SU1238019A1 - Digital average meter of time intervals - Google Patents

Abstract

This invention relates to the field of radio metering technology. The purpose of the invention is to improve the measurement accuracy. The meter contains stop triggers 1 and 7, elements I and 2 and 3, counter 4, auxiliary counter 5, reference generator 6. Achieving this goal is promoted by introducing into the device blocks 8 and 13 subtraction, block 9 summation, buffer registers 10 and 11, block 12 synchronization, including the trigger 14, the counter 15 and the decoder 16, and the formation of new connections between the elements of the device, 1 ZP. F-LA, 1 Il. y from 00

Description

 The invention relates to a radio measuring technique and can, in particular, be used in systems for automatic measurement of time intervals.

The purpose of the invention is to increase the measurement accuracy.

The drawing shows a functional diagram of the meter.

The meter contains a stop trigger 1, a) trigger connected 14 trigger 14,

elements 2. and 3, counter 4 auxiliary counter 5, reference generator 6, start-trigger 7, subtraction unit 8, summation unit 9, buffer registers 10 and 11, synchronization unit 12, subtraction unit 13. The synchronization unit 12 includes a trigger 14, a counter 15 and a decoder 16.

the counter 15 and the decoder 16, the first output of which is the first output of the synchronization unit 12 and connected to the recording inputs of the First 10 and second and second 11 registers, the second

the output of the decoder 16 is the second output of the synchronization unit 12 and connected to the R input of the counter 4, a third of the output of the decoder 16 is connected to the test. It contains a serial 2 trigger input 14, the R input triggers the stop trigger 1, the first element And 2 and auxiliary counter 5, serially connected start-trigger 7, the second element And 3 and counter 4, the reference generator 6, the output of which is connected to the second inputs of the first element And 2 and the second element And 3, and the R-inputs of the triggers 1 and 7, respectively stop and start inputs from The overrun, and the overflow output of the auxiliary counter 5 is connected to the S inputs of the flip-flops 7 and 1, the first bpoc 8 of the subtractor, the first buffer register 10, the second block 13, the second buffer register 11, the synchronization block 12, and the start input synchronization unit 12 is connected to the overflow output of the auxiliary counter 5, the clock input of the synchronization unit 12 is connected to the output of the reference generator 6, the first output of synchronization unit 12 is connected to the write inputs of the first buffer register 10 and the second buffer register 11, and the second output of the synchronization unit 12 is connected to the R input of the counter, the N outputs of the first buffer register 10 are connected to the corresponding inputs of the summation unit 9, and the M outputs of the higher bits of the first buffer register 10 are connected to the corresponding inputs the first 8 and second 13 subtraction units, and the outputs of the counter 4 are connected to the corresponding inputs of the first subtraction unit 8,

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thirty

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14 is the trigger input of the synchronization unit 12 and is connected to the overflow output of the auxiliary counter 5, the counting input of the counter 1 is the clock input of the synchronization unit 12 and is connected to the output of the reference generator 6.

The meter works as follows.

When the start-trigger pulse 7 arrives at the R-input of the trigger 7, it is set to the impulse state with the following period T, from the reference generator 6 through the second And 3 element to the input of the counter 4. With the arrival at R-input trigger 1 of a pulse, a stop-trigger 1 is set to state H and an impulse with a Tg following period from the reference generator 6 times: the first element And 2 cut to the input of the auxiliary counter 5, the volume of which is t. When the outputs of the auxiliary counter 5 are set to state 1, from the output of the auxiliary counter 5 full, the S-inputs of the flip-flops 7 and 1 receive a pulse and the flip-flops 7 and 1 are set to the state O, closing the first 2 and second 3 elements AND Thus, at the outputs of the counter 4 forms Route d oichny code suitable emomu interval t is measured between the edges of start and stop pulses, increased by the amount and so on. In this way, the addition of pulse tracking periods of the reference generator 6 to the measured time interval allows the measurement of time

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The second inputs of the second buffer register 11 are connected to the outputs of the auxiliary counter 5, and the outputs of the second buffer register 11 are connected to the corresponding inputs of the second subtractor 13, the output of the second subtractor 13 is the output of the meter. In addition, the synchronization unit 12 contains sequentially connected trigger 14,

the counter 15 and the decoder 16, the first output of which is the first output of the synchronization unit 12 and connected to the recording inputs of the First 10 and second 11 buffer registers, the second

the output of the decoder 16 is the second output of the synchronization unit 12 and connected to the R-input of the counter 4, the third output of the decoder 16 is connected to the input of the trigger 14, the R-input of the trigger

14 is the trigger input of the synchronization unit 12 and is connected to the overflow output of the auxiliary counter 5, the counting input of the counter 15 is the clock input of the synchronization unit 12 and connected to the output of the reference generator 6.

The meter works as follows.

When the start-trigger pulse 7 arrives at the R-input of the trigger 7, the pulses with the period T follow, the reference generator 6 through the second element 3 comes to the input of the counter 4. With the arrival at R-input of trigger 1 of a pulse, a stop-trigger 1 is set to state H and pulses with a period Tg from the reference generator 6 times: the first element And 2 cut to the input of auxiliary counter 5, the volume of which is equal to m. the counter 5 is set to state 1, from the overflow output of the auxiliary counter 5 to the S-inputs of the triggers 7 and 1 a pulse arrives and the triggers 7 and 1 are set to the state O, closing the first 2 and second 3 elements I. Thus, at the outputs of the counter 4 is formed binary code corresponding measured emomu interval t between edges start and stop pulses, increased by the amount and so on. Thus, the addition of pulse durations of the reference generator 6 to the measured time interval allows one to measure

an interval smaller than the resolution of epemen I. The averaging of the measured time interval is carried out according to the following algorithm:

).

K Y. 01 and 1-1

X.-Y ..,

This equation is a digital order equation:

+ iZXjLYj Y

(-one

TO,

where Yj is the code of the measured time interval in the current repetition period at the output of the first buffer register 10; Yj, - measured time code

interval in the previous repetition period at the output of the first buffer register 10;

X is the code of the measured time interval in the current repetition period at the input of the first subtraction unit 8;

Cd is the coefficient determining

averaging time.

The code X. containing M binary bits from counter 4 is fed to the corresponding inputs of the first subtraction unit 8, the other inputs of which are supplied with the Yj code from the M outputs of the higher bits of the first buffer register 10. From the outputs of the first subtraction unit 8, the difference code (Xj - Yj,) is fed to the corresponding inputs of the summation unit 9, which performs the operation of summing codes

(X-Y,.,

) and KD ..,. Code CL).,

taken from the outputs of block 9 summation, and having N bits, is supplied: to the information inputs of the first buffer register 10, G arriving at the recording input of the first buffer register 10 of the write pulse generated by the synchronization unit 12, this code is rewritten to the outputs of the first buffer register efficiency K,

dom grid for n bits, which leads to an increase in the size of the block 9 summation and the first buffer register 10. To obtain a true measurement result is necessary from the measured time interval, which corresponds to the code

Multiplication code Y; on ko 2 shift

YJ, subtract the time interval of the PCT by which the measurement interval was increased before the averaging. Therefore.

ten

 five

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five

0

0

five

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five

the code corresponding to the time interval tT from the auxiliary counter 5 is fed to the information inputs of the second buffer register 11, and with the arrival of a write pulse generated by the synchronization unit 12, the record input is written to the outputs of the second buffer register 11. Writing to the buffer registers 10 and 11. after the counting of the counters 5 and 4, when the outputs of the counter 4 generates an X code. From the outputs of the second buffer register 11, the code corresponding to the interval tTo goes to the subtractive inputs of the second subtraction unit 13, to the other inputs of the subtraction unit 13 with M older outputs of the first buffer the register-10 is given a Y code (. From the outputs of the subtraction unit 13, the code. of the measured time interval is removed. By the pulse generated in the synchronization unit 12, entering the zero-reset input of the counter 4, the counter 4 is set to the zero state And the meter is ready to measure the next slot in the repetition period in which the code is automatically becomes the code.

The synchronization unit 12, generating recording and zeroing pulses, operates as follows. With a posting on the R-input of the trigger 14 of the overflow pulse of the auxiliary counter 5, the trigger 14 is set to the state O and gives permission to the counter 15. The counter input of the counter 15 receives the pulses of the reference generator 6. The outputs of the counter 15 are connected to the inputs of the depfractor 16, which depending on the input code, time-shifted pulses appear alternately at the outputs, first relative to the overflow pulse of counter 5, and each next relative to the previous one, by the duration of the pulse of the reference torus 6. First m pulse recording is performed in the buffer registers 10 and 11, the second reset pulse is produced the counter 4, and the last pulse of the trigger 14 is transferred to state 1, and the counter 15 is zeroed. After which the cycle is repeated.

Claims (1)

1. A digital averaging time meter, containing a stop-rigger, whose R-input is the stop-input of the meter, and the output is connected to the first input of the first And element, the start-trigger, the R-input of which is the start-input of the meter, and the output connected to the first input of the second element I, the output of which is connected to the counter input of the counter, the output of the reference generator connected to the second inputs of the first and second elements Hj of the first element I connected to the counting input of the auxiliary counter, overflow output This is connected to the S-inputs of stop and start-flip-flops, which is due to the fact that, in order to improve the accuracy of measuring time intervals, you enter two subtractors into the meter, Dpok summation, two buffer registers and a synchronization block The start input of the synchronization unit is connected to the overflow output of the auxiliary Counter, the clock input of the synchronization unit is connected to the output of the reference generator, the forward output of the synchronization unit is connected to the recording inputs of the first and second buffer registers, and the second output is connected to the R-in one counter, with N outputs of the first buffer register connected to the first group of inputs of the summation unit. Compiled by L. Pletneva Editor M. Dylyn Tehred O. Gortvay Proofreader S. Cherni Order 3288/47 Circulation 398 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, Projecto st., 4 the second group of inputs of which is connected to the M-outputs of the first subtraction unit, and the M outputs of the higher bits of the first buffer register are connected to the first groups of inputs of the first and second subtractors, and the counter outputs are connected to the second group of inputs of the first subtraction unit, the outputs of the auxiliary counter are connected to information inputs of the second buffer register, the outputs of which are connected to the second group of inputs of the second subtraction unit, the output of which is the output of the meter, the outputs of the adder are connected to and formational inputs of the first buffer register, 2, the Meter according to claim 1, of which. 1) Since the synchronization unit: contains a trigger, a counter and a decoder, the first and second outputs of which are respectively the first and second outputs of the block, the third output of the decoder is connected to the three-input trigger, the R-input of which is the start input of the block, and the output connected to the R input of the counter, the counting input of which is the clock input of the block, and the outputs of the bits are connected to the corresponding inputs of the decoder.