SU382024A1 - DEVICE FOR MEASURING CORRELATION - Google Patents

Description

one

The invention relates to a digital electrical measuring technique and can be used to measure the correlation function.

Currently, digital multiplicative correlometers are known in which the measurement of the values of the correlation function is obtained by directly averaging the products of the ordinates of the studied processes.

The functional diagram of such a correlometer consists of input devices, an adjustable delay node, a multiplication circuit, an averaging device, and a recorder.

A disadvantage of the known devices is that each subsequent value of the correlation function is measured without taking into account information about the previous value.

The aim of the invention is to increase the speed by reducing the sample size during the transition from measuring the previous value of the correlation function to measuring its subsequent value, while the accuracy of the measurement is maintained by using the accumulated information from measuring the previous value.

The essence of the invention lies in the fact that in the proposed device, the outputs of the accumulator-subtractor of accumulating type are connected to the parallel inputs of a reversible counter through an additional rewriting unit, the parallel outputs of which are connected to the inputs of the first through another additional rewriting unit. Tires for addition and subtraction of a reversible counter are connected

with the trigger of the accumulator adder-accumulator sign type.

The functional diagram of the proposed device is shown in the drawing.

It contains analog-digital signal converters I, 2, control unit 3, unit 4 multiplying ordinates of signals, adder-subtractor 5 of accumulating type, rewriting scheme 6, 7, 8, reversible counter 9 for measuring and storing a number proportional to the value of the correlation function , trigger sign 10.

The device works as follows. The input signals x (t) and y (t) are converted by analog-digital converters / and

2 with the necessary time delay feAi generated by the control 3. The transformed input signal values x (t) and y (t) in the form of a parallel binary code are sequentially fed to block 4 multiplying ordinates. The obtained values of the products for the measurement steps are summed in the accumulator-calculator-calculator 5 of the accumulating type. When measuring the correlation function at the zero point (equal to zero), this

the amount code is parallelly rewritten via

rewriting circuit 6 of the control signal to the reversible counter 9. This code remains unchanged during the subsequent measurement and summation steps of the ordinates x (t) and t, (t + III).

After these signals are added together, the previous sum code stored in the reversible counter I through rewriting circuit 7 is applied to the adder-subtractor 5 by the control signal to subtract 5. Depending on the sign of the difference result, the trigger of sign 10 generates a signal to the addition bus or subtract the reversible counter then from the control unit 3 one or several pulses arrive at the serial input of the reversible counter (the number of incoming pulses is selected depending on the ratio of requirements for fast the relationship and accuracy of the determination of the correlation function). As a result of t cycles of change of the sum code, on the reversible counter 9 with the help of rewriting scheme 8, according to the control signal, it reads a code value proportional to the ordinate of the correlation function.

To measure the subsequent value of the ordinate of the correlation function in control unit 3, the delay time is changed (instead of Mi, (+1) 0 is set, and the sum code of the previous measurement cycle is stored in the reversal counter. After that, a new measurement cycle is performed input signal to a digital code, and. Parallel overwriting the code from the adder-subtractor 5 in reversible

counter 9 is made only once at the beginning of the measurement, with Mi being zero.

Thus, the speed of the proposed device is improved by reducing the 5 NIN of the sample size when moving from measuring the previous value of the correlation function to the subsequent one, while maintaining the total sample size.

measurement accuracy of the correlation function 0

Subject invention

A device for measuring the correlation function, containing analog-to-digital converters, the outputs of which through a multiplication unit are connected to the inputs of a totalizer connected to a character trigger, a control unit whose outputs are connected respectively to the control inputs

0 analog-to-digital converters, multiplication unit, rewriting unit, characterized in that, in order to increase the speed of the device, it contains additional rewriting units and a reversible counter,

5 wherein the outputs of the sign trigger are connected to the inputs of the addition and subtraction of a reversible counter, respectively, the bit inputs and outputs of which are connected through corresponding additional rewriting blocks to the bit outputs and the subtractor inputs, the rewriter block inputs are connected to the counter outputs of the reversing counter, controlling The inputs of the additional rewriting and reversing 5 counter are connected to the corresponding outputs of the control unit.