SU558409A1 - The device pulse-frequency transmission and reception of analog signals - Google Patents

Description

one

The invention relates to radio engineering and can be used to transmit analog signals using radio pulses, spaced apart in frequency intercom systems, as well as in multi-channel communication lines with frequency multiplexing and frequency modulation.

A device of pulse-frequency transmission n receiving analog signals, containing on the transmitting side a frequency-modulated generator connected to an output amplifier, a source of the input signal, its output is connected to the first input of a difference unit and the input of a quantizer on m levels (where m is the number of specified levels quantization), the output of which is connected to the second input of the differential unit, and on the receiving side - a selective amplifier, a step voltage generator, the output of which is connected to the input of the output filter, and the course of the last - with the input of the output filter.

However, the known device has a low bandwidth efficiency and low noise immunity.

In order to increase the efficiency of use of the frequency band and increase the noise immunity to the proposed device of pulse-frequency transmission and reception of analog signals on the transmitting side, ",.,.

den quantizer on - levels (where N -

tp

the number of levels allowed) included

between the output of the difference block and the input

frequency-modulated oscillator, and on

the receiving side is entered sequentially

United block of - filters and block

t

select the maximum signal, and the input

block of - filters connected to the output of t

selective s-silicon, and the output of the maximum signal selection block is connected to the second input of the adder and the input of the step voltage generator.

FIG. Figure 1 shows the structural electrical circuit of the proposed device, the transmitting side; in fig. 2 is the prong side.

The device contains on the transmitting side serially connected source 1 of the input signal, differential unit 2, kvantooL „

vatel 3 on - levels, frequency modulus

The generator 4 and the output amplifier 5. The quantizer 6 on / p levels is turned on by the meleda by the output of the input source and the second input of the difference unit 2. On the receiving side, the device contains

United selective

consistently

-7-0lg

amplifier 7, olk 8 of - filters, olok

t

9 choice of maximum signal generator

10 step voltage, the adder 11 and the output filter 12, and the output of block 9 select the maximum signal is connected to the second input of the adder 11.

The device works as follows.

At the output of the difference block 2, a difference is formed between the input signal and the step signal, which is the result of coarse quantization of the input signal into m levels using a quantizer 6. The difference signal is quantized by a quantizer 3 at

L

- levels and is modulating sigt

for the frequency-modulated oscillator 4. Through the output amplifier 5, the generated imulse-frequency signal is fed to the antenna and radiated. At the receiving side through selective

amplifier 7 and block 8 of - filters taken

This signal arrives at block 9 for selecting the maximum signal, the output signal of which corresponds to the quantized difference signal at the output of quantizer 3 of the transmitting side. By the jumps of the specified signal, corresponding to the transition of the frequency-modulated signal to the melad of the extreme filters

, N,

block 8 of filters, the generator output t

The 10 step voltage produces a step signal corresponding to the signal of the quantizer 6. After summing the indicated signals by the adder 11 and filtering them at the output of the device, the original signal transmitted with the required resolution in L levels is obtained.

The proposed device has the increased bandwidth efficiency and noise immunity.

Claims (1)

1. B. Zabegalov. “Principal features of a communication system with multi-valued modulation. Thesis for the degree of Ph.D. Gorky Polytechnic Institute. A. A. Zhdanova, Gorky. 1971 (prototype).