SU849463A2 - M-sequence generator - Google Patents

Description

(54) M-SEQUENCE GENERATOR

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The invention relates to a pulsed technique, in particular to the class of pseudo-random signal generators and can be used in devices for optimal signal processing.

According to the main author. St. No. 362449 is a known M-sequence generator comprising ring distributors made on symmetric multiphase multivibrators with multiple output pulse following frequencies, the corresponding outputs of the distributors are connected to the inputs of the OR elements, at the outputs of which the required pulse sequences are formed.

This generator provides pseudo-random signals of any kind, including M-sequences 1.

However, obtaining shifted one relative to another for a time that is a multiple of the duration of an elementary pulse of M-sequences in this generator is impossible.

At the same time, the use of pseudo-random pulse signal generators in the equipment for optimal signal processing, identification systems, in the development of electronic equipment with increased noise immunity, etc., implies the formation of M-sequences shifted relative to the original by time intervals smaller than the repetition period M-sequences, and especially for time intervals, are multiples of the duration of the elementary impulse of the M-sequence.

The purpose of the invention is to extend the functionality by obtaining

Q shifted copies of M-sequences.

The goal is achieved by the fact that a generator of M-sequences containing symmetric mutually synchronized multiphase multivibrators with

15 times the pulse frequency of the output pulses, each output of which is connected to the corresponding inputs of the OR elements, a pulse shaper, two delay lines with taps and triggers, the first and second inputs of each of the

20 of which are connected to the corresponding taps of the first and second delay lines and the inputs of the delay lines are connected to the outputs of the pulse former, the input

which is connected to the output of one of the elements OR.

The drawing shows the functional diagram of the generator.

The generator contains multiphase multivibrators 1, symmetric, mutually synchronized with multiple pulse frequency, element 2 OR, pulse shaper 3, delay lines 4 and 5 with taps and triggers 6.

The generator of the M-sequence works as follows.

When supplying voltage in multiphase multivibrators 1, pulse distribution modes occur. Due to the fact that multiphase multivibrators 1 synchronize each other, their output oscillations are distributed in time in a strictly definite way, and due to the symmetry and frequency multiplicity of the generated oscillations, the pulse duration at all outputs of the multiphase multivibrators 1 turn out to be the same.

Pulses from the outputs of multiphase multivibrators 1 are fed to the elements 2 OR, at the outputs of which, depending on the need, you can get different code combinations distributed in time and space.

The output signal from the output of the OR 2 element is fed to the input of the imaging unit 3, and the input of the imaging unit 3, depending on the need to obtain certain time-shifted M-sequences, can be connected to the output of any of the OR elements 2.

Shaper 3, containing for example a differentiating unit, selects with it the moments of transition of an M-sequence from logical "1 to logical" O and vice versa and generates at its first output pulses corresponding to moments of transition from logical "O to logical" 1 in M -sequences, and at the second output - the pulses corresponding to the moments of transition from logical "1 to logical" O in the M-sequence. These pulse sequences are fed to the inputs of delay lines 4 and 5,

which are made in the form of open-ended ring structures, which are open-ended multiphase pulse generators with a number of phases equal to the number of required delay elements N, and operating

in the pulse distributor mode. The duration of the pulses formed at the outputs of the ring structures must be equal to the duration of the time interval for which it is necessary to delay

M-sequences are relative to each other.

In this case, the duration of the pulses formed at the outputs of the ring structures, and, accordingly, the delay interval of the M-sequences, is equal to the duration of the elementary pulse in the M-sequence.

From the taps of the delay lines 4 and 5, the output pulses are fed to the corresponding inputs of the flip-flops 6, from the outputs of which the M-sequences are taken,. delayed in time, respectively, by 1, 2, 3 ..., i, ... N durations of the elementary impulse of the M-sequence.

Thus, the proposed generator allows one to obtain all

time one relative to another for the duration of the elementary pulse of the M-sequence.

Claims (1)

Invention Formula The generator of the M-sequence auth. St. No. 362449, characterized in that, in order to extend the functionality, a shaper J pulses are introduced into it, two delay lines with taps and triggers, the first and second inputs of each of which are connected to the corresponding taps of the first and second delay lines, and the inputs of the delay lines connected to the outputs of the pulse former, the input 0 of which is connected to the output of one of the OR elements. Sources of information taken into account during the examination 1. USSR Author's Certificate No. 362449, cl. H 03 K 5/156, 05.04.71.