SU1067608A1 - Signal transmission device - Google Patents

Abstract

1. A DEVICE FOR TRANSMITTING SIGNALS, containing an amplitude modulator on the transmitting side, and on; the receiving side is a weight synchronous demodulator, the control inputs of which are connected to the outputs of the control unit, characterized in that, in order to improve noise immunity, a synchronous modulating voltage driver, the output of which is connected to the input of the amplitude module, is inserted at the transmitting side the torus, and the control inputs of the synchronous modulating voltage driver are connected to the outputs of the control unit .. 2. The device according to claim 1, is designed so that the synchronous modulating voltage driver with It consists of series-connected weighting factors and a switch, and the control inputs and output of the switch are, respectively, the control inputs and output of the synchronous driver, which modulate (Forward voltage. About 05 Oe

Description

The invention relates to communication systems, in particular, can be used for the transmission of electrical information in electrometry. A device is known that consists of (an amplitude modulator on the transmitting side and a synchronous demodulator on the receiving side, in which amplification modulation is used to increase the noise immunity of the transmission of measurement information by applying two-pole pulsed signals to a converter circuit and removing the output pulse amplitude signal and the bridge diagonal. The operation of this device consists in the fact that in the synchronous demodulator two values of the amplitude-modulated signal are stored, a shedacer via a communication channel corresponding to the positive and negative amplitude of the modulating signal and take their difference .til Useful information doubles and the interference occurring in the communication channel mutually destroys. For a constant interference time, the suppression is complete, however, the variable will remain its part corresponding to interference in the time between two fillings. The closest to the proposed is a device for transmitting signals, an amplitude modulator on the transmitting side, and on the receiving side e - weight synchronous demodulator, the control inputs of which are connected to the outputs of the control unit C.2I. However, this device has insufficient noise immunity to time-independent interference. The purpose of the invention is to improve the resistance to wear. This goal is achieved by the fact that in the device for transmitting signals, containing an amplitude modulator on the transmitting side, and on the receiving side a weight synchronous multiplier, the control inputs of which are connected to the outputs of the control unit, on the transmitting cv zone, we introduce a synchronous modulating voltage generator The output of which is connected to the input of the amplitude modulator, and the control inputs of the synchronous modulator of the modulating voltage are connected to the outputs of the control unit. The modulating voltage synchronous driver consists of successively connected weights and a switch, and the control inputs and switch code are respectively the control inputs and the output of the synchronous modulating voltage. FIG. 1 shows a structural electrical circuit of the proposed device; in fig. 2 is a timing diagram of a signal at the output of a synchronous driver of modulating voltage; on fig 3 shows an embodiment of a synchronous modulating voltage driver; in fig. 4 through 6 are embodiments of a weighting factor driver. The device contains an amplitude modulator 1, a weight synchronous demodulator 2, a synchronous shaper 3 of modulating voltage, a control block 4, a shaper 5 weights g switch 6. Shaper 5 contains a source 7 of a reference signal, a block 8 weights, a converter 9 of sequential infoation to parallel, weighting commutator 10, memory block 11, switch 12, memory elements 13-15, for example, keys 16 and 17, decoupling elements 18 and 19, counter 20 half-cycles of the modulation frequency signal m decoder 21, block 22 of synchronous sign change, blocks 23 and 24 of the weighting coefficients, cocmutator 25, block 26 {imputation, reference source 27 and scale blocks 26 and 29. The device works in the following way. The sirnal of the modulation frequency -f is fed to the counter 20 (FIG. 3) of block 4, where the half-cycles of this frequency are counted. At the outputs of counter 20, for example, the binary code of the half-clock signal f, which in the controller 21 is converted into control signals of switches 6 and 12, respectively, of the synchronous driver 3 and of the weight synchronous demodulator 2, appears. According to the control signals from block 4, cocoutter 6 synchronous driver 3 commutes the signals, the prog. (amplitude-proportional weights to the coefficients dr i-r that are generated in the driver 5. From the input of the synchronous driver 3, these signals are sequentially received at times t, -fcj. - trt from the input amplitude modulator 1. The input signal I, the passage through the amplitude modulator 1 is multiplied by these coefficients. The output signal of the modulus modulator 1 is equal to -Am.-AoLni AHf

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Claims (2)

1. DEVICE FOR SIGNAL TRANSMISSION, comprising an amplitude modulator on the transmitting side and a synchronous weight demodulator on the receiving side, the control inputs of which are connected to the outputs of the control unit, characterized in that, in order to increase noise immunity, a synchronous shaper is introduced on the transmitting side modulating voltage, the output of which is connected to the input of the amplitude modulator, and the control inputs of the synchronous shaper of the modulating voltage are connected to the outputs of the control unit. 2. The device according to claim 1, with respect to the fact that the synchronous modulating voltage shaper consists of series-connected weight shaper and switch, and the control inputs and output of the switch are respectively the control inputs and output of syn- g chronic shaper modulating voltage. SU ... 1067608 1067608 ²