SU739726A1 - Pulse by length selector - Google Patents

Description

(54) DURATION PULSE SELECTOR

The present invention is irrigating a pulse by a technique that can be used in automagical devices for searching and selecting pulses of a given duration in a sequence of pulses with a random phase of the front. A pulse duration selector is known, which contains an internal synchronizer, an input logic circuit, two shift registers, a pulse output stage, a pulse duration gathering circuit, a decisive logic circuit, reset cascades, a gating cascade 1. A lack of a selector is a complicated circuit. A pulse selector is also known by duration, containing a waiting multivibrator, one OUTPUT of which is connected to the input of the pulse generator of the reference sequence, the output of which is connected to the first input of the logic element I, the second input of which is connected to the output of the back edge of the pulse former, the inputs of which are connected to the inputs of the standby multivibrate second the output of the back edge of the pulse is connected to the input of the strobe pulse former, the output of which is connected to the third input of the waiting m ltivibratora 2. The disadvantage of this selector is the absence of a pulse of the original duration at the output of the circuit. The goal is achieved by the fact that the pulse selector has a duration containing a waiting multivibrator, one output of which is connected to the input of the Shpu) Tshs6v etalTuyu duration, the input of which is connected to the first input of the logic element And, the second input of which is connected to the output of the rear of the front of the pulse, the inputs of which are connected to the inputs of the standby multivibrator, the second output of the back edge of the pulse generator is connected to the input of the former of the pulse & 1 pulses, the output of which is connected to tr temu entry monostable multivibrator administered OR gate, the additional AND gate and for1 shrovatel additional pulses, one of which yhod soerinen to the first input of NAND gate

OR and the input bus, the second input is connected to the output of the logical element AND, the first code of the additional gate generator is connected to the second input of the logical element OR its output is connected to the First input of the additional logical element AND, the second input of which is connected to the second output of the waiting multivibrator, and by the fact that the driver of additional strobes consists of a trigger, the inputs of which are connected to the inputs, and the output is connected via an inverter to the first input of the logic element AND ovatel additional pulses, and the first capacitor, and directly with one of the output of the additional stryubimpulsov and the second input of the AND gate shaper additional pulses, whose output is connected to the second capacitor and the other output of the other of pulses.

The structural electrical diagram of the pulse selector for duration is shown in the drawing.

The selector contains the logic element OR 1, the waiting multivibrator 2, the driver 3 of the rear edge of the pulse, the driver 4 pulses of the reference duration, the driver 5 strobes. logical element AND 6. A shaper 7 is an additional strobe pulse consisting of trigger 8, a logical element OR 9, a first capacitor 10 of an AND 11 logic element and a second capacitor 12, an additional logical element 13. Shaper 5 strobe pulses contains a photoelectric shift capacitor 14.

The pulse selector in duration works as follows.

Each of the pulses of the input sequence enters the first input of the logic element OR 1 and starts the waiting multivibrator 2, and sets the trigger 8, which by the signal from the inverse output creeps the additional logic element AND 13. The waiting multivibrator 2 generates a pulse of the reference duration, which is fed to the input of the forcing 4 pulse duration reference. From its output, a signal, (X) is output to the falling edge of the pulse of the reference duration, is applied to one of the inputs of the logical element 6.

At the same time, a signal is formed in the shaper 3 of the back edge of the pulse, which corresponds to the front edge of the input pulse. This signal is applied to the second VHBD; of an AND logic element (Simultaneous action of signals on the inputs of an AND 6 logic element gives out a selection pulse, which indicates the arrival of a pulse of a given duration. This pulse will reset trigger 8. At this, an additional logic element will open. 13. Shaper 7 additional strobe pulses signal corresponding to the reset time of the trigger 8. This signal after a delay using the second capacitor 12 for the duration of the transition process in the waiting multivibrator 2 is fed to the second input logic element OR 1, and then restarts the waiting multivibrator 2.

The reshaped impulse of the reference duration of the waiting multivibrator 2 is fed to the second input of an additional logic element 13. At the output of the latter, a pulse is obtained that corresponds in duration to the input selected impulse, but is delayed relative to it by the time ta t of this, 1 where tjf is the reference duration;

1cc is the delay time for the arrival of a retransmission gating pulse to start the LM.

If the duration of the input pulse differs from the given signal, the signal is not formed at the output of the logic element And 6, since the pulses from the drivers act on its inputs non-simultaneously. At the same time, the trigger 9 remains in the excited state and thereby closes the additional logic element AND 13, preventing the passage of the pending multivibrator 2 to the output bus.

A polled pulse is applied to the strobe pulse generator 5, which is delayed by a phase-shifting capacitor 14 for a time equal to the duration of the signal corresponding to the falling edge of the polled pulse. The strobe pulse shaper 5 outputs a signal corresponding to the back front of the delayed input pulse. This signal is formed after the end of the input pulse and is fed to the feedback circuit of the waiting multivibrator 2. If the multivibrator 2 has not yet passed into a quiescent state, the pulse forcibly resets it. This occurs when the duration of the input pulse is less than the reference.

As a result, the impulse of the reference duration V is not fully processed, and the selector is rendered ready for polling the next input pulse.

In all other cases, the waiting multivarter 2 is already at rest at that moment, and the strobe pulse does not change its state.

Claims (1)

Invention Formula 1, Pulse selector for duration, containing a waiting multivibrator, one you