SU437078A1 - Digital dispersion device - Google Patents

Description

one

The invention relates to specialized computer hardware for characterizing random processes.

A digital device for determining the dispersion is known, which contains a clock generator connected via the first circuit AND to a counter connected via the first TpHTreip to another input of the circuit AND, a centrifugal filter connected via a full-wave rectifier to the first input of the comparator, the second input of which is connected to the generator linearly voltage, the generator of the controlled frequency of the pulses connected through the second circuit AND to the cumulative counter.

The purpose of the invention is to simplify the device.

This is achieved by the fact that the device contains a second trigger, the output of which is connected to the control input of the generator of a linearly varying voltage and to the second input of the second circuit AND, and the inputs are connected respectively to the outputs of the comparator and the first circuit I.

FIG. 1 shows a block diagram of the proposed device; in fig. 2 - time diagrams.

The circuit contains a centering filter 1, a full-wave rectifier 2, a comparator 3, a generator 4 of a linearly varying voltage, a generator 5 of a controlled pulse frequency, a clock generator 6, a trigger 7, a circuit AND 8, a counter 9, a trigger 10, 5 circuit AND 11 and a cumulative counter 12. The device operates as follows. The processed voltage is fed through a centering filter 1 on the two-half-cycle rectifier input 2 (if the input

If the signal is centered, it is fed directly to the input of the rectifier via terminal A). The output of the rectifier 2 is connected to the first input of the diode-regenerative comparator 3, to the second input of which is fed a linearly varying voltage from the output of the generator 4, which is controlled by the trigger 10.

The process of determining the dispersion starts from the moment the button K is pressed, which triggers the trigger trigger 7 to one state, with

In which, short pulses from the clock jitter 6 with the period of the following Go are received, firstly, on the counter 9, the measurement time master and, secondly, on the first control input of the control trigger 10. To the zero state, the trigger 10 returns the comparator output pulse 3, appearing every clock when equality of the input signal modulus and the linearly varying voltage is achieved, ensuring the formation of rectangular pulses with a duration proportional to the modulus of the input signal quantized in time. The generated voltage of a linearly varying voltage is supplied to the generator 5 of the controlled frequency of the pulses, providing a sequence of short pulses with a frequency proportional to the linearly increasing voltage. These pulses, through the AND circuit 11, which controls the output pulses of the trigger 10, arrive at the counting inputs of the counter 12 and are recalculated by it. Now it is not difficult to calculate the number of Ni pulses arriving at the counter during the next clock cycle of operation of the circuit L, F (t) dt. Finally, the number Ni is determined by the formula N, - Klul ar,) - K, u1 (/ L). But the counter 12 counts the pulses. The generator 5 during the analysis time, which is selected from the condition of permissible accuracy of determining the variance estimate. In accordance with the selected analysis time, the capacity of the counter 9 is set, the overflow pulse of which is triggered by the start trigger 7, thus ending the next measurement cycle. The value of the variance estimate is determined by dividing the number accumulated in the counter 12 by the measurement time. This operation, when using a decimal counter and a correspondingly selected number of cycles, is reduced to a simple transfer of a comma in the total count. Subject of the Invention A digital device for determining dispersion, comprising a clock generator connected via a first AND circuit with a counter connected via a first trigger to another input of an AND circuit, a centering filter connected via a full-wave rectifier to a first comparator input, the second input of which is connected to a generator linearly variable voltage, a pulse frequency controlled oscillator connected via a second AND circuit to a cumulative counter, characterized in that, in order to simplify the devices a, it contains a second trigger, the output of which is connected to the control input of the generator of a linearly varying voltage and to the second input of the second circuit AND, and the inputs are connected respectively to the outputs of the comparator and the first circuit I.

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FIG. 2