SU1172080A1 - Device for transmission and reception additional information via television cable - Google Patents

Abstract

A DEVICE FOR TRANSMITTING AND RECEIVING ADDITIONAL INFORMATION ON A TELEVISION CABLE, containing on the transmitting side not an amplifier, a terminating resistor, one output of which is connected to the input of the amplifier and the input of the device, another output of the matching resistor, connected to the earth bar, the modulator of which to the input of the amplifier, the output of which is connected to the input of the television cable l, serial-to-parallel converter, serially connected control unit, pulse generator and pre The parallel code breaker is sequential, and at the receiving side is a serial to parallel converter, a terminating resistor, an indicator, an amplifier and a modulator, whose output is connected to the amplifier input, to the indicator input, and to the first terminal of the matching resistor, the second output of which connected to the earth ground, a control unit connected in series, a pulse generator and a parallel code-to-serial code converter, characterized in that, in order to reduce distortions, information, a code comparison unit, a level converter and a serially connected differential amplifier, an amplitude selector and an OR element are entered on the transmitting side; the parallel code npeoCjias output of the parallel code is connected to the first input of the level converter, to the second input of which the pulse generator output is connected, the second and third outputs of the amplitude selector are connected respectively to the first input of the control unit and the first input of the converter in series code In parallel, the second and third inputs of which are connected respectively to the output of the OR element and the second output of the control unit, the third output and the second input of which are connected respectively to the second input of the parallel code to serial converter and the output of the code comparison block whose inputs are connected to the corresponding inputs of the serial converter code in parallel, the amplifier output is connected to the first input i of the differential amplifier, the second input of which is connected to the output through the modulator (L d The level converter, and a code comparison unit, a level converter, an amplitude selector in series and a line selection block, as well as a match block and an OR element are entered at the receiving side, and the amplifier output is connected to the amplitude selector input, the first and second outputs of which are connected respectively to the first input of the OR element and to the combined lN5 first input of the coincidence unit and the second one about the input of the OR element, the output of each of the 00 of which is connected respectively to the first and second inputs of serializer in parallel, the third input and the outputs of which are connected respectively to the second output of the control unit, the inputs of the code comparison unit, the output of which is connected to the first input of the control unit, the third output of which is connected to the second input of the matching unit, the output of the row allocation unit is connected to the second input to the control unit, the output of the pulse generator is connected to the first input of the level converter, the second input of which is connected to the output of the converter parallel

Description

code to serial. The output of the level converter is connected to the input of the modulator, and the first output of the control unit is connected to the second input of the parallel code to serial converter.

The invention relates to television and can be used to transmit and receive additional information in the form of a binary code over a television cable simultaneously with a television signal.

The purpose of the invention is to reduce the distortion of additional information.

FIG. 1 is a schematic circuit diagram of a device for transmitting and receiving additional information via a television cable; in fig. 2 - diagrams of the device.

The device contains an amplifier 1, a terminating resistor 2, a ground bus 3, a modulator 4, a television cable 5, a serial code-to-parallel converter 6, a control unit 7, a pulse generator 8, a parallel code-to-serial converter 9, a serial-to-parallel converter 10 , terminating resistor 11, indicator 12, amplifier 13, modulator 14, control unit 15, pulse generator 16, parallel code to serial converter 17, code comparison unit 18, level converter 19, differential a power amplifier 20, an amplitude selector 21, an OR element 22, a code comparison unit 23, a level converter 24, an amplitude selector 25, a row selection block 26, a match block 27, an OR element 28.

A device for transmitting and receiving additional information via a television cable operates as follows.

The full television signal is fed to the amplifier 1 and the terminating resistor 2 on the transmitting side and through the television cable 5 is fed to the terminating resistor 11 and the indicator 12 on the receiving side and simultaneously through the amplifier 13 to the amplitude selector 25 enters the block 26 line selection, which selects one of the 25 lines of each half-frame, occurring on the reverse course of the vertical scan. FIG. 2a shows the waveform of additional information transmitted and received within a single line. From the source of the full television signal transmission of information

occurs during the first half of the string length, and in the second half - its reception. On the side of the indicator, information is received first, and then transmitted. FIG. 26 shows lowercase

the clock pulses extracted from the television signal at the first outputs of the amplitude selectors 21 and 25. FIG. 2c shows the waveform at the output of the row extracting unit 26. This signal triggers

control unit 15, providing the necessary sequence of operation of other units. The signal from the first output of the control unit 15 (Fig. 2d) permits the conversion of the parallel code to the serial one by the converter 17 and starts the generator 16 of pulses at the moment of information transmission from the indicator side 12. In FIG. 2d shows the signal from the second output of the control unit 15, which is fed to the coincidence unit 27 and allows the received information signal (Fig. 2g) to pass from the amplitude selector 25 to the serial to parallel converter 10. The clock pulses (Fig. 2eJ to control the operation of the serial code converter 10 in parallel come from the OR element 28 to the first and second inputs of which receive signals from the second (fig. 2g) and third (fig. 2i) outputs of the amplitude selector 25.

Q When the conversion resolution signal (Fig. 2d) arrives, the serial code of the information 5 appears at the output of the converter 17 at the parallel code converter 17 sequentially simultaneously with the pulses from the generator 16. This code (Fig. 2g) and pulses from the generator 16 (Fig. 2e) are sent to a level converter 24, which forms a code message (Fig. 2h). From the output of the converter 24 levels, the signal through the modulator 14 and the television cable 5 is fed to the input of the differential amplifier 20. From its output, the signal of additional information is fed to the input of the amplitude selector 21. The pulses from its first output go to block 7

5 control, and with the second (Fig. 2i), the corresponding log. "Oh, and from the third (Fig. 2g), the corresponding log. "I arrive at the element OR 22. At its output, sync pulses are formed (Fig. 2e), which together with the information code and the enable signal from the control unit 7 are fed to the serial to parallel converter 6. After receiving the additional information, the control unit 7 starts the generator 8 and gives permission to convert the parallel code to the serial code converter 9. From its output, the serial code (Fig. 2g together with the pulses of the generator 8 (Fig. 2e) goes to a level converter 19, at the output of which a code message is formed (Fig. 2h). This additional information is via modulator 4, amplifier 1 and a television cable 5 is fed to the terminating resistor 11 and to the input of the amplifier 13.

The exchange of additional information in the absence of a television signal is as follows.

After generation of the information transmission signal by the control unit 7, the generator 8 is started from the output of which the clock pulses go to the parallel-to-serial code converter 9. The serial code of the transmitted information, along with the clock pulses, is fed to the converter of 19 levels, at the output of which a code package is formed.

Then, through the modulator 4, amplifier 1 and TV cable 5, this code package is fed to the input of amplifier 13, ac

him on v.chod amplitude selector 2nd. FIG. 26 the dotted line shows the pulses at its first output, corresponding to the beginning and end of the code message containing additional information. These pulses are sent to an extraction unit 26, which in this case extracts the corresponding code sequence. Further processing of the received signal is no different from that described. If in this code message there is a command in the form of a binary code that information is being transmitted from the indicator side, then the output of the code comparison unit 23 has a signal. By this signal, the control unit 15 starts the generator 16 and permits the conversion of the parallel code to the serial converter 17. From its output, information, at the end of which the transmission end code is contained, through the converter of 24 levels,

0 the modulator 14 and the television cable 5 is fed to the input of the differential amplifier 20, then to the amplitude selector 21, from there to the control unit 7, the OR element 22 and the converter 6

g serial code in parallel. The received parallel code is fed to the code comparison element 18, to the other input of which the end of transmission code is fed. If these codes coincide, the output of the comparator appears in the signal to transmit information, which is fed to the control unit 7.

In this way, additional information is transmitted and transmitted in the absence of a television signal in cable 5.

2

Claims (1)

A DEVICE FOR TRANSMITTING AND RECEIVING ADDITIONAL INFORMATION ON A TELEVISION CABLE, containing on the transmitting side an amplifier, a terminating resistor, one output of which is connected to the input of the amplifier and is the input of the device, the other output of the terminating resistor is connected to the ground bus, the modulator, the output of which is connected to the input of the amplifier the output of which is connected to the input of the television cable, a serial to parallel converter, a control unit connected in series, a pulse generator and a converter The parallel code converter is serial, and on the receiving side, the serial code to parallel converter is a terminating resistor, indicator, amplifier, and modulator, the output of which is connected to the amplifier input, to the indicator input, and to the first output of the terminating resistor, the second output of which is connected to the ground bus, the control unit, the pulse generator and the parallel-to-serial code converter are connected in series, characterized in that, in order to reduce distortion of additional information, a code comparison unit, a level converter and a series-connected differential amplifier, an amplitude selector and an OR element are inputted on the transmitting side, while the output of the parallel code to serial converter is connected to the first input of the level converter, to the second input of which the pulse generator output is connected, while the second and third outputs of the amplitude selector are connected respectively to the first input of the control unit and the first input of the serial converter in parallel the second, second and third inputs of which are connected respectively to the output of the OR element. and the second output of the control unit, the third output and the second input of which are connected respectively to the second input of the parallel code converter into serial and the output of the code comparison unit, whose inputs are connected to the corresponding inputs of the serial code converter to parallel, the amplifier output is connected to the first input _{β of the} differential amplifier, the second input <g of which through the modulator is connected to the output of the level converter, and on the receiving side a code comparison unit, a level converter connected in series with the amplitude selector and the line selection unit, as well as the coincidence unit and the OR element, while the output of the amplifier is connected to the input of the amplitude selector, the first and second outputs of which are connected respectively to the first input of the OR element and to the combined first input of the coincidence unit and the second input OR element, the output of each of which is connected respectively to the first and second inputs of the serial code to parallel converter, the third input and outputs of which are connected respectively to W the output of the control unit, the inputs of the code comparison unit, the output of which is connected to the first input of the control unit, the third output of which is connected to the second input of the coincidence unit, the output of the line highlighting unit is connected to the second input of the control unit, the output of the pulse generator is connected to the first input of the level converter, the second input of which is connected to the output of the parallel converter SU „„ 1172080 to serial code, the output of the level converter is connected to the input of the modulator, and the first output of the control unit I am connected to the second input of the parallel to serial converter.