SU1499443A1 - Pseudorandom sequence generator - Google Patents

Abstract

The invention relates to a pulse technique. The purpose of the invention is to improve the accuracy of the formation of the sequence. This is achieved by linking its pulses to the 6 pseudo-random number generator codes, which determine the code-time interval for the converter 4, and also due to the high precision of the formation of the sequences by the driver 2 of the pulse sequences. The diagram also shows the periodic signal generator 1, the switch 3, the pulse counter 5, the one-shot 7, the program block 8, the delay element 9, the pulse shaper 10. 1 hp f-ly, 2 ill.

Description

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The invention relates to a pulse technique and can be used in computing.

The aim of the invention is to increase the accuracy of sequence formation.

FIG. 1 is an electrical block diagram of a pseudo-random sequence generator; in fig. 2 is an electrical circuit of a pulse sequence maker.

The pseudorandom sequence generator contains (FIG. 1) a periodically connected periodic signal generator 1, shaper sequence generator 2, switch 3, code 4 converter — time interval, pulse counter 5 and pseudorandom number generator 6, one-shot 7, program block 8, outputs which is connected to the control inputs group of the switch 3. The input of the program block 8 is connected to the input of the pulse counter 5, the output of which is connected to the input of the one-vibrator 7, the output of which is connected to the output Control converter 4 code is a time interval, a group of information inputs of which are connected to the outputs of a pseudo-random number generator 6, and the one-oscillator 7 contains sequentially connected delay element 9 and shaper 10 pulses. The shaper 2 of the pulse sequences (Fig. 2) contains the second amplifier 11, delay line 12, group 13 of the pair of paraparators 13, 13ZI and the first amplifier 14. The direct and inverse outputs of the first and second amplifiers 14 and 11 are connected to the corresponding inputs of the comparators 13g of group 13 , the corresponding outputs of the comparators 13. | - 13 of which are the drivers of the pulse generator 2 generator, the input of which is connected to the input of the first amplifier 14 directly, and to the input of the second amplifier 11 through a delay line 12.

The generator works as follows.

A periodic signal generator 1 generates periodic oscillations (triangular or sinusoidal) with quartz frequency stabilization, which are fed to the driver 2 pulse sequences, where n equal pulse sequences are formed with a period equal to the input signal period, but shifted relative to each other by time less than the period of the input periodic signal. These n pulse sequences are received at the information inputs of the switch 3. The signals from the outputs of the software block 8 control-. the operation of switch 3 is such that its output will be one of the pulse sequences. When pulses of this sequence arrive at the clock input of the converter 4 code - time interval, a time interval is formed, which is proportional to the code of the 6 pseudo-random number generator, which arrives at the information inputs of the converter 4 code - time interval.

Each time interval from the output of the converter 4 code time interval. Enters the input of the program block 8 and leads to a change in its output signal so that, in accordance with it, at the output of the switch 3 there will be a different pulse sequence that is out of phase with respect to the previous one .

The output pulses of the 4-code-time converter are counted by a pulse counter 5, which produces an output pulse that arrives at the input of the pseudo-random number generator 6, resulting in a binary number at its output. The output impulse of the counter 5 impulses arrives at the input of the one-oscillator 7, which absorbs the impulse of entering the new code with the generator - 6 pseudo-random numbers into the converter 4; the code is the time interval.

Thus, the output of the device receives pulses, the intervals between which are determined by the generator code 6 of pseudo-random numbers and are known, and the time shift between adjacent pulses depends on the generated time shift between the pulse sequences obtained in the driver 2 of the pulse sequences.

Consider the work of the generator 2 pulse sequences (Fig.2) for example, when, and the output signal of the generator 1 of the periodic signal is a periodic signal of a triangular shape.

At the input of the generator 2 pulse sequences, i.e. the inputs of the amplifier 14 and the delay line 12, receives a periodic signal of a triangular shape. The signal from the output of the delay line 12 is delayed by 1/2 of its iriod with respect to the input, is fed to the input of amplifier 11. As the signals are taken from the direct and inverse outputs of amplifiers 14 and 11, a chain of periodic signals are formed that are shifted relative to each other by 1/4 period of the input periodic signal. From the direct output of amplifier 14, the signal goes to the inverted inputs of the comparator and 132, from the inverted output of amplifier 14 to the inverted inputs of the comparators 13 ,, and 13, from the direct output of amplifier 11 to the inverted inputs of comparators 13 and 13g, and from the inverse output amplifier 11 - is fed to the inverse inputs of the comparators 13d. The reference inputs + U are applied to the direct inputs of the comparators 13,}, the reference voltage is set at the direct inputs of the comparators 13g - U, and the zero potential is written to the direct inputs of the comparators 13j, 13, 135-.

The moments of excess of the reference levels by the input signal are fixed by the corresponding comparators, on the output of which the level of a logical unit appears.

At the outputs of the Comparators 13, we obtain shifted pulse sequences with a time shift between them (Fig. 3v)

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O is the period of the input periodic signal; n is the number of generated impulses

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Thus, in the device, it is possible to form a pseudo-random pulse sequence, in which the moments of the appearance of pulses are strictly defined on the time axis, i.e. increased the accuracy of the formation of the sequence, as well as the time shift between pulses was made less than the period of the clock frequency generation.

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Claims (2)

Invention Formula one . A pseudo-random sequence generator, comprising a periodic signal generator, a pulse counter and a software block, characterized in that, in order to improve the accuracy of the sequence formation, a pulse shaper of the sequences is entered into it,. the switch, the code-time converter, the pseudo-random number generator and the one-shot, the input of which is connected to the input of the pseudo-random number generator and the output of the pulse counter, the input of which is connected to the input of the program block and the output of the converter the interval, the control input, the group of information inputs and the clock input of which are connected respectively to the one-shot output, the pseudo-random number generator outputs and the switch output, the group of control inputs and the group of information inputs of which are connected respectively to the outputs of the program block and the outputs of the pulse generator of the sequences that are connected to output of a periodic signal generator. 2. Generator pop. 1, characterized in that the pulse sequence generator contains a delay line and two amplifiers, the forward and inverse outputs of which are connected to the corresponding inputs of the group comparators, whose corresponding outputs of the comparators are the codes of the pulse sequence generator, the input of which is connected to the input first amplifier directly, and with the input of the second amplifier through the delay line. approach Outputs