SU853813A1 - Command receiving device - Google Patents

Description

one

The invention relates to signal transmission and can be used in communication and telecontrol systems.

A device for receiving commands is known, comprising a receiver, a threshold limiter and a serially connected registration unit, a decoding unit and an execution unit 1.

However, the known device does not provide adaptation to the type of affecting interference.

The purpose of the invention is to increase noise immunity.

For this purpose, a serially connected amplitude modulator, a code-analog converter and a reversing counter, another input connected to the output of the threshold limiter, corresponding to the input of which is connected to the output of the receiver.

The drawing shows the structural electrical circuit of the device for receiving commands.

The device for receiving commands comprises a receiver 1, a threshold limiter 2, an amplitude modulator 3, a code-analogue converter 4, a reversible counter 5, a recording unit 6, a decoding unit 7, and an execution unit 8.

The device {Works as follows.

O Receiver 1 amplifies the received signal, detects it, and transmits it to threshold delimiter 2, where it is compared with the threshold. Threshold limiter performs binary

15 signal quantization, f.e. decides whether or not a single impulse of the stack is received at the moment of arrival of the impulses from the amplitude modulator 3. The sequence

20 such decisions in the form of units (a single impulse of a pack are accepted) and zeros (a single impulse of a pack are not accepted) are fed to the input of block 6 and the summing input of a reversible counter 5.

25 Passing block 6, the information is decoded in decoding block 7 and fed to execution unit 8 for execution. With increasing signal dispersion, accumulation in the reversible counter 5 prevails over

subtraction. The signals from its outputs cause changes in the code-analog converter 4, and this in turn leads to an increase in the voltage amplitude at the output of the code-analog converter 4.

In the amplitude modulator 3, the sync pulses following the pulse frequency in the burst are amplitude modulated by the voltage from the 4 code-analog converter, their amplitude values determine the threshold limiter 2 threshold. at the subtractive input of the reversible counter 5, which causes a reduction in the threshold of the threshold limiter 2. Thus, the threshold of the threshold limiter is adapted to the form Exposure to noise.

The introduction of new elements - threshold limiter 2, amplitude modulator 3, converter 4 codoalogue, reversible counter 5 allows the proposed device to adapt to the state of the communication channel (to the type of interference)

It should be noted that adaptation, by the magnitude of the binary quantization threshold of a signal, can, depending on the type and power of interference, give a very large gain in noise immunity.

Claims (1)

1. USSR author's certificate No. 525254, cl. H 04 L 7/10, 1975 {prototype}.