SU1716520A1 - Arrangement to control succession of pulses - Google Patents

Abstract

The invention relates to a pulse technique and is intended to control and restore when a pulse sequence fails. The purpose of the invention is to expand the functionality of the device. The goal is achieved by introducing a third pulse generator 4, the third element OR 9, the first and second elements 10, 11 into the device. The invention consists in blocking the reception of signals from the device inputs for the duration of the pause between the pulses of the monitored sequence. 2 Il.

Description

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The invention relates to automation and digital technology and is intended to monitor and restore when a pulse sequence of clocking and synchronization systems fails.

The aim of the invention is to expand the functional capabilities of the device by filtering spurious pulses that occur in the pauses between the pulses of a controlled sequence. .

FIG. 1 shows a functional diagram of an apparatus for controlling a pulse sequence; in fig. 2 - time diagram of the device.,

A device for controlling a sequence of pulses (FIG. 1) comprises an input 1 of a controlled sequence; the first, second and third shaper of 2, 3 and 4 pulses, one-shot 5, delayed element b, first 7, second 8 and third 9 OR elements. the first 10 and second 11 elements And, the counter 12, the output 13 of the recovered sequence, the output 14 of the number of failures and the output of 15 failures.

The pulse shaper 3 generates short pulses when the rising edges of the pulses of the controlled sequence appear.

Shaper 4 pulses generates pulses on the falling edge of the signal from the output of the element OR. The duration g of the generated pulse must satisfy the condition

(GZ + G5 + TY),

where T is the duration of the pause between pulses

Tu-signal delay on the imaging unit 3,

T5 is the switching time of the one-shot 5 according to the signal from the output of the shaping device 3;

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TJ- signal delay on the element OR 7.

The single-vibration 5 generates pulses with a duration equal to the duration of the pulses of the controlled sequence.

The delay element b serves to provide a delay of the pulse from the output of the single-vibrator 5 for one period of the Hzad pulse sequence (r, where r is the duration of the monitored pulses).

The element OR 7 forms the recovered sequence of pulses.

The element OR 8 generates a signal when a fault occurs in a controlled sequence.

The element OR 9 generates a signal at the counting input of the counter 12.

Element And 10 generates a signal of failure in the case of degeneration of the controlled pulses into the potential of a logical unit and in the event of the appearance of spurious pulses arising in the pauses between the pulses of the controlled sequence.

Element And 11 generates a signal of failure in the case of degeneration of the monitored pulses into the potential of a logical zero or logical unit, as well as when the next pulse of the monitored sequence is shortened.

When forming a controlled sequence of pulses, the following situations are possible:

a) controlled pulses are formed without distortion (Fig. 2p);

b) there is no pause between two successive pulses (Fig. 26);

c) there is no regular impulse of the controlled sequence (Fig. 2c);

d) during a pause, false pulses are formed (fig. 2t);

e) the next impulse of the controlled sequence is a distorted shortened one (Fig. 2e).

When processing these situations, the device operates respectively in modes 1-5.

A device for controlling a pulse train operates as follows. (The power supply circuits and the installation of the counter 12 to the initial state are not shown in Fig. 1).

Mode 1 (Fig. 2, a). The controlled pulse sequence is fed through the input 1 to the first input of the element And 10 and to the inputs of the formers 2 and 3 pulses.

The leading edge of the next pulse starts the driver 2 and, in turn, starts the one-shot 5.

A single vibrator 5 generates a pulse of duration g and outputs it to the elements 6.7, 11. From the output of the element OR 7, the pulse arrives at the output 13 of the device and at the element

5 and 11. On the falling edge of the monitored pulse, the shaper 3 starts up and turns off the one-shot 5. At the same time, the signal at the output of the one-shot 5 disappears.

The pulse at the output of the element AND L 7 disappears and the driver 4 also starts. The signal from the output of the driver 4 closes the drivers 2, 3 and enters the element 10.

Upon receipt of subsequent pulses of the controlled sequence without distortion, the device operates in a similar way. In this mode, the signals at the outputs of the elements And 10, 11 do not appear and the state of the counter 12 does not change,

0 Mode 2 (Fig. 2, b).

In the case of the disappearance of a pause between two successive pulses, the one-shot 5 is triggered by the leading edge of the monitored pulse and generates at the output

5 a pulse with duration C and through the element OR 7 outputs it to output 13. On the falling edge of this pulse, shaper 4 is triggered. The signal from shaper 4 closes the shaper 2,3 and opens

0 element AND 10. A false signal from input 1 of the device enters through element AND 10. element OR 9 to the counting input of counter 12 and changes its state along the leading edge,

5 In this case, the output code 14 receives the code of the number of failures, and through the OR element 8, the output 15 receives a signal notifying of the occurrence of a failure in a controlled sequence of pulses. Next, it has a pulse generated at the output of the one-shot 5 and delayed by the element

6 delay, through the element OR 7 enters the output 13 and the elements 11, 4. At the same time, at the output of the element 11, a signal appears

5 which by the leading edge increases the content of the counter 12 by one. On the falling edge of the signal from the output element

7, driver 4 is started and the device enters mode 1.

0. Mode 3 (Fig. 2, c). In the case of the disappearance of the next pulse at the input 1, the driver 2 and the one-shot 5 do not start. At the same time, the previous pulse of the controlled sequence from the output of the delay element 6 through the OR element 7 enters the output 13 of the device and through the element 11 and the element OR 9 to the counting input of the counter 12. At the same time, the contents of the counter 12 are increased by one. Dg. - the device enters mode 1.

Mode 4. (Fig. 2, d). When a spurious pulse appears at input 1 (in the pause between adjacent pulses of the controlled sequence), the formers 2, 3 are not triggered, since they are closed by signals from the output of the shaper 4. The false pulse passes through the AND 10 element and the OR 9 element at the counting input counter 12. On the leading edge of this signal, the contents of counter 12 are incremented by one. Next, the device enters mode 1.

Mode 5 (see Fig. 2d). When a shortened pulse arrives at input 1 (the front and / or rear edges of the pulse are distorted), a shaper 2 is triggered on its leading edge, which opens the one-shot 5. Instead of a distorted pulse, output 11, element 11 and shaper 4 are received from delay element b previous pulse. On the back front of the pulse from input 1, the shaper 3 starts. On a signal from the shaper output, the one-shot 5 turns off and stops the pulse shaper. If the leading and / or the falling edge of the monitored pulse is distorted, then the And 11 element generates signals from the leading and / or falling edge of the pulse at the output of the one-vibrator 5. These signals arrive at the counting input of the counter 12 and increase its contents.

The positive effect with the use of the invention is that, with enhanced functionality, the device can detect a large class of distortion and restore the pulses of a controlled sequence. Consequently, the quality of the recovered pulses of the monitored sequence is improved.

Formula and z obrete n and

A device for controlling a pulse train comprising the first

and the second pulse shaper, single-vibrator, delay element, the first and second OR elements, the counter, the input of the controlled sequence connected to the inputs of the first and second pulse shapers, the output of the first pulse shaper connected to the start input of the single vibrator, the output of the second pulse shaper connected to the input reset one-shot, one-shot output is connected to the first output of the first OR element and to the input of the delay element, the output of which is connected to the second input of the first OR element, which output is the output of the recoverable pulse train of the device, the bit outputs of the counter are connected to the inputs of the second OR element and are the outputs of the number of device failures, the output of the second OR element is the output of the device failure sign, with In order to expand the functionality of the device by filtering false pulses of the monitored sequence, it additionally contains the third pulse generator, the third element OR, the first and second elements And, the input of the controlled sequence is connected to the first input of the first element AND, the output of the first element OR is connected to the first input of the second element AND and to the input of the third pulse generator, the output of which is connected to the inhibitory inputs of the first and second pulse shapers and whose output is connected to the first input of the third element OR, the output of the one-shot is connected to the inverse input of the second element AND, the output of which is connected to the second input of the third element OR, the output of which is connected to the counting input of the counter.

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Claims (1)

SUMMARY OF THE INVENTION A device for monitoring a pulse train comprising a first and second pulse shaper, a single vibrator, a delay element, a first and second OR element, a counter, the input of a controlled sequence being connected to the inputs of the first and second pulse shapers, the output of the first pulse shaper connected to the start input of a single vibrator , the output of the second pulse shaper is connected to the reset input of the single-shot, the output of the single-shot is connected to the first output of the first OR element, and the input of the delay element, the output of which is connected to the second input of the first OR element, the output of which is the output of the restored pulse train of the device, the bit outputs of the counter are connected to the inputs of the second OR element and are the outputs of the number of device failures, the output of the second OR element is the output of the device failure indicator, I distinguish - t e with the fact that, in order to expand the functionality of the device by filtering false pulses of a controlled sequence, it will complement It contains the third pulse generator, the third OR element, the first and second AND elements, the input of the controlled sequence being connected to the first input of the first AND element, the output of the first OR element connected to the first input of the second AND element and with the input of the third pulse generator, the output of which is connected to the inhibitory inputs of the first and second pulse shapers and with the second input of the first AND element, the output of which is connected to the first input of the third OR element, the output of the one-shot is connected to the inverse input m of the second AND element, the output of which is connected to the second input of the third OR element, whose output is connected to the counter input of the counter.