SU649173A1 - Device for transmitting and receiving additional image through television cable - Google Patents

Description

(54) DEVICE FOR TRANSMISSION AND RECEIVING ADDITIONAL INFORMATION ON A TELEVISION CABLE

the first input of the differential step is connected, the second control output is connected to the second input of the parapled code converter into a continuous one, and the third control output output is connected to the third input of the serial iodine converter into the parallel one, and a matching unit is entered on the receiving side, the serial code converter is parallel to and serially connected line selection block, control block, first impuls generator, parallel code converter to, successively The second and second pulse generator, the output of which is connected through an amplifier to the input of the Line selection block and to the first match input, to the second input of which the second output of the control unit is connected, and the output of the coincidence block is connected to the first input of the serial to parallel converter, the second and third inputs of which are respectively connected to the third output of the control unit and the output of the first pulse generator, while the fourth output of the control unit is connected to the second input of the converter p arallel code in serial.

FIG. I depicts a structural electrical circuit of the proposed device; in fig. 2 - timing diagrams for the CH5 operation of the device.

A device for transmitting and receiving additional information via a television cable contains, on the transmitting side, a parallel-code-to-forward converter 1, a co-resistor 2 connected to the input of amplifier 3 and to the first input of differential amplifier 4, and the output of amplifier 3 is connected to the input of television cable 5 and to the second input of the differential amplifier 4, and on the receiving side - a terminating resistor 6 connected to the output of the television cable 5, to the input of the indicator 7 and to the input of the amplifier 8, on the transmitting On the side, the converter 9 of the optional code is entered in parallel, two generators 10, 11 pulses and a control unit 12, the output of the differential amplifier 4 is connected to the first input of the serial code converter 9 in an allele pair and through serially connected control unit 12, the first

pulse generator 1O to the second input of converter 9 of serial code b is parallel and to the first input of converter 1 of a paragain code into a serial one, the output of which through a second generator 11 of pulses is connected to the first input of differential amplifier 4, while the second output of the control unit 12

connected to the second input of the converter 1 of the parallel code to serial, and the third output of the control unit 12 is connected to the third input of the converter 9 a sequence

code in-parallel, and on the receiving side entered a block of matches 13, the converter 14 of the serial code into a parallel and serially connected block allocation 15 lines,

control unit 16, first impedance generator 17, parallel-to-serial converter 18, and second impulse generator 19, the output of the coil, through amplification 8, is connected to the input

Bpok selection 15 lines and to the first input of the block matches 13, to the second input of which is connected the second output of the control unit 16, and the output of the block of matches 13 is connected to the first input of the serial code to parallel converter 14, to the second and third input of which the third output of the block is respectively connected control 16 and the output of the first oscillator 17 imps, while the fourth output of the control unit 16 is connected to the second input of the parallel-to-code converter 18. The device works by

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The full video input signal from the input is via cable 2O, amplifier 3 and TV cable 5 passes to indicator 7. At the same time, it goes through amplifier 8 to the allocation unit 15 lines. This system uses the allocation of one of the 25 lines of each half-frame, for which information is not transmitted, since these lines fall on the reverse frame sweep.

Claims (1)

FIG. 2a shows the shape of the ampoule of the n lines. Pulses start with a relatively long horizontal sync pulse. This pulse is extracted by the allocation unit 15 and starts up the control unit 16, providing the necessary sequence of operation of the other units. After start-up (Fig. 26), control box 16 generates a pulse triggering the first generator 17 (Fig. 2c). At the same time, the output of the control unit 16 (Fig. 2d) produces a trigger pulse for the converter 18, which converts the input parallel code into a sequence of short impuls (Fig. 2e). With the help of the second generation 19, these pulses are kneaded into the television signal. At the receiving side, the differential amplifier 4 suppresses the video signal, since it is in-phase for it. However, the current pulses create a voltage only at the output of the amplifier 3 and do not pass to its input. Therefore, they are an antiphase signal and are distinguished by differential clamp 4 (Fig. 2k). The first current pulse - the start pulse - starts the control unit 12. The pulse start of the converter 9 is removed from one of its outputs (Fig. 2 and), and the pulse from the other starts up the first generator 10 These pulses and pulses from the output of the differential amplifier 4 are sent to the converter 9 On the following clock cycle, the control unit 12 starts the converter 1 (Fig. 2n), the pulses from its output using the second generator 11 are kneaded into the video signal and nej are given. Here they come through the amplifier 8 to the input of the block matches J3. At its / fugue input (Fig. 2e), a long pulse is received from the output of the control unit 16. As a result, the output block (Fig. 2g) of the coincidence block 13 is allocated only the progressive code transmitted from the reception of the party. It comes along with the trigger pulse (Fig. 2 h) and pushing it towards the converter 14. Thus, in the proposed device, compared with the known distortion, it is much less. Apparatus of the Invention A device for transmitting and receiving additional information via a television cable, comprising, on the transmitter side, a parallel code converter to a serial matching resistor connected to the input of the amplifier and to the first input of the differential amplifier, and the output of the amplifier is connected to the input of the television cable and to the second input differential amplifier, and at the receiving side - a terminating resistor connected to the output of the television cable, to the input of the indicator and to the input of the amplifier, which is This is due to the fact that, in order to reduce distortions, a converter of a coupling code into a parallel one, for a pulse generator and a control unit is inserted on the transmitting side, while on the transmitting side the output of the differential amplifier is connected to the first input of a serial code to parallel converter and through series-connected control unit. laziness, the first pulse generator. To the input of the converter of a coded parallel to parallel code converter and to the first input of a parallel code converter to a serial one, the output of which is connected via a second pulse generator to the first input of the differential amplifier, while the second output of the control unit is connected to the second input of the converter. parallel code to the serial, and the third output of the control unit is connected to the third input converter of the serial code to the parallel one, and a block of matches is entered on the receiving side , a serial to parallel converter and a serially connected line selection unit, a control unit, a first pulse generator, a parallel code to serial converter and a second pulse generator, the output of which is connected through an amplifier to the input of the line selection unit and to the first input of the coincidence unit, to the second input which is connected to the second output of the control unit, and the output of the coincidence block is connected to the first input of the serial to parallel converter, to the second third input which are respectively connected the third output of the control unit and the output of the first pulse generator, the fourth output podklk chen control unit to the second input transducer parallel to serial. Sources of information taken into account in the examination. 1. US patent No. 36912 5, CP. 178/58, 12.O9.72. 1; -: l-, i, .., ..: .., - / -. rHty Xi . ... -. i., nS- i; iij, O l. AwA;, -.--- - - 649173 one q + ij f II III