The method of forming interference to the video signal pal, secam and device for its implementation

 

(57) Abstract:

Usage: in the TV cryptographic technique when forming the encrypted television signals PAL and SECAM. The inventive method of forming interference to the video signal PAL and SECAM by permutation of rows controlled by the signals pseudorandom sequence, when restoring videotrak control the decoder signals pseudorandom sequence, synchronized with the signals of the pseudo-random sequence in the formation of interference, the signal control signals pseudorandom sequence is introduced into the video signal. The difference is that the shift in time from the beginning of each active line start of interval noise line, the amount of displacement change every 40 MS, and the transmission delay unprotected useful part of each line by the value of the duration of one line. The television decoder contains connected in series amplifier, low pass filter, decoupling capacitor, the managed connection key reference signal, an analog-to-digital preobrazovatelya, logical block filters, a lowpass filter and an output amplifier, a follower of the Alov and logical block filters. Logical block filters made in the form of parallel connected two drives and case (filter-tube), and the logical output of the filter block is connected to the second input of the filter tube. 2 S. and 2 C. p. F.-ly, 2 tab. , 4 Il.

The invention relates to a television cryptographic technique and can be applied when forming the interference signals PAL, SECAM.

The aim of the invention is to improve the reliability of unauthorized reception.

The formation method is the inversion of the noisy areas in each row relative to the beginning of the string, and the offset of the beginning of a noisy areas vary in time, the amount of displacement change after 40 MS, while the signal transmission withstand nezakonchennoy part of each line by an amount equal to the duration of one line.

Structural block diagram of a television decoder shown in Fig. 1.

The television decoder contains connected in series amplifier 1, the filter 2 lower frequencies, the decoupling capacitor 3, point 4 anchor analog-to-digital Converter 5, a digital block 6 filters, d / a Converter 7, the second filter 8 of the lower frequencies, the output amplifier 9. Unit 6 is operated logs the time control signals (left) from the microprocessor 12, an input connected with a computer (not shown).

In Fig. 2 shows a time chart of the United videotrace, not exposed to the device, interference, and Fig. 3 is a timing chart line after exposure to noise; Fig. 4 is a timing chart of signals in the decoder.

Before processing the combined signal to be transferred corresponds to the report 664 SSR system SECAM. The starting point of this signal is marked by the middle pulse horizontal sync. The countdown is zero. Is 826 times in a row (frequency quantization is 14 MHz). This example is shown in Fig. 2, where X is the current point of a line is selected as the point of introduction of interference.

The noisiness of the signal is carried out by dividing into two useful parts of the string and the temporary currency position of these parts (Fig. 3). The position control point line separation into two parts is performed using the signal from the generator 11 pseudo-random signals (functions) that can be adjusted only if the correct decryption of the control word access generator, implemented by the decoder. Pulse blanking lines are not exposed to noise.

< / the effect of a disturbance the sequence of the subcarriers color matches a sequence of color identification frame (raster). This interval contains quanta from 847 to 120, inclusive, i.e., 170 quanta. The segment corresponds to the end part (utility) line before the noise. Segment b corresponds to the beginning of the useful line before the noise.

In Fig. 2 also shows two overlapping zones Z and Y, the area To the end of the active video signal. The definition and role of these various segments and regions detailed in table. 1.

Segments b and C are transmitted in the line before the set of subcarriers on the site blanking line. This is done to compensate for the delay introduced in unit 6 filters.

In Fig. 3 shows the signal with noise. The formation method also includes an operation bias lines around the point of discontinuity X - offset of the beginning of the noisy zone relative to the beginning of the useful part of the line that allows you to disguise the position of the break point X - the beginning of the useful part of the line (DUL, Fig. 2), which is also the end of a step or pulse blanking line R, located on the black level and which support videorones. At the point DUL level of the video signal takes a value and the derivative of the area R, S, and So These segments and zones are explained in detail in the table. 2.

In order to eliminate uncertainty in the recognition of a temporary support, a specified number of quanta is repeated from one and other sides of the break point. These duplicate quanta is also used in conjunction with interpolation to reduce the effects of artificially introduced distortions in the image quality after the removal of interference in the presence of distortion in the transmission path. Using samples interpolation allows to increase protection from any attempts of reception. The readout of A quantum, which is first subjected to noise, has shifted the area of support. Therefore A reference does not match the black level that could be detected.

Segment of A reference modulate that increases protection against piracy, he has in his left side nezakonchennoy the zone of small width. Modulation of the duration of A segment produced within 40 MS.

In the intermediate zones R, S and T are placed corresponding quanta to dampen the effects of transitions. An example of a weighting coefficient counts:

The transition R

Quantum 121 E211 = 8(120) + 1/8(X-5)

-"- 122 e = 1/2(120) + 1/2(X-5)

-"- 123 E = 1/8(120) + 7/8(X-5)

Transition S

Quantum (953-X)

E(953-X) = 78(X+4) + 1/8(847)

-"- 845(845) = 1/3(X+ 4) + 1/2(847)

-"- 846(846) = 1/8(X-4) + 7/8(847)

The frequency of the quanta and the introduction of quanta interpolation is such that the active part of the line is restored after the removal of interference is reduced by 1.2 Ás.

The noisiness of signals PAL and SECAM during blanking raster is as follows.

Line 311 at 335 and 623 22 not Zasulauks. Videotrace 23 and 336 of the original image is not transferred. Line 622 310 and transmitted noise with subsequent transfer without noise.

Identification information about color is formed after the removal of noise in the decoder and is carried out before the color, which he preceded to noise. If carried out, for example, the noisiness of the sequence, then enter the ID of the (R-Y)n-1/(R-Y)n-1ID (B-Y)n(B-Y)nID (R-Y)n+1/(R-Y)n-1after clearing the noise get the ID of the (B-Y)n(R-Y)n-1(ID (R-Y)n+1(B-Y)n, which leads to the occurrence of the false color noise in the treated rows. To correct these distortions decoders provide a delay line delaying the signals on one line. This extra delay is made in the form althout register (filter) tube.

In Fig. 4 shows time diagrams of block 6 filters to be cleaned from noise. Block 6 contains is in parallel with the first and second drives 13 and 14 FIFO and register (filter)-tube 15. Signals (main) tape control type FIFO shown in Fig. 4, where WE is the write enable; RSTW - set to zero from record to record; RE - enable the read; ENB - activation register-tube 15. (56) U.S. Patent N 2847768, CL H 04 N 3/10, 1984.

THE METHOD OF FORMING INTERFERENCE TO THE VIDEO SIGNAL PAL AND SECAM AND DEVICE FOR ITS IMPLEMENTATION

1. The method of forming interference to the video signal PAL and SECAM, which consists in the rearrangement of the lines controlled by the signals of the pseudo-random sequence, and when restoring videotrak control decoder signals pseudorandom sequence, synchronized with the signals of the pseudo-random sequence in the formation of interference, the signal control signals pseudorandom sequence is introduced into the video signal, characterized in that, to improve the reliability of unauthorized reception, shifting over time from the beginning of each active line start of interval noise line.

2. The method according to p. 1, characterized in that the amount of displacement change is each useful line on the value of the duration of one line.

4. Apparatus for forming an interference to the video signal PAL and SECAM containing connected in series amplifier, a lowpass filter and decoupling capacitor, the managed connection key reference signal, an analog-to-digital Converter, digital-to-analog Converter, a low pass filter and an output amplifier connected in series control unit, the input of which is the input signal from the computing machine, the generator of pseudorandom signals and the logical block, wherein the filter unit is made in the form of parallel connected two drives and filter tube, United inputs and outputs of the two drives and filter tube are respectively the input and output of the filter block, and the output of logic block connected to the second input of the filter tube filter unit.

 

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