SU1405106A1 - Pulse duration selector - Google Patents

Abstract

The invention can be used in automated control and monitoring systems, for example, in test equipment. The invention extends the functionality of the device, which is achieved by ensuring selection with a random number of pulses per burst.

Description

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The device contains a pulse generator 1, shapers 2 and 21 imkuls, a pulse counter 3, a comparison unit 4, register 5, delay elements 6 and 22, elements OR 7, 8, 15 and 20, a code converter 9 in a time interval, block 10 of forming the signal of the end of the burst, triggers 11 and 16, elements AND 12, 14, 17

and 19, multivibrators 13 and 18, input 23 and output 25 tires and reset bus 24. The selector provides the selection of pulses of maximum duration from a burst of pulses of a random sequence, when the number of pulses is not known in advance, and the maximum possible period of pulses in a burst is known. 1 hp f-ly, 3 ill.

one

The invention relates to a pulse technique and can be used in automated control and monitoring systems, for example, in control and measuring equipment.

The purpose of the invention is to expand the functionality by enabling selection with a random number of pulses in a burst.

FIG. Figure 1 shows the electrical structure of the device; in fig. 2 - structural electrical circuit of the code converter in the time interval; in fig. 3 - timing charts explaining the operation of the device.

The device (Fig. 1) contains a pulse generator 1, the control input of which is connected to the input of the first driver 2 pulses, and the output with the counting input of the pulse counter 3, the output of which is connected to the first information input of the comparison code unit 4 and information input register 5. The output of the imaging unit 2 is connected via the first delay element 6 to the first input of the first element OR 7, the second input of which is connected to the output of the second element

OR 8.

I

The output of register 5 is connected to the information input of the code converter 9 in the time interval. The input of the driver 2 is connected to the first input of the block 10 of forming a signal of the end of the burst and, accordingly, to the counting input of the first trigger 11 whose first output is connected through the first element sequentially; And 12, the first multivibrator 13

d

five

the second element And 14 and the third element OR 15 is connected to the installation input of the second trigger 16, the output of which is connected to the first output of the block 10.

The second trigger code 11 through the third element AND 17 serially connected, the second waiting multivibrator 18 and the fourth element AND 19 are connected to the second input of the OR element 15. The outputs of the multivibrators 13 and 18 are connected to the first and second inputs of the fourth element OR 20, respectively, which output The second pulse shaper 21 is connected to the second output of block 10. The second output of block 10 is connected via the second delay element 22 to the first input of the OR element 8. The control input of the generator 1 is connected to. input bus 23. The second input element OR 8 is connected to the reset bus 24 and to the reset input of the converter 9, the output of which is connected to the output bus 25, the first control input to the first output of the block 10, the second control input to the second output of the block 10 .

The output of the imaging unit 2 is connected to the control input of block 4, the second information input of which is connected to the output of register 5, the reset input of which is connected to the second input of block 10, and therefore to the reset input of trigger 16 and the output of the element 8. The output of the element OR 7 connected to the reset input of counter 3. The output of block 4 is connected to the control input of register 5. The second inputs of elements 12 and 17 are connected to the counting input of trigger 11, and the outputs to the second inputs of elements respectively 19 and 14, the outputs of which are connected with multi reset inputs vibrators 18 and 13 respectively.

Converter 9 code to the time interval contains the element IL1 26, the trigger 27, the pulse counter 28, the pulse generator 29 and the delay element 30, and the reset input of the converter 9 is connected to the first input

the element OR 26, the second input of which io is carried out by a pulse c through element 30 is connected to the upsurge of the counter 28, and the output to the reset inputs of the counter 28 and the trigger 27, the information input of which is connected to

register 5 from the output of the counting code enters a code that is in register 5 by a block or codes that is signaled at the output. Thus, line 5 is recorded on the basis of an eye pulse in a packet of pulse input. Reset Counter 3

shaper 2 pulses, 6th delay element, ment OR 7. Upon completion of the pulse in the register 5, writing

the first control input transform ig proportional to the duration of the

25

the driver 9, the control input with the second control input of the converter 9 and the control input of the counter 28, and the output with the output of the converter 9 and with the control input of the generator 29, the output 2 of which is connected to the counting input of the generator 29, the output which is connected to the counting input of the counter 28, the information input of which is connected to the information input of the converter 9.

The pulse selector in duration works as follows.

The reset pulse from the bus 24 of the initial reset through the elements OR 8, 7 and 26 is fed to the reset inputs of the counters 3 and 28 pulses, flip-flops 16 and 27 and register 5. At the outputs of the counters 3 and 28 pulses, flip-flops 16, and 27 and register 5 are set logical levels

With the beginning of the pulse train, the duration of the first pulse with the help of the pulse generator 1 in the pulse counter 3 is converted into a code, which 40 is compared in the code comparison block 4 with the code at the output of the register 5. The code comparison block 4 is made on the basis of the code comparison elements, the outputs

thirty

35

impulse, i.e. Register 5 always stores a code proportional to the maximum pulse width. The delay time of the delay element 6 is chosen to be longer than the pulse shaping time at the output of the code comparison unit 4 and the recording of information in the register 5,

The input pulses (Fig. 3A) from the input bus 23 arrive at the counting clock of the trigger 11. The latter, with the arrival of each input pulse, changes its state to the opposite and delivers the enabling signal to the first inputs of the And 12 and 17 elements (Fig. 35, &;) the second inputs of which receive input pulses. Suppose that the first pulse of the input pulse train is wilted at the output of the element And 12, then a random pulse arriving at the input bus 23 of the pulse selector passes to the output of the element 17 and switches the trigger 11 to pass the next pulse to the output of the element 12. The circuits of multivibrators 13 and 18 and the time constants of their time of the driving circuits are the same and are chosen so that the duration of the quasi-empty

which are connected to the inputs of the multiple state byp is greater than the maximum element (not shown). The number of elements of the comparison is determined by the size of the information outputs of the counter 3 and register 5 and the bit of the potential difference between the pulses, which can still be referred to as a burst. The impulse from the output of the element And 12 starts the awaited multi-

by the element of comparison. The moment c-gQ tivibrator 13 (Fig. 3g) is served

This is set by the pulse former 2, which generates a pulse by a negative voltage drop of the input pulse. In the initial state at the output of register 5, the code is zero, therefore block 4 of the code comparison gives a signal that the code of the counter of 3 pulses is greater than the code of register 5. By this input signal

55

To the input of the element is And 19 and, since there is no decisive signal from the output of the railway multivibrator 18 (Fig. 3), this pulse does not pass to the output of the element 19 And. If the second impulse of the packet comes during the quasistable state of the standby multivibrator 13, then the impulse from the output of the element I 17, start up the waiting multivibrator 18, n

i is carried out by impulse c 51064

register 5, from the output of the counter 3 pulses, a code is received, which is recorded in register 5 according to a signal generated at the output of block 4 of the code comparison. Thus, the code in register 5 is recorded at the end of the first pulse in a burst of input pulses. 3 pulse counter reset

output

driver 2 pulses, delayed delay element 6, through element OR 7. At the end of the second pulse, a code is written into register 5.

five

0

0

five

impulse, i.e. Register 5 always stores a code proportional to the maximum pulse width. The delay time of the delay element 6 is chosen to be longer than the pulse shaping time at the output of the code comparison unit 4 and the recording of information in the register 5,

The input pulses (Fig. 3A) from the input bus 23 arrive at the counting clock of the trigger 11. The latter, with the arrival of each input pulse, changes its state to the opposite and delivers the enabling signal to the first inputs of the And 12 and 17 elements (Fig. 35, &;) the second inputs of which receive input pulses. Suppose that the first impulse of the input bursts of wils at the output of the element And 12, then a random impulse arriving at the input bus 23 of the pulse selector passes to the output of the element And 17 and switches the trigger 11 to pass the next impulse to the output of the element And 12. The schemes of multivibrators 13 and 18 and the time constants of their time of the driving circuits are the same and are chosen so that the duration of the quasistable state is longer than the maximum

the smallest possible period between pulses, which can still be attributed to a packet of pulses. The impulse from the output of the element And 12 starts the awaited multi-

five

the input element And 19 and, since the permissive signal from the output of the railway multivibrator 18 is not (fig. 3), this pulse does not pass to the output of element 19 And. If the second impulse of the packet comes during the quasistable state of the waiting multivibrator 13, then the impulse from the output of the element And 17, the start of the waiting multivibrator 18, is passed through the open permitting signal from the output of the waiting multivibrator 13 and 14 to the drop input OR 15 sets a high level on the first sprint at the first stage of the trigger 16

I A high voltage level from the output of the trigger 16 is fed to the first control input of the converter 9 of the code in the time interval and, accordingly, the information input of the trigger 27. Under the action of the input pulses following in the bundle, a high voltage level is constantly waiting multivibrators 13 or 18. These signals are fed to the inputs of the element OR 20 and at its output is a high level during the action of the input pulses in the packet plus the time of the quasistable state of one of the waiting multivibrators (figo Ze) the input of which the last pulse in the bundle is received. The pulse shaper 21 generates a pulse Kfg, 3A) under the action of a negative voltage drop across its input. From the output of the shaper 21, the pulse goes to the second control input of the code converter 9 in the time interval and, accordingly, the trigger trigger inputs 27 and a counter of 28 im- | pulses.

On the positive side, the voltage drop at the second control input of the Converter 9 records the code from the outputs of register 5 into the counter of pulses 28, and a high voltage level is formed at the output of trigger 14. From the output of the latter, a high voltage level is supplied to the control input of the pulse generator 28 and simultaneously to the output slit 25 of the pulse selector, forming the leading edge of the output pulse.

The pulses of the generator 29 arrive at the counting input of the counter 28 pulses and change its state with the arrival of each pulse per unit. With the equality of the content of the pulse counter 28 to zero, a high level of voltage is input to the input of the delay element 30. The signal from the last output goes through the second input of the element I.PI 26 to the reset inputs of the trigger 27 and the pulse counter 28, setting at their outputs low voltage level. In this case, the pulse generator 29 stops the formation of pulses and a falling front is formed on the output selector bus 25 of the im-I-pulses.

output pulse. At the same time, the output pulse of the driver 21, delayed by the delay element 22, flows through the elements OR 7 and 8 on

0 reset inputs of the counter 3 pulses, register 5, trigger 16, set at their outputs a low voltage level. The delay time of delay element 22 is longer than the recording time of information in the pulse counter 28, and the delay time of delay element 30 is longer than the reset time of trigger 27 and pulse counter 28.

With the appearance of single

0 pulses triggering triggers multivibrators 13 or 18 (fig. 3;, /)), but since there is no next pulse-at the selector input, there is no pulse at the outputs of the elements 14 or 19,

5, a pulse is not formed at the output of the fourth element OR 15 and at the first input of the trigger 16. Therefore, there is a low voltage level at the information output of the trigger 16. At the same time, the pulse from the outputs of the waiting multivibrators 13 or 18 is fed to the input of the third element OR 20. From the output of the latter, the pulse arrives at the input of the driver of 21 pulses. At the output of the latter, by a negative voltage drop at its input, a pulse is generated, which is fed to the input of the delay element 22 and the control inputs of the trigger 27 and the pulse counter 28. Since at the information input of the trigger 27 a low voltage level, a high level at its output is not generated. At the same time, from the output of register 5, the code proportional to the duration of a single pulse, according to the pulse generated at the output of the imaging unit 21, is rewritten into the pulse counter 28. But since at the output of the generator 29 pulses do not form, it does not form

0 a pulse is measured and at the output of the pulse counter 28. I

In the pulse counter 28, a code proportional to the length of a single pulse is stored until the next single-pulse or burst of pulses arrives. Thus, if a single pulse entered the selector input, then at its output a pulse

0

five

0

it is not formed, which allows for the detection of random noise in the form of single pulses.

The proposed pulse selector of p duration ensures that the pulse of maximum duration is allocated from a burst of pulses of a random sequence when the number of pulses in a burst of pulses is not known in advance and the maximum possible pulse period in the burst is known. At the same time, the output pulse duration is saved at the device output. In addition, the proposed device is protected from accidental interference in the form of single pulses. This makes it possible to use the proposed device for the selection of pulses according to the length of a bursts of pulses of random sequences.

Claims (1)

1. Pulse selector in duration, containing a series-connected pulse generator, the control input of which is connected to the input bus, a pulse counter and a code comparison unit, the second information input of which is connected to the register output, the first pulse shaper, the input of which is connected to the input the bus and the first input of the pulse termination signal shaping unit, the first output of which is connected to the first control input of the code converter in the time interval, the output of which is connected to the output bus, and a reset bus, characterized in that, in order to extend the functionality by allowing selection with a random number of pulses in a burst, the first and second OR elements, the first and second delay elements are introduced into the Negro, and the output of the first pulse shaper is connected to the input of the code comparison unit and through the first delay element to the first input of the first OR element, the output of which is connected to the reset input of the pulse counter, and the second to the reset input of the register, the output of the second el ment and a second input of OR signal generating unit completion burst, the second output of which is coupled to a second control input from 5 0 5 about 5 five 0 five 0 the code converter to the time interval and through the second delay element with the first input of the second SHSh element, BTopofi whose input is connected to the reset bus and the reset input of the code converter to the time interval, whose information input is connected to the output of the register, the control input which is connected to the output the code comparison unit, and the information input with the output of the pulse counter, wherein the block of forming the signal of the end of the burst contains the first trigger connected in series, the counting 1st input of which is connected En with the first input of the burst end forming unit, the first element is AND, the first waiting multivibrator, the second element is AND, the third element is OR, the second trigger, the output of which is connected to the first output of the block of forming the signal of the end of burst, as well as serially connected third element And, the first input of which is connected to the second output of the first trigger, the second waiting multivibrator, a quarter And element, the output of which is connected to the reset input of the second waiting multivibrator. And the second input of the third element IL, the first input of which is connected to the reset input of the first waiting multivibrator, and the second inputs of the first and third elements I are connected to the counting input of the first trigger-. pa, and the outputs with the second inputs of the fourth and second elements AND, respectively, the outputs of the first and second waiting multivibrators, respectively, with the first and second inputs of the fourth OR element, the output of which is connected to the second output of the end-of-pulse signal generator unit the input of which is connected to the reset input of the second trigger, 2, Pop selector pop.1, differing by the fact that the code converter in the time interval contains an OR element, a trigger, a pulse generator, a pulse counter, a delay element, the first input of the OR element is connected to the reset input of the code converter time interval, the second input - through the element behind 914 holders with pulse counter output, and the output with the pulse counter and trigger trigger inputs, whose information input is connected to the first control input of the code converter in a time interval, the control input - to the second control input of the code converter in a temporary interval and with control input 6 ten pulse, and the output with the output of the code converter in the time interval and with the control input of the pulse generator, the output of which is connected to the counting input of the pulse counter, whose information input is connected to the information input of the code converter in the time interval, /