Device processing television signals in pay-tv systems

 

(57) Abstract:

The invention relates to the field of radio and, in particular, to devices for signal encoding in pay-TV systems, using both cable networks and broadcasting through radio channels. Provides increased strength and reliability of the channels of pay-TV systems. Consists of the encoder 1 and decoder 2 devices. The encoder includes a control unit 3, block inversion 4, block associations 5, the correction block 6, block allocation 7, block 8 quantization. The decoding device includes a control unit 9, block inversion 10, block associations 11, the correction block 12, block allocation 13, block quantization 14. The input of the coding device associated with low-frequency output videotrack amplifier transfer, and its output to the low frequency input videotrack modulator transfer. The input of the decoding device connected to the LF output videotrack PFP and its output to the LF input videotrack PFP. After appropriate signal processing is achieved the possibility of multiple combinations increase encoding, which increases the cryptographic systems and the sustainability of its work in the possible instabilities of the radio channel. 1 C.p. f-crystals., 9 Il.

Mestnosti, can be used to encode the signals in the systems of pay-TV transmitted using radio waves or cable.

The known device processing television signals, see for example, European patent EPO E N 341801 from 01.04.90 g, class H 04 N 7/167. USSR author's certificate N 1663777 from 01.01.80 g, class H 04 N 7/137.

Known devices include: analog-to-digital Converter (ADC) block separation of the luminance and color signals, subtractive unit, a quantizer, encoder, the block buffer memory control unit, the adder, the evaluation unit, module selection, splitter, decoder, d / a Converter. In known devices is the processing of television signals by inversion through the line, which allows for encoding of the signal transmitted over the cable, thus excluding unauthorized access and viewing television programs.

The lack of analogues is that they force the stringent requirements for stability of channel parameters at their technical realization is acceptable only in cable television networks, in addition, these analogues have low cryptographic due to the fact that the devices involve the inversion as one of the spreading device of the video processing in the network, pay TV, described in Japan patent N 12 B4 [11] CL H O4 N 7/167 621397 from 01.01.91,

The prototype includes the encoder and decoders. In turn encoder, the device consists of a control device, switch, filter wrench, two reference quartz generator, adder, the inversion module and schema merging.

The decoding device comprises a control device, switch, key, filter, module-reverse inversion schemes Association and two operational amplifiers.

In this arrangement, the television signal is received at the device, is converted by the principle of interlaced inversion in the SECAM system, and at the receiving side signal in the decoder is undergoing reverse processing.

Thus, this is an opportunity to encode the signal and prevent unauthorized viewing of TV cable network. However, the prototype has drawbacks:

low crypt, because it uses a single encoding method;

the device provides a stable work only in cable television systems, because it imposes stringent requirements on the stability of the channel parameters.

The aim of the invention is to develop updatenotify and supporting the system in the cable network, and in the paths using the freely propagating waves (radio links).

This objective is achieved in that in the known device processing television signals in pay-TV systems, consisting of the coding and decoding devices, each of which includes control units, inversion, and combining the signal, and inputs the coding and decoding devices associated respectively with the low-frequency (LF) output videotrack amplifier of the transmitter (send) and LF output videotrack receiver (PFP), in each of the devices for encoding and decoding introduced additional correction blocks, the selection of clock pulses and quantization.

In each of the devices for encoding and decoding their inputs connected to the inputs of blocks inversion and selection, and outputs the latter to the inputs of the control unit. The outputs of the control unit is connected to the inputs of the block of quantization, and the output of the latter is connected with the first input of the block Association. The outputs of blocks inversion is connected to the inputs of the error correction block, the outputs of which are connected to the second and third inputs, the block Association. The outputs of devices for encoding and decoding respectively connected with low-frequency input videotrack modulator the deposits in each of the devices for encoding and decoding the additional second units inversion and associations, the outputs of the second block inversion is connected to the first and second inputs of the second block Association, a third input associated with additional output block quantization. The input of the second block inversion in the encoding device is connected to its second input associated with the low frequency output of the audio transfer. The output of the second unit combining the encoder is connected to its second output associated with the low frequency input to the audio modulator transfer. The input of the second block inversion decoding device is connected to its second input connected low frequency output of the audio receiver. The output of the second block Association decoding device is connected to its second output associated with the LFE input of the amplifier to the audio receiver.

Listed set of essential features allows the inventive device to significantly improve the cryptographic strength of 4096 code combinations), thus reducing unauthorized access when viewing television broadcasts, as well as the ability to transmit coded television signals not only with the cable, and wireless links.

The claimed device illustrated by the drawings, which is shown in Fig. 1 is a structural diagram of a device with COA Fig. 3 block diagram of the control unit of Fig. 4 is a structural block circuit diagram of the inversion, and Fig. 5 block diagram of the error correction block of Fig. 6 is a structural block circuit diagram of the Association; Fig. 7 is a structural block circuit diagram of the quantization of Fig. 8 is a structural block circuit diagram of the allocation of Fig. 9 stresses, explaining the operation of the device.

Device processing television signals in pay-TV systems, shown in Fig. 1, consists of the encoder 1 and decoder 2 devices. The encoder 1 videotrack includes a control unit 3, block inversion 4, block associations 5, the correction block 6, block allocation 7, block 8 quantization. The decoding device 2 includes a control unit 9, block inversion of videotrace 10, block associations of videotrace 11, the correction block 12, block selection clock 13, block quantization 14.

The input of the coding device 1 is associated with low-frequency output videotrack send K1 and is connected to the inputs of blocks inversion 4 and excretion 7. The outputs of block allocation 7 are connected the first and the second input of the control unit 3. The outputs of the control unit is connected to the inputs of the block of quantization 8, and the output of the latter is connected with the third input of the block Association of videotrace 5. The outputs of the block inversion 4 associated with TLDs is a block Association K2 c is connected with the modulator transfer.

The input of the decoding device 2 is connected on the LF output videotrack PFP D1. Input 1 is connected to the input of the inversion 10 and the input unit selection 13. The outputs of block allocation 13 are connected with the first and second photomama control unit 9. The outputs of the control unit is connected to the inputs of the block of quantization 14, and the output of the latter is connected with the third input of the block Association of videotrace 11. The outputs of the block inversion 10 is connected with two inputs of the error correction block 12, the outputs of which are connected to first and second inputs of the block Association 11. The output of block associations D2 is connected to HT amplifier PFP.

If encoding audio encoding in the device 1 additionally introduced into AudioTrack blocks inversion 15, associations 16 (see Fig. 2).

Similarly, the block decoding 2 put blocks inversion audio 17 and associations 18. This WOOFER input audio K3 is connected to the input of the second block inversion 15. The outputs of the second block inversion is connected to the first and second inputs of the second block Association 16. To the third input of the second block Association 16 is connected to the output unit 8 quantization. The output of block associations 16 is connected to the second output of the coding device 1 K4, which is associated with glucan to its second input, associated with the low frequency input AudioTrack PFP D3. The outputs of the second block inversion 17 is connected to first and second inputs of the block combining audio 18. To the third input of the second block Association 18 is connected to the output of the block of quantization 14 decoding device 2. The output of block associations 18 is connected with the second output of the decoding device 2, which further connects to the WOOFER audio amplifier D4.

Shown on Fig. 1 and 2, blocks 3, 4, 18 can be implemented by known circuits, for example, as shown in Fig. 3, 4, 8.

So the control unit (see Fig. 3) can be implemented on the basis of known triggers series K155, K, K555, and so on (the control Units 3, 9 in the encoder and the decoder are identical).

In Fig. 4 shows a possible variant of the block inversion, which is made on a separate operational amplifier series C etc. (Blocks inversion 4, 15, 10, 17 at the encoder and the decoder are identical).

In Fig. 5 shows a possible embodiment of the error correction block in a typical operational amplifiers C UD and so on (correction Blocks 6, 12 at the encoder and the decoder are identical).

In Fig. 6 shows a possible variant of unit, Association for typical elements: the scheme OR NOT, transis is shown In Fig. 7 shows a possible variant of the block of quantization that is performed on the chip known series K155, K, K555, etc. (Blocks quantization 14, 8 in the encoder and the decoder are identical).

In Fig. 8 shows a possible variant of the block selection pulses which are executed on the model elements. (Blocks allocation, 7, 13, in the encoder and the decoder is performed in the same manner.)

The claimed device operates as follows. When the input K1 encoder 1 signal (see Fig. 2) it forks. The first branch is fed to the input of block allocation 7 to create horizontal and personnel sidhropoulos (see Fig. 9,a), which synchronize the system with the input signal. The selected clock is fed to the input of the control unit 3, where the formation of the escape sequence (see Fig. 9,b)

The obtained sequence determines the operation of the quantizer 8), and he in turn gives the command (see Fig. 9) with two outputs on the third inputs of blocks Association of the sound path 16 and tract image 5, which determine the sequence of Association respectively the direct and inverse acoustic and video signals. In Fig. 9, g, d, also shows the control voltage, which ha is happening in the inversion of the video signal is strictly through the line. In the inventive device, the inversion signal is the control signal from the control unit 3.

This allows us to conclude that the prototype is significantly inferior to the claimed device by the number of code combinations. The video signal through the second branch goes to the block inversion 4. In block inversion 4 is the formation of forward and reverse sequences. Further, the output signal of the block inversion 4 are held in the correction block b, where the balancing and adjustment of the levels of the forward and reverse signals, to reduce the amplitude-frequency distortions that occur during the processing of the signal at low frequencies, to provide the opportunity to work on radio and cable. Next, the signals are sent to the join scheme 5, where the code alternation direct and inverse signals, which are then fed to the input of the modulator transfer K2.

To the second input of encoder l K2 signal sound, and then it is fed to the input of block l5 inversion of the sound path, where the formation of forward and reverse sequences. Then both signals from the output of the block inversion 15 pass to join scheme 16, where the code alternation direct and inverse signals due at the Oia 8 encoded signal to the input of the modulator transfer.

At the entrance to the decoder coded signals are reverse processing on the same block and the output is a recovery of the original signal.

Thus, thanks to the introduction of additional blocks in the device is greatly enhanced cryptographic strength (up to 4096 code combinations) and ensures the transmission of the processed signal by radio and cable.

1. Device processing television signals in pay-TV systems, consisting of the coding and decoding devices, each of which includes a driver control pulse trains, blocks inversion of polarity and combining the video signal, and inputs the encoder and decoder devices associated respectively with the low-frequency output videotrack amplifier of the transmitter and subwoofer output of videotrace receiver, characterized in that encoders and decoders have been added to the units of the amplitude correction, highlight clock and quantization, and in each of the devices for encoding and decoding their inputs connected to the inputs of blocks inversion of polarity and separation of pulses and outputs a block selection pulses to the inputs formirovatb block quantization associated with the third input of the block Association video the outputs of the block inversion polarity connected to the inputs of unit amplitude correction, the outputs of which are connected to first and second inputs of the block Association video signal, and output devices for encoding and decoding respectively connected with low-frequency input videotrack the transmitter modulator and low-pass input videotrack receiver.

2. The device under item 1, characterized in that it further in each of the devices for encoding and decoding entered the second block inversion of polarity and the unit of Association of a sound signal, and outputs the second block inversion polarity connected to the first and second inputs of the second unit combining the audio signal, the first input of which is connected with the additional input of the block of quantization, the input of the second block inversion of polarity in the encoding device is connected to its second input associated with low-frequency output audio transmitter, and the output of the second unit combining the audio signal encoding device is connected to its second output, associated with the low frequency input to the audio modulator of the transmitter, the input of the second block inversion of polarity in the decoding device is connected to its second input, svasato decoding is connected to its second output, associated with low-frequency input of the amplifier to the audio receiver.

 

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