SU1645971A1 - Adaptive temporal digitizer - Google Patents

Abstract

The invention relates to automation and computing and can be used to sample continuous signals. The purpose of the invention is to improve the accuracy and simplify discretiator. The device contains a delta modulator 1, a sawtooth voltage generator 2, memory 3 and element 3, sampling-storage unit 4, scaling element 5, multiplication unit 6, sampling counter 7, comparator 8, logfmator 9 ratios with corresponding connections, 1 il.

Description

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The invention relates to automation and computing and can be used to sample continuous signals.

The purpose of the invention is to improve the accuracy and simplify the sampler.

The drawing shows a functional diagram of a sampler comprising a delta modulator 1, a sawtooth voltage generator 2, a storage element 3, a sampling-storage unit 4, a scaling element 5, a multiplication unit 6, a sample count counter 7, a comparator 8, a logarithmizer 9 ratio, input 10 and output 11 of the sampler

Adaptive time sampler works as follows.

At the initial moment of time, the generator 2 starts up, operating in the standby mode and having a period of equalizer equal to the maximum possible duration Tc of the sampled signal. On the output signal of the delta modulator 1, the storage element 3 captures the signal from the output of the generator 2, proportional to the time T that has passed since the beginning of the sampler operation. A signal proportional to T is fed to the second input of the logarithm 9 and to the input of element 5, the output of which forms a signal proportional to pT arriving at

the second input of the multiplication unit 6, the second input of which receives a signal from the output of counter 7, fixing the number n of formed samples of the sample. The first input of the logarithm 9 receives a signal from the output of generator 2, proportional to the current time t, passed from the beginning of the sampling. The output of the logarithm 9 generates a signal U-, proportional to the difference of the logarithms of the signals arriving at its first and second inputs:

.nt-ln.kT)

(one)

Where

H

log transfer ratio of 9; k is the steepness of the sawtooth voltage of generator 2. The equation (1) should be written in the form:

U, k, ln. (2)

At the output of block 6, the Ufi signal is proportional to the product of the signals at its inputs:

w

k -T- n.

(3)

where k is the transfer coefficient of block 6;

H

U- and Ug signals

element transmission coefficient 5.

arrive at the inputs of the comparator 8 and at the time when they are equal, the output of the comparator 8 appears pulses that arrive at the input of counter 7 and to the control input of block 4. Taking into account equations (2) and (3) time intervals T dependence

(1p kP k

kg-T-n,

(four)

The coefficient k, is selected from

can be written

 exp (n -).

in and

With each pulse from the output of the comparator 8, the content of the counter 7 is increased by one, and the signal level stored in block 4 is fed to the output 11 of the sampler.

As a result, block 4 performs a specified number of samples of input signal values at times tn, following the exponential law

 (P ).

Formula

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An adaptive time sampler containing a delta modulator connected by an input to the information input of the sampler, the information input of the sample-storage unit and the trigger start input of the sawtooth voltage generator, the output of which is connected to the first input of the multiplication unit through the series-connected memory element and the scaling element connected by the second input to the output of the sample counter, the counting input of which is connected to the output of the comparator and the control input of the sampling-storage unit316459716

whose output is the ratio output rifmator, the first and second

house of the sampler, the output of the delta inputs of which are connected to the corresponding modulator is connected to the input and output control, remember the input of the memory element, the output element, and the output sse;

characterized by the fact that, with the first input of the comparator, the accuracy and simplification of the second input to the RATE

discretization, it is entered into a log-multiplication.

Claims (1)

An adaptive torus containing a delta modulator connected by an input to the information input of the sampler, the information input of the sample-storage unit and the start input of the sawtooth generator, the output of which is connected through a series-connected storage element and a scaling element to the first input of the multiplication unit connected to the output by the second input sampling counter, the counting input of which is connected to the output of the comparator and the control input of the sampling block 1645971, the output of which is the output of the sampler, the output of the deltamodulator is connected to the control ratio rhyme, the first and second inputs of which are connected respectively to the input and output of the memory input of the storage element, which is distinguished by the fact that, in order to increase the accuracy and simplify the sampler, a log is introduced into it 5 of the element, and the output is connected to the first input of the comparator, connected by the second input to the EXIT of the multiplication unit.