SU1279078A1 - Cable system for transmission and reception of digital information - Google Patents

Abstract

The invention can be used in telephone communication systems with delta or pulse code modulation. The purpose of the invention is to improve the noise immunity from transient noise of the direction of transmission. The system consists of receiving and transmitting units 1 and 2, each of which contains a corrector 3, a differential system 4, an amplifier 5, a decisive unit 6, a decoder 7, a transceiver 8, an encoder 9, an output signal shaper 10 and a synchronization unit 11. Unit 2, cross-section S, also contains a temporary discriminator 12 and generator 13, which controls the voltage. 2 Il. ND WITH o 00

Description

The invention relates to telecommunications and can be used in telephone communication systems with delta or pulse code modulation.

The aim of the invention is to increase the noise immunity from transient noise of the transmission direction.

Fig. 1 shows a structural electrical circuit of the cable system.

Transmitting / receiving unit 1 of sequence 2 generates two antiphase meander sequences i 8 and e, Sequence 8 determines the intervals of processing-signal 2 by decisive block 6 and decoder 7, and its antiphase sequence e is the intervals of occurrence of single characters coming in transmitting and receiving digital information from the aero 9 through the generator 10; Fig. 2 illustrates stress plots showing the operation of the cable system. Cable system for transmitting and receiving digital information contains. the first and second transmitting and receiving units 1 and 2, each of which contains a corrector 3, a differential system 4, an amplifier 5, a decisive unit 6, a decoder 7, a transceiver 8, an encoder 9, an output signal shaper 10

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of the transceiver unit 1. Thus, the transitional interference from single symbols of the EHS sequence, which penetrates through the differential system 4 to the input of the USB 5, does not fall into the processing interval of the reception signal 2. Thus, in the first transceiver unit 1 protection of the reception direction against transmission direction interference noise is provided. The signal at the output of the first receiving and transmitting unit. 1 occurs through differential system 4 and corrector 3, cable chain, correct

and a synchronization unit 11, and the second transceiver block 2 also contains a time discriminator 12

and a generator 13 controlling the voltage, c 3 and the differential system 4 of the second transceiver

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by

The cable system for transmitting and receiving digital information works as follows.

The generator 13 generates two opposite of phase basic clock clock pulses 6 (and S (FIG. 2). Sequentially, S from the inverted output of the generator 13 controls the operation of the shaper 10 of the second transceiver unit 2, the output of which is 35 according to the signals from the transceiver 8 and the encoder 9, an output signal appears, one of the possible implementations of which is represented in the diagram. Sequence 6 through the differential system 4 and the equalizer 3 of the second transceiver unit 2, the cable circuit, the corrector 3 and the differential system 4 of the first transmitting and receiving unit 1 is fed to the input of the receiving direction amplifier 5. After correcting and amplifying the signal in the first receiving and transmitting unit 1, the pulses are at the inputs, the decider 1, and its block 6 and block 11 have the form shown in 2, and are relatively

sequences a, and B with a shift equal to the half-interval interval, so that the interference from pulses of the opposite direction of transmission, penetrating through the differential system 4, does not interfere with the reception (processing) of sequence 2, Block 1I of the first

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2, diagram J, roll 11 of the second transmitter and receiver unit 2 from sequence j produces a meander sequence, the phase of which is constantly compared with the position of the pulses of the sequence Q ;, . from the direct output of the generator 13 using the temporary discriminator 12 "the control signal (on advancing or lagging) of impulses of the sequence m from the sequence and is fed to the control input of the generator 13 and accordingly adjusts its frequency (phase).

Claims (2)

The invention relates to telecommunications and can be used in telephone systems with delta or pulse-code modulation. The aim of the invention is to improve the noise immunity from transient noise of the direction of transmission. Figure 1 shows a structural electrical circuit diagram of a cable system for transmitting and receiving digital information; Fig. 2 illustrates stress plots showing the operation of the cable system. Cable system for transmitting and receiving digital information contains. The first and second transmitting and receiving units 1 and 2, each of which contains a corrector 3, a differential system 4, an amplifier 5, a decisive unit 6, a decoder 7, a transceiver 8, an encoder 9, an output signal generator 10 and a synchronization unit 11, and a second transceiver block 2, in addition, contains a temporal discriminator 12 and a generator 13, which controls, for example, the cable system for transmitting and receiving digital information works as follows. The generator 13 generates two oppositely generated clock sequences of 6 pulses (and S (FIG. 2)) In succession, S from the inverted output of the generator 13 controls the operation of the shaper 10 of the second transceiver unit 2, the output of which, in accordance with the signals from the transceiver 8 and an encoder appears in the output signal, one of the possible implementations of which is represented in the diagram. Sequence 6 via the differential system 4 and the equalizer 3 of the second transceiver unit 2, the cable circuit, the equalizer 3 and the differential The system 4 of the first transmitting / receiving unit 1 is fed to the input of the receiving direction amplifier 5. After correcting and amplifying the signal in the first receiving and transmitting unit 1, the pulses; at the inputs, 1, its block 6 and block 11 have the form shown in diagram 2, and are located relative to sequences a and b with a shift equal to the half-cycle interval, so that the interference from pulses of opposite transmission direction, penetrating through the differential system 4, does not interfere with the reception (processing) of sequence 2, Block 1I of the first transceiver The traveling unit 1 of sequence 2 generates two antiphase meander sequences 8 and e, sequence 8 determines the processing intervals of signal 2 by decisive unit 6 and doder 7, and the antiphased sequence is the interval of occurrence of single characters entering the communication line with 9 through the driver 10 of the first transceiver unit 1. Thus, the crosstalk from single symbols of the EHS sequence, penetrating through the differential system 4 to the input of the usi gigi 5, does not fall into the signal processing interval ala reception 2. In this way, in the first transceiver unit 1, the reception direction is protected from crosstalk interference of the transmission direction. The signal at the output of the first receiving and transmitting unit. 1 occurs through the differential system 4 and the equalizer 3, the cable circuit, the equalizer 3 and the differential system 4 of the second receiving and transmitting unit 2 and at the exit of the amplifier 5 takes the form and time shown in figure 2, diagram J, roll 11 of the second receiving and transmitting unit 2 from sequence j produces a meander sequence, the phase of which is constantly compared with the position of the pulses of the sequence Q;,. from the direct output of the generator 13 using the temporary discriminator 12 "the control signal (on advancing or lagging) of impulses of the sequence m from the sequence and is fed to the control input of the generator 13 and accordingly adjusts its frequency (phase). Claims The cable system, the transmission and reception of digital information, containing the first and second transceivers; blocks, of which contains a series-connected equalizer and a differential system, the output of which is through a serially connected amplifier, a decisive unit and a decoder is connected to the input of the transceiver, the output of which is connected via a serially connected encoder and output device to the input of the differential system, as well as a unit synchronization, the input of which is connected to the output of the amplifier. the clock input of the encoder is combined with the clock input of the output signal generator, and the clock input of the decoder is combined with the clock input of the decision unit, and in the first transceiver unit the direct output of the synchronization unit is connected to the clock input of the decoder so that, in order to increase the noise immunity from transient noise of the transmission direction, the time transducer and generator connected in series are inserted into the second transceiver unit voltage, the direct output of which is connected to the synchronization input of the decoder and to the first input of the time discriminator, the second input of which is connected to the output of the synchronization unit, and the inverse output of the voltage controlled oscillator, at the first reception - the transmitting unit inverse output of the synchronization unit is connected to the clock input of the code ra. .ZHP.