RU2131646C1 - Device for transmission of tv signals - Google Patents

Abstract

FIELD: TV equipment, in particular, for transmission of confidential TV data. SUBSTANCE: device has serial circuit of orthogonal signals generator, clock oscillator, two delay gates, and reset unit which is connected to them. In addition device has serial circuit of signal adder and linear unit, and manipulators, and has units of brightness, sound, color, synchronization pulse generator, which comprise manipulators. Device implements compression and separation of video signal constituents with respect to shape. Modulation and manipulation of constituents of TV signal by Walsh functions is provided by respectively modulators and manipulators, which inputs receive TV signal constituents and channel signals which are detected by orthogonal signals generator. Input signals of modulators and manipulators are added and provide parallel orthogonal code combinations at device output. Said code combinations belong to noise-type signals, which are secure against unauthorized access. In addition source frame synchronization signals are not transmitted, but circuit generates its own frame synchronization signals from line synchronization signals. EFFECT: increased protection against unauthorized decryption of confidential TV information. 1 dwg

Description

 The invention relates to television technology and can be used to transmit confidential television information, in particular, in methods of masking television image signals.

 A multi-channel transmitting device is known in which the manipulation of computer signals by Walsh functions is carried out by switching units that connect the inputs of the manipulators to the outputs of the orthogonal signal generator [1].

 The closest in technical essence and the achieved result to the proposed device is a signal transmission device containing a series-connected orthogonal signal generator, a clock driver, first and second delay elements, a reset unit, the input of which is connected to the second output of the first delay unit, the adder connected in series signals and a linear block and manipulators [2].

 The disadvantage of the prototype is the inability to transmit confidential television information with it, because it does not provide modulation of the components of the television signal, and also does not allow to maintain horizontal and frame synchronization.

 The objective of the invention is to remedy this drawback.

 The problem is solved as follows.

 A phasing unit, a brightness unit, and a sound unit are introduced into the known device, each of which consists of a series-connected sampler, quantizer, and modulator, the inputs of the samplers being the inputs of the blocks, and the output of the modulator being the output of the blocks, the block for generating frame sync pulses consisting of a frequency divider, which is the first input of the block connected in series with the first sampler of the block and the first manipulator, and the second sampler, which is the second input of the block connected to the second m manipulator, color block, consisting of three channels, each of which contains samplers, the inputs of which are inputs of the block, and the outputs are connected to the first inputs of the color block manipulators, the output of the phasing block connected to the input of the orthogonal signal generator, the second, third, fourth, the fifth, sixth, seventh and eighth outputs of the orthogonal signal generator are connected to the second inputs of the modulators of the brightness and sound blocks and to the second inputs of the manipulators of the color blocks of the horizontal and vertical scans approx. The output of the reset unit is connected to the second inputs of the quantizers of the blocks of brightness and sound, the outputs of the modulators and manipulators are connected to the corresponding inputs of the adder.

 The drawing shows a diagram of the device.

 The device contains a phasing unit 1, an orthogonal signal generator 2, a clock generator 3, a first 4 and a second 9 delay elements, a reset unit 12 in each quantization circuit, quantizers 6, 7, samplers 5, 8, 13, 16, 18, 21, 22, modulators 10, 11, manipulators 14, 15, 19, 20, 23, a frequency divider 17, an adder 24 channel signals, a linear unit 25, a television signal source 26.

 Positions 27, 28, 29, 30 are blocks of brightness, color, sound and clock pulses, respectively.

 The phasing unit 1 is connected in series with the orthogonal signal generator 2, the first output of which is connected to the input of the clock generator 3 connected to the first delay element 4, the output of which is connected to the inputs of the second delay element 9 and the reset unit 12 in each quantization circuit. The output of the delay element 9 is connected to the first inputs of the samplers 5, 8, 13, 16, 18, 21, 22. The second inputs of the samplers are inputs of the blocks of brightness, sound, the formation of horizontal and frame sync pulses. Samplers 5 and 8 are connected in series with quantizers 6 and 7 and modulators 10 and 11, respectively, the second input of the latter receives a signal from the second output of the orthogonal signal generator 2. The outputs of the modulators 10 and 11 are connected to the inputs of the adder. The outputs of the discretizers 13, 16, 18, 21, 22 are connected to the inputs of the manipulators 14, 15, 19, 20, 23, respectively. The outputs of the manipulators are connected to the input of the adder 24, which is connected to the linear block 25.

 The output of the source of the television signal 26 is connected to the inputs of the blocks of brightness 27, color 28, sound 29 and the formation of clock pulses 30.

 The device operates as follows.

 From the source of the television signal 26 (VCR, camcorder), a luminance signal Ey, primary color signals Er, Eg, Eb, horizontal sync pulses (SSI) scan, sound signal Esd are received. Each signal is fed to its own channel of modulation and manipulation.

 Consider processing the luminance signal Ey. The Ey signal is fed to the input of the modulation block, consisting of a sampler 5, the output of which is connected to the input of the quantizer 6, the output of which is connected to the input of the modulator 10. The processing of the Ey signal in the modulation block is as follows. At the inputs of the sampler 5 receives the brightness signal Ey and the recording pulses. The recording pulses are generated in the generator 3 clock pulses and to ensure the specified processing modes in the transmitting device circuit are subjected to a temporary shift in the delay elements 4 and 9. The frequency of the recording pulses is selected based on the possibility of discrete decomposition of a continuous video brightness signal, and is set by the clock frequency of the generator 2 of orthogonal oscillations . From the output of the sampler, discrete reports of the brightness video signal are supplied to quantizer 6, where they are quantized and stored until the reset pulse comes from reset unit 12. Prior to the reset by the zeroing pulse, the quantized report arrives at the input of the modulator 10, the channel signal from the output of the orthogonal oscillation generator 2 is supplied to the second input of the modulator 10. From the output of block 10, a modulated brightness signal is supplied to the corresponding input of the adder 24.

 The Esd sound signal is processed similarly by the specified orthogonal signal in its modulation block, consisting of a sampler 8, the output of which is connected to the input of the quantizer 7, the output of which is connected to the input of the modulator 11. The modulated sound signal Esd from the output of the block 11 is fed to the corresponding input of the adder 24 .

 A phasing unit is introduced into the device, consisting, for example, of a video pulse generator and a matching device. The phasing unit 1 provides the coordination of the phases of the orthogonal oscillation generator 2 and the frame sync pulse generator, which is part of the source of the television signal (VCR or video camera).

 To increase the durability of the transmitted video information, a frame sync pulse forming unit consisting of a frequency divider 17 is introduced into the device. Horizontal sync pulses (SSI) are fed to the input of the frequency divider 17, which are divided, and the generated frame sync pulse is then fed to the sampler 16, from the output of which it goes to the manipulator 15. In the manipulator, the discrete report of the frame clock is manipulated by the corresponding channel orthogonal signal coming from the orthogonal signal generator 2. Manipul The synchronized frame clock from the output of the manipulator 15 is wound to the input of the adder 24.

 Signals of horizontal sync pulses (SSI) and primary color signals Er, Eg, Eb are manipulated similarly to frame sync pulses. The FID signals are processed by the sampler 21 and the manipulator 20, the Er signal by the sampler 13, the manipulator 14, the Eg signal by the sampler 18, the manipulator 19, the Eb signal by the sampler 22, the manipulator 23. After processing, the manipulated FID signals, Er, Eg, Eb are fed to the corresponding adder input 24.

 Modulated signals from modulators 10, 11 and manipulated signals from manipulation units 14, 15, 19, 20, 23 are fed to the inputs of the adder 24 channel signals, the output of which is formed by a complex waveform that represents parallel orthogonal code combinations. Such code combinations belong to the class of noise-like signals that are resistant to unauthorized interference. The received signal is input to the linear block 25, and then transmitted to the high frequency modulator of the transmitting station.

The recognition process for orthogonal code combinations can be represented as a combination of recognition devices for individual complex constituent elements of orthogonal sequences and recognition devices for parallel orthogonal code combinations. Such a perception for unauthorized recognition, when neither the class of orthogonal signals is known, nor the signal that is transmitted, is a very difficult and practically insoluble task, since decoding even one information symbol of a seven-bit parallel code combination will require enumeration of the order of ^2,634 combinations, i.e. by the time of decoding, temporary loss of information will lead to complete information loss. Therefore, for an unauthorized user, recognition becomes almost impossible. Thus, in this case, when perceiving and recognizing orthogonal code sequences, it makes sense to speak only about pattern recognition of code combinations by an authorized user.

 In addition, the invention eliminates the use of various existing color television systems and allows the transmission of color television images and sound through communication channels without additional processing and pre-emphasis in analogue correctors, selective filters and other blocks that make irreparable changes in the amplitude-frequency characteristics of the video signal . The device uses the method of compaction and separation of the components of a television signal in shape. Modulation and manipulation of the components of the television signal by Walsh functions is carried out by modulators and manipulators, respectively, to the inputs of which the components of the television signal and the selected channel signals from the output of the orthogonal signal generator are supplied. The output signals of modulators and manipulators are added and at the output of the device form parallel orthogonal code combinations. Such code combinations belong to the class of noise-like signals that are resistant to unauthorized interference. In addition, to increase the resistance of the transmitted video information to unauthorized disclosure, the original frame sync pulses are not transmitted, the frame sync pulses are formed from the horizontal sync pulses.

Sources of information
1 Copyright certificate of the USSR N 1336078, cl. G 08 C 19/28, published 07.09.87.

 2 USSR Copyright Certificate N 392544, cl. G 08 C 19/28, published July 27, 73.

Claims (1)

 A device for transmitting signals, comprising a series-connected generator of orthogonal signals, a clock driver, first and second delay elements, a reset unit, the input of which is connected to the output of the first delay unit, series-connected adder of channel signals and a linear unit, characterized in that it is provided with a source a television signal, a phasing block, a clock block, a color block, a brightness block and a sound block, the first input of which is connected to the first output of the source of the bodies Evision signal, the first input of the brightness unit is connected to the sixth output of the television signal source, the third inputs of the sound and brightness blocks are connected to the output of the reset unit, the first, seventh and sixth inputs of the color block are connected respectively to the fifth, fourth and third outputs of the television signal source, the first input the clock block is connected to the second output of the television signal source, the second inputs of the blocks of brightness, sound, color and clock are connected to the output of the second delay element, the seventh output of the source A television signal is connected through a phasing unit to an orthogonal signal generator, the second, third, fourth, fifth, sixth, seventh and eighth outputs of which are connected respectively to the input of four brightness blocks, with inputs of three, four and five color blocks, with inputs of four and three a clock block and an input of four sound blocks, the outputs of the brightness block, color block, sound block, and clock block are connected to the corresponding inputs of the channel signal adder.