SU828434A1 - Discrete signal receiving device - Google Patents

Description

one

The invention relates to radio engineering and can be used in binary information receivers of session communication systems and telecontrol.

A device for receiving discrete signals is known, comprising a serially connected binary signal generating unit, a decoder, a valve to the second input of which the output of the threshold unit is connected, the input of which is connected to the output of the counter, to the input of which the output of the channel quality detector is connected

v However, this device has insufficient noise immunity.

The purpose of the invention is to improve noise immunity.

For this purpose, two random voltage conversion units and a comparison unit, the output of which is connected to the input of the channel quality detector, are introduced into the device for receiving discrete signals, and the corresponding outputs of the binary signal conditioning unit are connected to the inputs of the random voltage conversion units, the outputs of which are connected to the inputs block comparison.

The drawing shows a structural electrical circuit of the proposed device.

The device for discrete signal iriem comprises a binary signal generating unit 1, a decoder 2 and a valve 3, a threshold unit 4, a counter 5, a channel quality detector 6, two random voltage conversion units 7 and 8, a comparison unit 9 and an actuator 10.

The device works as follows. A random signal, which is a noise or a mixture of a signal with noise, is fed to the input of block 1, where the coherent processing of the received signal is performed. As a result, at the outputs of block 1, random voltages are generated, the values of which are distributed according to the normal law. The voltages from the outputs of block 1 are fed to the inputs of blocks 7 and 8, where they are converted into unipolar, with a normal distribution of the module. From the outputs of blocks 7 and 8, the transformed random voltages are fed to block 9, which operates according to a difference algorithm. The difference of the unipolar voltages goes to the input of the detector 6, where the unreliable elements of the code combination are detected, which are fed to the counter 5. The erasure number recorded in one combination by the counter 5 is compared with the threshold value of the erasures in the threshold block 4. If the number fixed erasures will be less than the threshold value, then

the valve 3 is closed, and the information from the decoder 2 is supplied to the actuator 10. Otherwise, the valve 3 is opened, and the decoder 2 "is cleared from the code combination.

The use of the invention makes it possible to increase the noise immunity of the device for detecting signals from registering false commands in the pauses between communication sessions when coherently receiving binary signals.

Claims (1)

Invention Formula An apparatus for receiving discrete signals comprising a serially connected binary signal generating unit, a decoder and a valve, to the second the input of which is connected to the output of the threshold unit, the input of which is connected to the output of the counter, to the input of which is connected the output of the channel quality detector, characterized in that, in order to increase the noise immunity, two random voltage conversion units are introduced and a comparison unit whose output is connected to the detector input the quality of the channel, while the corresponding outputs of the binary signal generation unit are connected to the inputs of the random voltage conversion units, the outputs of which are connected to the inputs of the comparison unit. Sources of information taken into account during the examination 1. USSR Author's Certificate No. 350195, cl. H 04L 7/10, 1970 (prototype).