SU381076A1 - DEVICE FOR FORMING IL / RULES - Google Patents

Description

one

This invention relates to specialized devices for analyzing random processes.

In known devices, differential blocks, comparison circuits, and pulse shapers are used to analyze the distribution of the durations of the time intervals between extremes. This leads to increased errors due to imperfect differentiation of wideband random processes.

Analog-digital devices that solve the task, as a rule, have a significant amount of equipment.

The purpose of the invention is to improve the accuracy of work compared to the analog prototype and simplify the device compared to analog-digital.

This goal is achieved due to the fact that the proposed device contains a serially-connected pulse-width modulator, a first and second one-shot, an anti-match circuit, a trigger and a match circuit connected by inputs to the first and second) one-shot, and output to the second trigger input. The second input of the anti-coincidence circuit is connected to a pulse width modulator.

The block diagram of the device shown in the drawing.

The device contains a pulse-width modulator (PWM), one-shot 2, 3, anti-match 4 and match 5 schemes, trigger 6 and time pulse analyzer 7. The device operates as follows.

The process under study is quantized in time with such an interval that the derivative of the process inside it is constant. In this case, the increment sign of the function determines

to the derivative, and the moments of change of the sign correspond to the extreme points.

A random process enters modulator 1, where a sequence of impulses modulated by duration is converted

(the duration of these pulses is determined by the instantaneous value of the random process B, the instant of starting the PWM of consecutive clock pulses). The falling edge of the PWM pulses is delayed by two single vibrators 2 and 3 for a time equal to the period of the triggering pulses Tn and is compared with the temporal position of the falling edge of the next PWM pulse.

The need to divide the delay TP into

Two privately caused by the following. In the case when the derivative of a random process is negative, each subsequent pulse of PWM is shorter in duration than the previous one. Therefore, when only one multivibrator is used as a delay device, by the time the triggering pulse appears, the multivibrator is not ready to trigger, as it has not finished generating a pulse with a duration Tn from the previous PWM pulse. When separating the delay of the trailing edge of the PWM pulses, the two parts can be selected by the duration of the pulse produced by the multivibrator 2 so that it ends before the trailing edge of the subsequent PWM pulse appears. Based on the above features of the operation of the device for the falling edge of the PWM pulse, the pulse duration of the multivibrator 2 must be chosen from the condition:

,(one

where TI is the pulse duration of the multivibrator 2;

Cmin - the minimum interval between adjacent pulses of PWM;

Atmax - the maximum change in the duration of adjacent pulse PWM. The comparison of the temporal position of the trailing edges of the previous and subsequent PWM pulses is carried out using temporal circuits 4 - l 5.

The anti-match 4 is a key that is locked in its initial state. The impulse PWM incoming to the key is opening, the impulse of one-shot 3 is closing. If the condition (1) is satisfied, the pulse of the multivibrator 3 starts always before the pulse of the PWM pulse, and with a positive derivative of the random process it ends earlier than the pulse of the PWM pulse. Therefore, the pulses at the output of circuit 4 appear only when a positive derivative of a random process is received at the input of a trigger operating in a separate start mode.

In the case of a negative derivative of the process, the pulses of the multivibrator 3 begin earlier and end later than the PWM pulses, completely overlapping them in time. Scheme 4 is closed. The pulses of the one-shot 3 end later than the pulses of the one-shot 2 begin, i.e. they overlap in time. When these pulses arrive at the coincidence circuit 5, pulses arriving at the second input of trigger 6 appear at its output.

The residence time of a trigger in one position or another determines the duration of the intervals between adjacent extremes of a random process: between adjacent minimum and maximum, between adjacent maximum and minimum.

Subject invention

A device for generating pulses 5 with durations equal to the intervals between adjacent extremes of a random process, containing a coincidence circuit connected to the first trigger input, and an anti-coincidence circuit that connects to the second 0 of its input, characterized in that, in order to improve accuracy, it contains serially connected pulse-width modulator, the first and second one-shot; the outputs of the coincidence circuit are connected to the outputs of the mono-vibrators, and the inputs of the auto-dip circuit are connected to the pulse-width modulator and to the second one-oscillator.