SU303633A1 - PULSE SIGN CORRELOMETER - Google Patents

Description

The invention relates to computer technology for instrumental determination of the characteristics of random processes.

An analog-to-digital sign correlometer is known for determining with reference a normalized normal processes normalized correlation function, comprising a centering filter, comparison nodes, a delay node, a time selector, a random signal generator, a reversible pulse counter, a frequency divider, a trigger and a push-button switch.

However, this device calculates for one measurement cycle only one ordinate of the correlation function, and therefore the process of obtaining a set of ordinates defining the correlation function curve is very long.

The purpose of the invention is to accelerate the measurement process of the set of ordinates of the correlation function, i.e., to obtain a multi-channel instrument without significantly complicating it.

This goal is achieved by the fact that the proposed correlometer contains a trigger control trigger, the output of which is connected to one of the control inputs of a time selector connected by a second input to the first comparison circuit, and the output connected to the delay unit, a zero input connected to the output of the delay block, appropriate

the largest delay of the pulse, and the single input is connected to the output of the time selector. The outputs of the delay unit are connected via a collective circuit to the control input.

the second comparison circuit, the outputs of which are connected via gates connected to the outputs of the delay unit, to the corresponding inputs of the channel reversible meters. The block diagram of the correlometer is shown in the schematic.

The input terminal / is connected via a centering filter 2 to the signal input 3 of the comparison circuit 4, the second input 5 of which is connected to a constant voltage source (at

drawing not shown) specifying the level of comparison. The output of the comparison circuit 4 is connected via a push-button switch 6 with a single input of the trigger 7 and directly with the signal input 8 of the time selector 9,

one control input 10 of which is connected to the output of the trigger 7, and the other control input L to the output of the trigger 12. The output of the selector 9 is connected to the input of the delay unit 13, the single input of the trigger 12 and

through the frequency divider 14 to the zero input of the trigger 7. Each input of the delay unit is connected to the corresponding input of the collecting circuit 15, through the valves 16 with the summing input 17 of the corresponding reverse input to the subtracting input 20 of the same counter. The last output of the delay unit, i.e. the output corresponding to the longest delay, is connected to the zero input of the trigger of control 12. The gates 16 are connected to the output 22 of the pulse comparison circuit 23, the second output 24 of which is connected to the inputs 25 of the gates 19. One signal input 26 of the pulse comparison circuit 23 is connected to the output of the filter 2, another signal input 27 is connected to a random signal generator 28, and control input 29 is connected to the output of the circuit 15. The device operates as follows. The implementation voltage x (t) of the random process applied to terminal 1, after centering by filter 2, enters input 3 of comparison circuit 4. Input 5 of circuit 4 is supplied with a constant voltage (its optimal value is 1.41 times the standard deviation of the process under investigation ). If the condition x (tj) E is fulfilled, then at the instant tj at the output of the comparison circuit 4 a pulse-sample appears. Since the initial state of the trigger 12 of the control of the samples is one, there is a resolving potential at the control input 11 of the selector 9 (the reliability of the initial installation of the trigger 12 into a single state is provided by duplication, i.e. by iodine on the trigger pulse of the counter reset. The day is not in the drawing shown). If there is a "permitting voltage" and at the second control input 10, the output pulse of the comparison circuit 4 passes through the selector 9 to the delay unit 13 and to the single input of the trigger 12. The latter is transferred to the zero state, and the input // of the selector 9 is fed "prohibiting voltage. While the trigger 12 is in the state "1 output pulses of the comparison circuit 4 does not pass through the selector. An impulse arriving at the delay unit 13, at certain time intervals appears successively at the outputs of this node. The delayed pulse is fed from the first output through the collecting circuit 15 to the control input 29 of the comparison circuit 23. In the circuit 23, the voltage x (t) of the centered implementation, which is fed to the input 26, is mapped to the voltage U (t) of the random generator signal 28, applied to input 27. A voltage U (t) independent of voltage x (t} is characterized by a uniform distribution of amplitudes from -A to + L, moreover (t) max- If at the time of pulse input from the first output of the delay unit At the input 29 of the comparison circuit 23, it turns out that X (tj + g) and (tj - t), then a pulse at the output 22, which passes through the first valve 16 to the summing input 17 of the counter 18 of the first channel (at the same time at the control input 30 of the valve 16 there is a permitting condition (tj + t). U (tj + t) at the time polling the comparison circuit 23, a pulse appears at the output 24, which arrives at the subtracting input 20 of the counter 18 through the valve 19. At 2m interval after applying the sampling pulse to the input of the delay unit, from its second output through the circuit 15 a pulse arrives at the input 29 of the comparison circuit 23. versus voltage ratio x (t) and and (t) at tj + 2t, a pulse appears either at output 22 or at output 24 of the comparison circuit 23. In the first case, the pulse passes to the summing input 17 of the reversing counter 18 of the second channel, in the second - subtractive input 20 of this counter. At tj + 3t, the pattern repeats, and the pulse from the third channel counter, etc., is fixed. The occurrence at the moment of the pulse on the lth output of the delay unit, in addition to the last one in this sample, polls the comparison circuit 23, which results in a pulse in the p-th channel counter, causes the flip-flop of trigger 12 to the initial (single) state. As a consequence, the "permitting voltage" is again applied to the control input 11 of the selector 9, and it is possible to pass through the selector of the second pulse-sample arising from the output of the comparison circuit 4 when condition X is satisfied (tj E. After the completion of the process similar to that of the first in the third sample, everything repeats, and so on. After a certain number of samples have expired, the reading of the channel's reverse counter will become proportional to the estimate of the ordinate Qs: (tT) the normalized correlation function of the case under study The total number of samples is set by a device consisting of frequency divider 14, trigger 7, and pushbutton switch 6. Prior to the start of measurement, trigger 7 is in the zero state, to input 10 of the time selector 9, the first the output pulse of the comparison circuit 4 transfers the trigger 7 to the single state, and the "permitting voltage" arrives at the input 10 of the selector. But the trigger trigger 7 in the single state, the emuls-sampling formed at the output of the comparison circuit 4, passes through the selector p 9 to delay unit 13 and single trigger input — Spy is also fed to frequency divider 14, which is a scaling circuit whose recalculation coefficient is set to 10 ° A / E to get a direct reference (b-integer number is changed by a switch that not shown in the diagram). After supplying 10M / Z: pulses, and at the output of frequency divider 14, a pulse is generated returning the trigger 7 to the zero state. As a result, the "permissive resolution of the channel counters is removed; they give an immediate estimate of the ordinates of the normalized correlation function, and the number b determines the comma position.

Subject invention

A forward reading pulse sign correlometer containing a centering filter associated with two comparison circuits, a time selector connected to a delay unit, a random signal generator, reversible counters, collecting circuits, valves, a frequency divider, a trigger and a push button switch that differs in that, in order to speed up the measurement process, it contains an additional trigger control trigger, the output of which is connected to one of the control inputs of a time selector connected by a second input to the first The comparison circuit and the output associated with the delay unit, the zero input of the trigger is connected to the output of the delay unit corresponding to the longest pulse delay, and the single input is connected to the output of the time selector, the outputs of the delay unit are connected via a collective circuit to the control input of the second comparison circuit, the outputs of which are connected via valves connected to the corresponding outputs of the delay unit to the inputs of the reversible meters.

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