SU1215035A1 - Apparatus for isolating signal extremum moments - Google Patents

Abstract

The invention can be used to form a strobe pulse when measuring extreme values of signals. The device contains differentiating element 1, threshold element 2, element 3 AND-NOT, element 4 delay and triggers 5 and 6. Introduction to the device triggers, threshold element 7 and element AND-NOT allowed him to function reliably with input signals having areas with zero level, as well as the input and output of the input signal, which increased the accuracy of determining the moment of extremes. 2 Il. W ate about burned

Description

one

The invention relates to a pulse technique and can be used to form a strobe pulse when measuring extreme values of signals.

A device is known that contains a threshold element, a delay element whose input is connected to the first input of the threshold element, and an output to its second input, as well as a Schmidt trigger, an input connected to the output of the threshold element ij.

It is also known a device containing a differentiating element, an input connected to an input signal bus, and an output to an input of a first threshold element, a first delay element, an input connected to an output of a threshold element, and an output to the first input of an OR element, the second input of which through the second; The delay element and the inverter are connected to the output of the threshold element, 2.

The disadvantage of the known devices is due to the low reliability of the extremum signal selection, since the extremum signals are generated when the signal is applied and cleared and the signal growth rate decreases.

The purpose of the invention is to increase the reliability of determining the moments of the extremum of a signal.

The goal is achieved by the fact that a device containing a differentiating element connected to the input signal bus and an output to the input of the first threshold element, a delay element, has entered the first and second triggers, the second threshold element and the NAND element, and the output of the AND element - NOT connected via the delay element with the first inputs of the flip-flops, the outputs of which are connected to the inputs of the NAND element, the second input of the first trigger is connected to the first threshold element, the second input of the second trigger is connected through the second pore The final element with the inverse output of the differentiating element.

FIG. 1 is a diagram of the device for extracting extremum moments. The signal a j in FIG. 2 is a timing diagram of its operation.

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The device contains a differentiating element 1, the output connected to the input of the threshold element 2, the output of the element 3 AND-NOT connected through the element 4 of the delay with the first inputs of the trigger 5 and 6, the outputs of which are connected to the inputs of the element 3 AND-NOT, the second input of the three 5 connected to the output of 10 horny element 2, and the second input of the trigger 6 through the threshold element 7 with the inverse output of the differentiating element 1.

The device works as follows.

tS way.

The input signal arriving at the differentiating element 1 (fig. 2a) differentiates the second harmonic with 20 s. In the case of the direct polarity of the half-wave of the derivative (Fig. 2b), the value O receives the signal at the output of the trigger 5; when the inverse polarity of the derivative is O

25 signal at the output of the threshold element. 7 (figg). Accordingly, the trigger 5 is first switched and its source signal (FIG. 2e) becomes 1. With a subsequent change in the sign of the derivative, the trigger 6 switches and generates a single level signal at its output (FIG. 2e). According to the presence of 1 at the outputs of the flip-flops 5 and 6, the element 3 AND-NOT generates a zero signal (Fig. 2g). at least one of them (which does not have a control signal at the input for installation) to the initial state. With the return of the trigger, the output state of the element 3 IS-NOT again changes to t, and after time t the signal 1 is restored of delay element 4. The next trigger switching occurs at the next change enii derivative monitored signal mark: operation process

50 of the device is repeated. Thus, at the output of the device, pulses are formed, the front of which coincides with the moment of extremum of the signal, and the duration is determined by

55 adjustable delay t, element 4 delay. At the output of the delay element 4, pulses are formed, the front of which is displaced relative to the MoMs30

40

312

that extremum by the same value t,,

and the duration is tj

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The device functions reliably with input signals having areas of zero level, as well as with the input and output of the input signal, which increases the reliability of the determination of the moment of extremum.

Claims (1)

Invention Formula A device for the detection of extremum moments of a signal. A separate differentiating element, the input connected to the input signal, and the output to the input of the first 035 the threshold element, the delay element, characterized in that, in order to increase the reliability of determining the moments of the signal extremum, the first and second triggers, the second threshold element, the AND-NOT element are entered into it, and the output of the AND-NOT element is connected through the delay element with the first inputs of the triggers, the outputs of which are connected to the inputs of the NAND element, the second input of the first trigger is connected to the output of the first threshold element, the second input of the second trigger is connected through the second threshold element with inverse output of the differentiating element. but Editor A. Ogar Compiled by N.Konovalov Tehred T. Tulik Corrector I. Erdeyi Order 903/53 Circulation 730 VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Branch PPP Patent, Uzhgorod, st. Project, 4 Rive. 2 Subscription