SU785979A1 - Pulse selector by repetition period - Google Patents

Description

one

The invention relates to a pulse technique, can be used in radio devices for separating a series of pulses.

According to the main author. St. No. 674209 5 a pulse selector is known by the following period, containing the element I, the first stroke of which is connected to the input bus through the one-shot and directly to the register input and the first trigger input, and the second input to the register output and the second trigger input, which output through the clock pulse generator is connected to the information input of the 15th register l.

A disadvantage of the known device is the low selection accuracy due to the lack of synchronization between clock pulses. and the front 20 fronts of selectable pulses, which leads to the formation of time-unstable selection limits relative to the leading fronts of selectable pulses. 25

The purpose of the invention is to improve the accuracy of selection.

This is achieved by the fact that in the pulse selector by following the period containing the element I, the first input 30

which is connected via an one-shot to the input bus and directly to the register input and the first trigger input, and the second input is connected to the register output and the second trigger input, the output of which. through the clock pulse generator is connected to the information input of the register, the inverter is connected in series and an additional one-shot, the output of which is connected to the additional blocking input of the clock-pulse generator, and the input of the inverter is connected to the output of the one-shot.

FIG. 1 shows a structured electrical circuit of the device; FIG. 2 - diagrams illustrating his work.

Pulse selector by period contains serially connected clock generator 1 (GTI), register 2, trigger 3 / control output of which is connected to blocking input of GTI 1, one-shot 4 whose input is connected to the input bus, element I 5, output of the one-shot 4 via an inverter € is connected to the input of the one-shot 7, the additional output of which is connected

 , "- -n

.

with the additional interlocking input of the GTI 1, the first input of the And 5 element is connected to the output of the register 2, the second input to the setup inputs of the register 2 and the trigger 3, and to the output of the one-vibrator 4, and the output to the output of the device.

FIG. 2 shows the following diagrams: 1: input pulses 8, pulses 9 at the output of a single vibrator 4, pulses 10 at the output of a single vibrator 7, pulses 11 at the output of a GTI 1, pulses 12 at the output of a register 2, signal 13 at the output of a trigger 3, signal 14 at the output pulse selector by period.

The pulse selector for the follow-up period works as follows.

The input pulse 8 triggers a single vibrator 4, which forms short pulses 9, the falling edge of which sets the initial state of register 2 and trigger 3, and produces single vibrator 7. Single vibrator 7 generates negative pulses 10 that block the operation of the GTI 1. The duration of these pulses is selected such that it is possible to produce a breakdown of GTI 1 oscillations (in practice, it is approximately equal to one period of pulses 11). Therefore, at the moment of the end of the negative pulse, 10 GTI 1 starts to give out pulses 11 with a fixed initial phase. Register 2 counts the pulses 11, arriving

duod

 d.

785979

- from the output of the GTI 1. The frequency of the pulses 11, taking into account the pulse duration 10, is chosen such that after an interval of time equal to the follow-up period of the input pulses 8, the output 3 of the register 2 has a pulse 12 when the pulses 12 coincide with the pulses 9 at the output of the element I 5, a signal 14 is generated.

Thus, the introduction of an inverter and a second one-shot makes it possible to obtain time-stable selection limits with respect to the leading edge of the selected pulses and to significantly improve the selection accuracy.

Claims (1)

1. USSR author's certificate P 674209, cl. H 03 K 5 / 19.22.06.78.