SU1167575A1 - Device for measuring repeating time intervals - Google Patents

Abstract

MEASUREMENT DEVICE OF REPEATED TIME INTERVALS, containing the first and second drivers, the inputs of which are connected to the start and stop tires, the outputs of the drivers, respectively, are connected to the first and second inputs of the time selector, the third input is connected to the output of the counting pulse generator, the first counter The outputs of the bits of which are the output of the device, characterized in that, in order to increase the reliability of the measurement, a second, third, fourth and fifth counter are entered into it and, the seven elements AND and the element SHS-NES, and the input of the second counter is connected to the 9 output of the second shaper. and the first, second, third and fourth outputs of the second counter are connected to the first inputs of the first, second, third and 1-h of the AND elements, respectively, the second inputs of the first, second and third And elements are combined and connected to the output of the temporary selector, and the second input of the fourth And element - with the OUTPUT of the generator of the counting pulses, the outputs of the first, second and third elements AND are connected to the summations of the inputs of the third, fourth and fifth counters, respectively, the subtractive inputs of which are combined and connected to the input l of the first counter and the output of the fourth element AND, the third input of which is connected to the output of the element OR NOT, the first, second and third inputs of which are connected to the outputs respectively of the fifth, sixth and seventh elements AND, the first inputs of the fifth and seventh elements And are combined 9 and connected to exit zero third h | counter, the second entrances of the sixth and ate the seventh elements And combined ate. and connected to the output of the zero fifth counter, the second input of the fifth element And and the first input of the sixth element And are combined and connected to the output Hyjfk of the fourth counter.

Description

one

The invention relates to a pulse technique and can be used to measure repetitive judgments of time intervals and to build phase meters, frequency meters, etc.

Devices are known that implement the sequential counting method, consisting in representing the measured time interval as a sequence of a certain number of pulses, following each other at reference intervals of time lj.

However, this device is characterized by insufficient measurement accuracy.

The closest to the invention in technical terms is a device for measuring time intervals containing the first and second drivers, the inputs of which are connected to the start and stop pulses, respectively, the time selector, the first and second inputs of which are connected to the outputs of the first Vi, respectively, of the second drivers, the third input of the temporary selector is connected to the output of the generator of counting pulses, and the output of the temporary selector is connected to the input of the counter Sh.

A disadvantage of the known device is the low probability of determining the true value of the time interval.

The determination of the true value of the time interval with a probability P, 0.9, is considered satisfactory, and the increase in the probability P; the desired goal when designing a time interval meter.

The aim of the invention is to increase the accuracy of time measurement.

 The goal is achieved by the fact that the device for measuring repetitive time intervals containing the first and second drivers, the inputs of which are connected respectively to the start and stop pulse buses, the outputs of the drivers are connected respectively to the first and second inputs of the time selector, the third input connected to the code of the counting pulse generator, the first

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the counter whose bit outputs are the output of the device, the second, third, fourth and five counters are entered, seven elements AND 5 and the element OR NOT, the input of the second counter connected to the output of the second driver, and the first, second, third and the fourth outputs of the second counter are connected to the first inputs of the first, second, third, and fourth elements of AND, the second inputs of the first, second, and third elements of AND, respectively, are combined and connected to the output.

tS temporal selector, and the second

the input of the fourth element I is with the output of the generator of counting pulses, the outputs of the first, second and third elements AND are connected to the summing 20 inputs of the third, fourth and fifth counters, respectively, the subtracting inputs of which are combined and connected to the input of the first counter and the output of the fourth element I, the third the input of which is connected to the output of the element I. TSh-NN, the first, second and third inputs of which are connected to the outputs of the fifth, sixth and seventh elements, respectively; And the first inputs of the fifth and seventh elements of And combined They are connected to the zero output of the third counter, the second inputs of the sixth and seventh And elements are combined and connected to the code of the zero fifth counter, the second input of the fifth And element, and the first input of the sixth And element are connected and connected to the zero output of the fourth counter.

40 The drawing shows a functional diagram of the device.

The device contains drivers 1 and 2, a time selector 3, a generator of counting pulses,

45 the first 5 and second 6 counters, the third 7, the fourth 8 and the fifth 9 counters, the first 10, the second 11, the third 12; quarter 13, fifth 14, sixth 15 and seventh 16 elements AND

50 and the element OR-NOT 17, the outputs of the bits of the counter 5 are the output of the device, the inputs of drivers 1 and 2 are connected to the buses, respectively, start and stop pulses, the outputs of drivers 1 and 2 are connected to the first and second inputs of the time selector respectively 3, whose third entrance

3

connected to the output of the generator 4 counting pulses and the second input element And 13, the input of the counter 6 is connected to the output of the imaging unit 2, the first, second, third and fourth outputs of the counter 6 are connected to the first inputs, respectively, element. Comrade And 10-13, the second inputs of the elements And 10-12 are combined and connected to the output of the temporary selector 3, the outputs of the elements 10-12 are connected to the summing inputs of counters 7-9, the subtracting inputs of which are combined and connected to the input of the counter 5 and the output of the element And 13, the third input of which is connected to the output of the element OR-NOT 17, the inputs of which are connected to the outputs of the elements 14-16, the first inputs of the elements 14 and 16 are combined and connected to the output of the counter 7, the second inputs of the elements 15 and 16 combined and connected to the zero output of counter 9, input of the AND element 14 and a first input of AND gate 15 are combined and connected to the output of the counter 8 zero.

The device works as follows.

- At the arrival of the start-pulse, the shaper 1 generates a pulse opening the time selector 3, and the counting pulses from the generator 4 through the time, the selector 3 and open with a high potential from the first output of the counter 6, the element 10 is fed to the summing input of the counter 7,

The stop pulse, which then arrives, generates at the output of the imager 2 a signal that closes the time selector and sets the counter 6 to a position in which now at its second output there is a high potential, the opening element 11, and the element 10 is closed. In counter 7, there is a recorded code corresponding to the first measured time interval between the first start and stop pulses with a certain probability P ,,

Upon the arrival of the second start-pulse, the cycle repeats only now the counting pulses pass through the open element 11 to the counter 8, where by the arrival of the second stop-pulse the code of the time interval is recorded with a probability of 2

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The code of the time interval between the third start and stop pulses is t be the knot, pj. recorded in counter 9, and the third stop impulse, 5 counted by counter 6, opens element 13. Counting pulses through element 13 begin to flow to the subtractive inputs of counters 7-9 and to counter inputs of counter 5. The contents of counters 7-9 decrease and synchronously increase the contents of the counter 5.

When the contents of any two of the three counters 7-9 reach zero, t5 at the outputs of the zero of these two counters a high potential occurs, the corresponding one of the three elements AND 14-16 is triggered, the low potential from the element OR-NOT 17 overlaps the 20 element AND 13 and the score discontinued in counter 5, a time-measured code interval is formed corresponding to its true value. with probability P,

25 The likelihood of such an event is defined as follows.

Let us put P, P. p, Otsrod, the probability that in one of the record counters the result of 3Q is more or less true, pa-.

 Then:

event probability that c. all three counters 7-9 are recorded count-. honestly impulses relevant. the true value of the measured interg vals is equal to. .

 p r-p. h rj k, - g J

the probability of an event that, for example, in two of the three counters 7-9 is recorded the number of pulses corresponding to the true value of the duration of the measured intervals, and in one of the counters 7-9 the number of pulses corresponding to the duration of the false time interval is equal to

p - p ();

the probability of an event that in one. counter 7 records information about the true time interval, c. another counter 8 — information on a false time interval greater than is. the muddy, and in the third counter 9 - information about the false time interval number 1, less than the true one, is equal to

-.p (i-f.

Full event probability

2

Р „.Р% 6Р% 6Р РП6 -ЬР.6Р ().

For example, if the probability of a single measurement is P 0.9, the measurement probability of the proposed device is P 0.9855.

Thus, the proposed device in comparison with the known 5 allows to increase the probability

determining a repetitive time interval with acceptable accuracy.

Claims (1)

DEVICE FOR MEASURING REPEATED TIME INTERVALS, containing the first and second drivers, the inputs of which are connected respectively to the start and stop pulse buses, the outputs of the drivers are connected respectively to the first and second inputs of the temporary selector, the third input of which is connected to the output of the counter pulse generator, the first counter , the outputs of the discharges of which are the output of the device, characterized in that, in order to increase the reliability of the measurement, the second, third, fourth and fifth counters are introduced into it, seven AND elements and an OR-HE element, the input of the second counter being connected to the * output of the second driver, and the first, second, third and fourth outputs of the second counter connected to the first inputs of the first, second, third and fourth elements of And, the second inputs of the first, the second and third elements And combined and connected to the output of the temporary selector, and the second input of the fourth element And - with the output of the generator of the counting pulses, the outputs of the first, second and third elements And are connected to the summing inputs, respectively, a third of the fourth, fifth and fifth counters, the subtracting inputs of which are combined and connected to the input of the first counter and the output of the fourth AND element, the third input which is connected to the output of the OR-NOT element, the first, second and third inputs of which are connected to the outputs of the fifth, sixth and seventh elements And, the first inputs of the fifth and seventh elements And are combined and connected to the zero output of the third counter, the second inputs of the sixth and seventh elements And are combined and connected to the zero output of the fifth counter, the second input of the fifth element And and the first input of the sixth element AND combined and connected to you. go zero of the fourth counter.