SU726670A1 - Device for receiving self-synchronizing pulse trains - Google Patents

Description

(54) DEVICE FOR RECEPTION OF SELF-SYNCHRONIZING PULSE SEQUENCES

I

The invention relates to the field of pulsed technology and can be used in digital telemech transmission systems. the actual information used. with self-synchronizing time-interval codes.

A device for receiving self-synchronizing pulse sequences, containing an amplitude quantizer whose output is connected to the first input of the integrator, receives a synchronization signal to the second input of the integrator, the integrator output is connected to the first input of the differential circuit, the second input of which is connected to the generator output, the output of the differential circuit is connected to the input the threshold level generator, output, which is connected to the adjusting input of the amplitude quantizer.

It is also known a device for receiving self-synchronizing pulsed sequences, containing an amplitude quantizer at the input, to the output of which the output of the error signal analyzer is connected, to the control input of which the output of the reference generator 2 is connected,

However, in known devices, the threshold level for receiving self-synchronizing pulse sequences, depending on the average frequency of the random pulse interference, is adjusted cyclically, which reduces the accuracy of the adjustment and, therefore, the noise immunity of receiving information.

The purpose of the invention is to improve the noise immunity of receiving information.

To do this, a device for receiving self-synchronizing pulsed clock, containing an amplitude quantizer at the input, to the control input of which the output of the error signal analyzer is connected, to the control input of which the output of the reference generator is connected, a delay line, a decoder, a reversible counter and converters are connected to the control input. tel code voltage with output

mlituD) () GO kvpktovatel podklyupslg to gummiruyushemu entry reversiviogch-) schetchpkl G1 11o: redstvon (w, l to vychptayuschekgu entry - via the delay line I114yurm dion- nye pyhodt sootvetstvuyuishm which are connected to inputs of decoder outputs n down counter through g.reobrozov - Tejiii code-voltage is connected to the input of the error signal analyzer.

Neither the drawing shows the structural

Electrical diagram of the device for prima self-synchronized pulse sequences.

The device contains an amplitude quantum 1, the output of which is connected to is a delay line 2 and a summing input of the reversible counter 3, the information outputs of the delay line 2 are connected to the inputs of the decoder 4, and its output is connected to the subtractive input of the reverse version 3 whose outputs through the converter 5, the code-voltage is connected to the first input of the error signal analyzer 6, the second input of the analyzer is connected to the output of the reference oscillator 25, and its output is connected to the control output of the amplitude quantizer 1.

Amplitude quantizer 1 is a threshold device with an additional control input to which a signal is given to change the threshold level. Decoder 4 is a set of AND elements, the Analyzer, 6 is a subtracting device that serves to obtain the difference of two voltages. Generator 7 is a source of voltage of a given magnitude.

The device works as follows. A self-synchronizing pulse sequence in a mixture with interference pulses 40 is fed to the input of amplitude quantizer 1. In the initial state, amplitude quantizer 1 establishes an average threshold level corresponding to a given probability of 45 emission emissions F} ,. The adjustment of the threshold level should be carried out in such a way that i compensate for the difference in P between the given probability of noise emissions of the DF.

and the actual frequency of the occurrence of the noise emissions of R. It is known that single-decoding decoding devices for receiving sak / state-synchronized pulse sequences make it possible to more reliably detect information under the influence of interference of large gat-

ie at

T i. - In

- where t (r base time code;

(-, сРЦ1П1Й, the period of random impulse noise.

Also, the average number of interference pulses can be much larger than the average number (} of the impulses during this time), and the average frequency of the information pulses is constant, which makes it possible to make a constant correction to adjust the threshold level.

Amplitude quantizer 1 generates pulses of constant duration and amplitude when the input signal exceeds the threshold level. The pulse sequence formed by the amplitude quantoEM 1 simultaneously enters the input of the delay line 2 and the summing input of the reversing counter 3. From the information outputs of the delay line

2 signals are fed to the inputs of the decoder 4, which performs single-ended decoding of the received self-timed pulse sequence. Decoded by decoder 4 information is fed to the outputs of the device. The pulse sequence from the output of the delay line 2 is fed to the subtracting input of the reversible counter 3. At the initial moment of time, the mixture of information and commercial pulses is fed only to the summing input of the reversible counter

3, and the counting of these pulses begins. After a time delay T, the same pulse sequence arrives but the subtracting input of the reversible counter 3, which from this moment will begin to add and subtract the same number of pulses. So through time

The T content of the reversible counter 3 will stop changing at a constant average frequency of the pulses at the input of the delay line and will correspond to the number of pulses elapsed during the time T, i.e. the average frequency of the pulses at the input of the delay line 2.

Claims (2)

If the average frequency of the pulses at the input of the delay line 2 changes, then the reversible counter 3 will increase its contents with an increase in the average frequency of the pulses, or decrease if this frequency decreases, since the delay time does not change. Thus, the content of the counter continuously monitors the average frequency of the pulses at the output of the amplitude quantizer 1. The binary code from the outputs of the reversing counter 3 goes to the transducer / iTfl inputs of the code and the output, the output of which 4 is organized by a remote section proportional to the average frequency of the pulses at the output of the amplitude quantizer 1. In this case, the voltage at the output of converter 5 of the code-voltage will correspond to the actual frequency of the occurrence of noise spikes with an accuracy of a constant coefficient determined by the average frequency of information pulses, the voltage from the output of the converter 5, the code-voltage goes to one of the inputs of the analyzer 6, the second input of which receives the voltage from the reference generator 7. the reference generator. 7 generates a signal corresponding to the desired value of the noise emission F. The analyzer 6 subtracts from P the final value of R and thus produces a difference signal D-P or an error signal with a corresponding amplitude and sign. This error signal produces a continuous adjustment of the threshold level of the amplitude quantizer 1. Formula of the invention A device for receiving self-synchronizing pulses in series, containing at the input a quantitative quantizer, to the control input of which. The horn of the error signal analyzer output, to the control input of which the output of the reference oscillator is connected, is characterized in that, in order to improve noise immunity, a delay line, a decoder, a reversible counter and a code-voltage converter are input, while the amplitude quantizer is connected to the summing input directly into the reversible counter, and to the subtracting input through the delay line, whose information outputs are connected to the corresponding decoder inputs, and the outputs of the reversible counter through The code-voltage converter is connected to the input of the error signal analyzer. Sources of information taken into account during the examination 1. Kionini L. Method of automatic adjustment of the threshold level in radar. Radioelectronics abroad, 197О, № 11. 2. USSR author's certificate number 161417, cl. H 03 K 9/06, 1964 (prototype).