SU1363256A1 - Device for digital determination of signal mean values - Google Patents

Abstract

The invention relates to digital measurement technology and can be used to measure current average values of signals. The purpose of the invention is to achieve accuracy. The device contains a voltage converter 1 — a code, a pulse generator 7., an element. And 4, a trigger 4, a minimum value determination unit 5, a maximum value determination unit 6, counters 7.8 and 9 pulses, delay elements 10 and 11, converters 12 and 13 code - the number of pulses, a block of 14 elements And, dividers 15 and 1b frequency and block 17 registration. The operation of the device is based on a separate calculation of the average values of the values included in the expression for the current average, which makes it possible to increase the smoothing accuracy with small dispersion of the input signals. 1 il. & with 55 WITH tsD SL O5

Description

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The invention relates to a digital measurement technique and can be used to measure and promptly monitor current average values of signals.

The aim of the invention is to increase the accuracy of averaging.

The drawing shows a block diagram of the device.

The device contains a voltage converter 1 - a code, a generator of 2 pulses, an OF element, a trigger 4, a minimum value determination unit 5, a maximum value determination unit 6, pulse counters 7-9, delay elements 10 and 11, converters 12 and 13 code - number pulses, block 14 elements And, dividers 15 and 16 frequencies, block 17 registration, input 18 of the device.

The device works as follows.

The smoothing interval is divided into q polling intervals about

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1 C GL

-, and the current average is determined by the modified algorithm

 {t) 5c (t) 1 (t 1

Xc 4lVb; j --J

This algorithm allows even for a small difference x (t + qTp) -x "(t) to maintain sensitivity to changes in the input signal even for small dispersions of the input signals, since the numbers of pulses proportional to each of the components x (t + qTo) and x (t).

The duration of the Tcd interval is determined by the technical characteristics of the signal and is chosen to be, for example, the time interval between the moments of reaching the minimum and maximum of the sigv; ala. The average value of the signal in the smoothing interval is determined by the method of discrete samples, the number of which k q + 1 is variable.

When the signal x (t) reaches the minimum value, block 5 generates a smoothing start pulse, which enters the installation inputs in O counters 8 and 9 and resets them to the zero state. At the same time, a smoothing start pulse is applied to the input of the trigger 4 and sets it to the state in which the And 3 element opens. In this case, the sampling pulses from generator 2 begin at .5

2562

set up on control input P1) module, -; - caller 1, on elements 10 and 11, РШ input of installation in О of counter 7, on input of counter 8 and on. installations in About dividers 15 and 16,

Each pulse sample, hitting the inputs of the installation in O of the counter 7 and dividers 15 and 16, resets them to the Q zero state. At the same time at the moment of the pulse-sample occurrence at the control input. Transducer 1 starts up, and the voltage of the measured signal x (t) is transformed into a code that is entered into counter 7, hitting the counter input of counter 8 , the pulse pulses are counted by him, as a result of which, the counter 8 accumulates the number of pulse pulses k, resulting in the output of a code corresponding to the current smoothing interval duration and the determining division factor of the dividers 15 and 16, 5 Impulses -samples detained by ale 11 is x (t) signal conversion time in the inverter 1, converter 13 is started, the last number converts code zapisanno- 0 of the counter 9, a proportional number of pulses, which is supplied to the dividend input of divider 16,

Pulses are selected, delayed. element 10 for the total conversion time in converters 1 and 13, start converter 12, which converts the code of the number recorded in counter 7 into a proportional number of pulses, which is divided by 40 divider 15 by k times and fed to the counting input of counter 9 ,

The number of pulses arriving at the input of the dividend divider 16 from converter 13 is divided by divider 16 by; jg k times, the result of the division goes to the subtracting input of counter 9 and is subtracted from the contents of the counter. The contents of counter 9 at any time of the smoothing interval is proportional to gQ but the average value of the signal under study over the past part of this interval.

When the signal x (t) reaches the maximum value of block 6, the pulse of the smoothing end, which flips trigger 4, results in the forbidden passage of w-1 pulses through samples 3, Ds.k of averaging of signal x (t) terminates.

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(.dio) rhomo1P1 () mimi Koiiira smoothing on start-up biok 4, and the average smoothing parameter; know the signal value

.x (t) is fixed by block 17.

Claims (1)

Invention Formula Device for digital determination of average values of signals, containing voltage converter - code, two converters code - number of pulses, clock generator, element And, trigger, block for determining maximum values, block for determining minimum values, three counters of pulses, two delay elements And block, the first frequency divider, the registration block, the information input of the voltage converter — the code is connected to the inputs of the maximum and minimum values determining blocks and is a device input The output of the clock generator is connected to the first input of the element I, the second input of which is connected to the trigger output, the inputs of the installation in 1 and O of which are connected respectively to the outputs of the minimum and maximum values, the output of the element And is connected to the input of the installation in About the first counter, with the counting input of the second counter, with the start input of the voltage converter - the code, with the installation input into the first frequency divider, through the first delay element - with the start input of the first converter E. opcha Compiled by V.Orlov Tehred A. Kravchuk. Order 6365/43 Circulation 671.Subscription INSIGHTS of the USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 , water-printing enterprise, city of Uzhgorod, Proektna str., 4 6 s 0 5 o five 564 l code - number of pulses, through the second delay element - with the start input of the second converter code - number of pulses, installation input O of the second counter connected to installation input O of the third counter and connected to the output of the minimum value detection unit, output of the voltage converter - the code is connected to the counting input of the first counter, the output of which is connected to the information input of the first converter; code - the number of pulses, the output of which is connected to the information input of the first frequency divider, the input of the co the division factor and the output of which are connected respectively to the output of the second counter and the counting input of the third counter, the output of which is connected to the information input of the second converter code — the number of pulses and the first input of the AND block, the second input and output of which are connected to the output of the maximum value detection and the input of the registration unit, respectively, which differs from the fact that, in order to improve accuracy, a second frequency divider is entered into it, Setup input to O, information input, input of setting the coefficients cient and dividing the output of which is connected respectively to vghodami element and the second transducer code - the number of pulses of the second pulse counter and a subtraction input of the third pulse counter. Proofreader V. But ha