SU1690181A1 - Device for separating first and last pulses in series - Google Patents

Abstract

The invention relates to a pulse technique and can be used in automation and computing devices. The purpose of the invention is to reduce the response time when pulses are extracted from a series with a varying period and duration of follow-up by introducing a single vibrator 2 and a coincidence element 5. The device also contains a one-shot 1, elements 3 and 4 coincidence, input bus 7, output buses 6 and 8. 1C.p. f-ly, 2 ill.

Description

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

The purpose of the invention is to reduce the response time when pulses are extracted from a series with a varying period and duration.

Figure 1 shows an electrical functional diagram of the device; 2 shows timing diagrams for his work.

A device for separating the first and last pulses in a series contains the first and second single vibrators 1 and 2, the first, second and third coinciding elements 3-5, the output of the first of which is connected to the first output bus 6, the input of the first single vibrator 1 is connected to the input bus 7 and the first direct input of the second coincidence element 4, the output of which is connected to the second output bus 8. The inverse input of the third coincidence element 5 is connected to the input bus 7, the direct input to the output of the first one-oscillator 1, the second direct input of the second element 4 sovp Adeni and inverse input of the first element 3 coincidence, and the output with the input of the second single vibrator 2, the output of which is connected to the inverse input of the second element 4 coincidence and with the direct input of the first element 3 coincidence.

The single-vibration 1 (2) contains an OR 9.1 (9.2) element, the first input of which is connected to the single-vibration input, the output of which is connected to the output of the OR 9.1 element (9.2) and through series-connected diode 10.1 (10.2) and a circuit of the first resistor 11.1 connected in parallel ( 11.2) and a capacitor 12.1 (12.2) with a second input of the element OR 9.1 (9.2), which is connected via a second resistor 13.1 (13.2) to a common bus.

The parameters of the one-shot 1 and 2 are chosen to

ts ti

where ts is the duration of the pulse generated by the single vibrator;

Gu is the maximum pulse duration of the series.

The device works as follows.

In the initial state, the bus 7, the outputs of the single vibrators 1 and 2, and the output buses 6 and 8 contain low level signals.

The first impulse of the series (Fig. 2a) goes via bus 7 to the inverse input of element 5, the first direct input of element 4 and to the first

the input of the element OR 9.1 of the one-shot 1, which is triggered by the leading edge of the first pulse and a high level is formed at its output (Fig. 2c), which arrives at the second direct input of the element 4, the inverse input of the element 3 and the direct input of the element 5, at the output of the element 4 a high level is formed (fig. 2g). At the output of element 5, a high level is formed.

from the trailing edge of the first pulse, arriving at the first input of the element OR 9.2, and at the output of the one-vibrator 2, a high level is formed (Fig. 2e), arriving at the direct input of the element 3 and the inverse input

element 4, the output of which forms a low level (Fig. 2g).

The one-vibration 1 works as follows.

Bus 7 high

the first pulse arrives at the first input of the element OR 9.1 (Fig. 2a), a high level is formed at its output, which through the diode 10.1 enters through a differentiating RC circuit (consisting of a capacitor

12.1 and resistor 11.1) to the second input of the OR element 9.1, the output of which will be a high level, for the time ts of charging and discharging the capacitor 12.1 (the discharge goes through resistors 11.1 and 13.1, the diode 10.1 prohibits

capacitor discharge at the output of the element OR 9.1) to the threshold of the low level of the element OR 9.1. Any subsequent pulse when the condition ts tM is satisfied, the process of charging and discharging capacitor 12.1 repeats, and the output of the one-vibrator 1 is high.

A single-vibrator 2 is similarly made and works.

At the outputs of the one-shot 1 and 2, high levels are set for the time of the pulses in the series, the last pulse of the series by the high level forms a low level at the output of the one-vibration 1 (ts), which sets to

the output of the element 3 is high (fig.2z), and on the element 5 is low (fig.2g). In the one-shot 2, the differentiating RC circuit starts to work for a discharge, and after a discharge time tp of a capacitor on

its output forms a low level (Fig. 2e), which at the output of element 3 forms a low level (Fig. 2h), and element 4 prepares to separate the first pulse of the next series.

When a pulse arrives, interference, the duration of which is shorter than the response time of the one-shot 1, does not form pulses on the output buses 8 and 6.

When a single impulse arrives on bus 7 (Fig. 2a), a first impulse is formed on the output bus 8 equal to the duration of this impulse (Fig. 2g), and the last impulse equal to the duration of the discharge time of the capacitor from the second single vibrator on bus b.

In this device, when setting the response period of a single vibrator ts, the first and last pulses are extracted even with single losses of pulses in the series, as well as with a varying period and with a varying pulse duration in the series.

The operation time of the driving RC circuits in the single-oscillators for charging and discharging the capacitors reduces their nominal values while maintaining the same duration of the single-oscillator response period.

Claims (2)

Invention Formula 1, A device for separating the first and last pulses in a series, comprising the first and second coincidence elements, the output of the first of which is connected to the first output bus, the first one-oscillator, whose input is connected to the input bus and the first direct input of the second coincidence element, the output of which is connected to the second output bus, characterized in that, in order to reduce the creep time during the separation of pulses from a series with a varying period and duration, a second one-shot and a third coincidence element are introduced into it, the inverse input of which is connected to the input bus, the direct input is connected to the output of the first one-shot, the second direct input of the second match element and the inverse input of the first match element, the output is connected to the input of the second one a bratra, the output of which is connected to the inverse input of the second coincidence element and the direct input of the first coincidence element. 2. The device according to claim 1, which differs from the fact that each of the single vibrators contains an OR element, the first input of which is connected to the input of a single vibrator, the output of which is connected to the output of the IL AND element and through serially connected 5 diode and circuit of the first resistor and capacitor connected in parallel with the second input of the OR element, which is connected to the common bus through the second resistor.