SU1019660A1 - Device for transmitting and receiving binary with frequency modulation - Google Patents

Abstract

SYSTEM PERIODE.CHI AND TRANSMITTING SIGNALS WITH DUSTABLE MODULATION / doflepjfciaiaaH on 11 the transmitting side of the modulepower and midrange modulator and generator. by the reception side, the successively connected filter amplifier and the first amplitude detector, which is intended to increase the reception side of the receiver, are placed on the forward side. The following are connected synchronously to the selector switch. Tactic generator, And, the second input of which is connected to. the sync pulse selector input is a counting trigger and an analog integrator, the output is connected to the input of the Trr module, and the serially connected transducer in and yes (modulation, second amplitude detector, inverter, element. And, the first input of the controller is connected to the second input of the first amplitude detector, and pulse shaper; while the output of the amplifier is connected to the input of the modulation-type transducer.

Description

WITH

with

FIG. 1 The invention relates to telecommunications engineering and can be used for transmitting and receiving binary signals with frequency modulation. Lime is a transmission system and reception of binary signals with frequency modulation, containing on the transmitting side a series-connected modulator and generator, and on the receiving CTOpoFie series-connected filter, amplifier, and first amplitude detector. However, the system has a very low reception accuracy. The purpose of the invention is to increase the reception quality. The goal is achieved in those in the transmission and reception systems of dual frequency-modulated signals, which are transmitted on the transmitting side not connected to the modulator and generator, but on the receiving side are connected in series with JG and |) Il , the amplifier and the first amplitude detector, on the transmitting side, a serially connected selector clock pulses are introduced, a clocking generator, an element I, the second input of which is connected to the input of the selector clock pulses, the counting trig ep and analog integrator zzyhod which is connected to the input of the modulator, and on the receiving watchman administered serially connected inverter type modulation, the second amplitude detector, an inverter, an AND, to Auto. To the input of which the first amplitude detector is connected, and the pulse shaper, this input of the amplifier is connected to the input of a mode type driver: (Fig. 1; FIG. 1 shows a structural electrical diagram of the proposed system; FIG. 2: Diagrams of Fig. 3 - Amplitude-frequency characteristic of a modulation type transducer. A system for transmitting and receiving binary signals with frequency modulation contains on the transmitting side 1 tacho-round dongle 2, an ele- mental, and a counting trigger. The new integrator 5, modulator b, göner.tor 7 and selector sync pulses 8, and on the receiving side 9 - converter 10 VAD modulation, the first and second amplitude detectors 11 and 12 pp.; o; respectively, the inverter. 13, element 14, pulse generator 15. Filter 16 and amplifier 17.; The system operates as follows OMI. Transmitted message E (FIG. 2 is transmitting; side 1 is cut by the clock selector 8 (FIG. 1) to the clock synchronization input of generator 2 which produces pulses with a time interval equal to the duration of the parcel . Of these pulses, the first element And 3 selects only those that coincide with the unit ones, as a result, with the arrival of a single unit, the counting trigger 4 changes the state to the opposite state, and does not work for zero samples. At the same time, at the output of the analog interrator 5, the voltage E (Fig. 26) will change with the transmission of single parcels and remain at zero shipments. By means of the modulator 6, according to the law Eg, the frequency f of the generator 7 will change. From the voltage plots (Fig. 2), it can be seen that when transmitting single parcels (logical units), the frequency f changes in any direction between its two. with discrete values of g 1 when transmitting zero bursts, any of these values remains unchanged. Since the envelope f (Fig. 2c) is free of any jumps, the frequency spectrum of the transmitted message is narrower than in the known device, where the law of frequency variation repeats the message, saving the jumps. V. result; The filter 16 can be made narrower to increase the signal-to-noise ratio in order to increase the reliability of reception. At the receiving side 9, the signal, having passed the filter 16 and the amplifier 17, is supplied to the converter 10, the frequency-response characteristic of which is shown in FIG. 3. The tuning frequency j of the converter 20, at which the transmission coefficient K vanishes, is aligned with the average filter setting .16. In this case, in the case of transmitting zero bursts, the oscillator is applied to the converter 10 for a constant one of the frequencies, or, because of which its output voltage is different from zero. When transmitting a single parcel, the frequency, varying within f -: f2, will pass through the tuning frequency f, the converter, and the output voltage of the latter will go through zero discharge. This feature is used to distinguish single and null parcels. The output voltage of the converter 1.0 is detected by the second amplitude detector cm 12 and through the inverter 13 is supplied to one of the input element I 14. At the output of the inverter 13, if there is a signal, the voltage will be zero in the case of frequency constant, i.e. when transmitting zero parcels. If a single dressing is transmitted, then the output voltage of the inverter 13 will go through a single value .. The first amplitude detector 11, monitoring the presence of the signal, will provide the unit voltage at the other input of the element 14 as well, thereby triggering the pulse generator 15, registering a single parcel. Thus, the system, being free from narrow-band oscillatory circuits, provides a higher speed. In addition, since the information is incorporated in the frequency change, the transient-processes time in the receive filter is used efficiently, which further increases the throughput, i.e. reliability increases with increased transmission speed.

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Claims (1)

TRANSMISSION AND RECEIVING SYSTEM ’BINARY SIGNALS WITH FREQUENCY MODULATION, 'containing on the transmitting side a series-connected modulator and generator, and on the receiving side a series-connected filter, amplifier and first amplitude FIG. 1 8 -9*- 7 & 3 g ——> from - A tedious detector, which is distinguished by the fact that, in order to increase the reliability of reception, on the transmitting side, sequentially connected clock pulses are introduced. a clock generator, element And, the second input of which is connected to the input of the clock selector, a counting trigger and an analog integrator, the output of which is connected to the input of the Modulator, and on the receiving side are connected in series a converter of the type of modulation, a second amplitude detector, an inverter, element I., to the second input of which the output of the first amplitude detector and the pulse shaper are connected, while the output of the amplifier is connected to the input of the modulator type converter, ““ Г I I at to 7 -a I I I I-j