The method of scrambling a television signal and a device for its implementation

 

(57) Abstract:

Usage: in television technology in cable systems television commercial. The inventive device for scrambling a television signal contains the source of the television program, the output of which is connected to the modulator of a television signal, and the control unit, the output gate pulse which is connected to the input of the shaper false pulses and sidhropoulos, a power amplifier whose output is the output of the transmitting side device scrambling a television signal, the input block and storing the codes of the first and second adders, the modulator control signals, the control output of the control unit is connected to the clock input unit inputting and storing codes, the output of the shaper false pulses and sidhropoulos connected to the second input of the first adder, the output of which through the modulator control signals connected to the first input of the second adder, the output of the modulator TV signal connected to the second input of the second adder, the output of which is connected to the input of the power amplifier. At the receiving side devices are cascaded amplitude modulating the signal, selective amplifier, a detector, a comparator, a clock selector, selector, Comparer codes, memory, time relay and managed key. The output of the broadband amplifier using cascaded selective amplifier, a detector and a comparator connected to the signal inputs of the switch and selector clock signal output of which is connected to the control input of the switch, one output of which through the block comparison codes, the drive pulse and the time relay connected to managing the input of the key, the other output of the switch is connected to the signal input of the key, the output of which is connected to the control input of the amplitude modulator. 2 C. p. F.-ly, 3 ill.

The invention relates to a television technique can be used in cable systems television commercial.

You know the commercial cable television, containing in each television receiver generator of sinusoidal oscillations and the switch, so that the oscillation frequency of each oscillator corresponds to a given receiver and the selected program.

The disadvantages of this device are limiting the number of controlled priemnaja freely, you can take television receivers, not having subscriber units.

There is a method of scrambling a television signal, which transmit frames of the image signal with suppressed lower clocked and HR intervals, filled with pulses and also the same way in the transmitted television signal are suppressed sync and sound carrier amplitude modulated by the clock. Restoration of the normal video signal is carried out by special units, managed from blocks of payment, for example, by use of special tokens.

The disadvantage of this technical solution is the complexity of the decoding device, the need for well-developed infrastructure of the payment by the subscriber of watching TV and the inability to control the TV without payment, which reduces the efficiency of the use of this technical solution.

The aim of the invention is to increase functional reliability and enhanced functionality of way, as well as simplifying the device that implements the method.

In Fig. 1 presents a functional diagram of the transmitting side device; Fig.2 functional diagram of Prien Device for scrambling a television signal contains (see Fig.1) channel 1 television program, the output of which is connected to the modulator 2 of the television signal and the control unit 3, the output of gate pulses which is connected to the input of the shaper 4 false pulses and sidhropoulos, power 5 power whose output is the output of the transmitting side device scrambling a television signal, block 6 input and storage of codes, the first 7 and second 8 adders, the modulator 9 control signals, the control output of the control unit 3 is connected to the clock input unit 6 input and storage of codes, the output of which is connected to one input of the first adder 7, the output of the shaper 4 false pulses and sidhropoulos connected to the second input of the first adder 7, the output of which through the modulator 9 control signals connected to the first input of the second adder 8, the output of the modulator 2 TV signal connected to the second input of the second adder 8, the output of which is connected to the input of the amplifier 5 power. At the receiving side (see Fig. 2) the device contains a series of amplitude modulator 10 and a broadband amplifier 11 whose output is the output of the scrambling a television signal, a selective gain the spruce 18, relay 19 time and managed key 20. The output of the broadband amplifier 11 through a series of selective amplifier 12, a detector 13 and the comparator 14 is connected to the signal inputs of the switch 16 and the selector 15 clock signal output of which is connected to the control input of the switch 16, one end of which is through the block 17 comparison of the codes, drive 18 pulses and relay 19 time connected to the control input of the key, the other output of the switch is connected to the signal input key 20, the output of which is connected to the control input of the amplitude modulator 10.

To the timing charts (see Fig.3) shows the relative signal 20 with the entered faster lowercase false and false trailing HR clock (two fields), undistorted signal 21 (two fields), the corresponding spurious signals in time signals 22 governance and code of parcel 23 during transmission undistorted video signal 21.

Full video from source 1 television program such as a VCR, passes through the modulator 2, the adder 3, the amplifier 5 power output of the transmitter of the device. In the absence of signals at the output of the shaper is s device (cable or air).

At the same time full video from the source 1 of the television program to the input of the control unit 3, which generates the gate pulses, of which the imaging unit 4, false pulse and sidhropoulos generates corresponding pulses of the required duration and location in the video signal (see figure 20 in Fig.3), as well as control pulses, which are submitted to the sync input 6 input and storage codes with an interval of two fields and synchronize the issuance codes turn off subscribers unit 6 in this interval. The imaging unit 4 may be implemented, for example, on the chip HA.

From the output of the shaper 4 pulses arrive at the input of the amplitude modulator 2 and through the adder 7 to the modulator 9 control signals (pilot signal). This ensures the formation simultaneously false pulses comprising signal (figure 20) and the corresponding pulses through the adder 8 and the amplifier 4 power output of the transmitting part on the frequency of the pilot signal (chart 21).

Input amplitude selective modulator 10 is supplied complete television signal of any television channel (20, 21) and the pilot signal on a carrier outside of canica (not shown), and through the amplifier 12 that is configured on the frequency of the pilot signal, a pilot signal, which, after detection by the detector 13 and elektrownie the comparator 14 has the shape shown in Fig.3 (22, 23).

The selector 15 clock generates at its output a signal when the transmission synchrophasing that controls the switch 16, so that the signals corresponding to figure 22, is fed to the input key 20 and figure 23 to the input unit 17 comparison codes. Although the pulse synchrophasing through the switch 16 and the key 20 is held on the selective amplitude modulator 10, it does not cause any interference in the work of the synchronization of the receiver, as the human form of the sync pulse is not changed.

In the original (standby) mode key 20 is closed, so the pulses (see Fig.3, POS.22) is fed to the input of a selective amplitude modulator 10 and is compensated predistortion, which were introduced on the transmission side in the amplitude modulator 2. The input of the television receiver receives an undistorted signal. However, if the code generated by the unit 6, match the code of the subscriber and stored in the unit 17, the output of this block appear pulses in the drive 18. Drive 18 increases polioptila receiver system SECAM. When the presence of a signal at the output of the drive 18 is activated, the relay 19 time to time, opens the key 20. When the input of the television receiver receives the television signal from the false pulses. This leads to a "poddergivayu" image vertically and horizontally and luminance flashes of images, which makes it impossible for normal observation transmission.

1. The method of scrambling a television signal, namely, that form a false sync with subsequent mixing in the video signal and transmit them to the frequency of the pilot signal, and at the receiving side distinguish the false synchronizing pulses, characterized in that an input of a false sync are leading personnel and trailing lowercase pulses are injected into the video signal with an interval of two fields, and the frequency of the pilot signal in the same time interval transmit impulses corresponding to spurious pulses and the interval following two fields at the frequency of the pilot signal transmit code signals, which at the receiving side when a match is highlighted code pulse code assigned to the user, generate a signal prohibiting decoding televizionnom fields, in which the transferred code parcel.

2. Device for scrambling a television signal containing on the transmission side source television programs, the output of which is connected to the input of the control unit and the first input of the modulator of a television signal, the modulator control signal, at the receiving side of the amplitude modulator, the input of which is the input television signal, and the output connected to the input of the broadband amplifier, the output of which is connected to the input of the television receiver, characterized in that the input to the transmitting-side block of the input and storage of codes, an input connected to the first output control unit, and the output connected to the first input entered first adder, a second input connected to the output of the shaper false pulses and synchromesh, the output of the adder is connected to the input of the modulator control signal, the output of which is connected to the first input entered a second adder, a second input connected to the output of the modulator is a television signal, and the output connected to the input of the power amplifier on the receiving side connected in series introduced selective amplifier, a detector, a comparator, a clock selector, impulso, the first output switch connected to the input unit of comparison codes, the output of which is connected to the input buffer, the output of which is connected to the first input of the control key, a second input connected to the relay output time, and the third its input signal the output switch, the second output drive is connected to the input of the time relay, the output controlled key is connected to the control input of the amplitude modulator.

 

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