level below the level of the blanking signal, and the added pulses are selected horizontal videostream video signal between the pulse horizontal sync and about the beginning of the active video in each videotrace, wherein generating the control signal in places added pulses, and weaken the added pulses in response to these control signals.

78. The method according to p. 77, wherein the step of weakening provide damping of the added pulses.

79. The method according to p. 77, wherein the step of weakening carry out the reduction of the duration of the added pulses.

80. The method according to p. 77, wherein the step of weakening provide increased levels of added pulses relative to the blanking level.

81. The method according to p. 77, wherein the step of weakening carry out the reduction of the amplitude of the added pulses.

8 the relative pulse horizontal sync in each horizontal videotrace.

83. The method according to p. 79, wherein the step of weakening generate a high-frequency signal and adds the generated high-frequency signal to the video.

84. The output device is down or reduce the efficiency of the method or device of copy protection, and this method and device are the kind that cause reverse motion of videolock at the moment does not coincide with the appearance of the signal videosynchnization in the video signal, and is active in videocassette video, and includes the added pulses with a level below the level of the blanking signal, and the added pulses are selected horizontal videostream video signal between the pulse horizontal sync and start of active video in each videotrace, characterized in that it contains logic for generating control signals in places added pulses and to attenuate the added pulses in response to control signals.

85. The device according to p. 84, wherein the attenuator includes a circuit damping for damping added pulses.

86. The device according to p. 84, characterized in that the attenuator reduces the supports added pulses relative to the blanking level.

88. The device according to p. 84, characterized in that the attenuator reduces the amplitude of the added pulses.

89. The device according to p. 84, characterized in that the attenuator records the location of each of the added pulses relative to the pulse horizontal sync in each row.

 

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