SU1219981A1 - Apparatus for determining standard deviation of pulse duration - Google Patents

Abstract

This invention relates to a measurement technique and can be used in statistical radio engineering. The purpose of the invention is to improve the accuracy of determining the estimate of the standard deviation of pulse durations with an unknown pattern of probability distribution. The device contains logic elements (LE) And 1 and 10, LE OR 2 and 11, main counter 3, RS-triggers 4 and 13, anti-coincidence element 5, averaging unit 6, indicator 7, frequency divider 8, ring counter 9, additional counter 12, the differentiating circuit 14, the generator of clock pulses 15, 1 Il. g (lu; o co 00

Description

one

This invention relates to a measurement technique and can be used in statistical radio engineering.

The aim of the invention is to improve the accuracy of determining the estimate of the standard deviation of pulse durations with an unknown pattern of probability distribution.

The drawing shows a functional diagram of the device for determining the standard deviation of the pulse durations.

A device for determining the standard deviation of the pulse durations contains a connected AND 1, OR 2, main counter 3, RS-flip-flop 4, anti-coincidence element 5, averaging unit 6, indicator 7, and also connected to the input devices serially connected frequency divider 8, ring counter 9, element 10, the first input connected to the input of the device, element 11 or 11, additional counter 12, RS trigger 13, and the code connected to the second input of element 5 anti matches and the second input element OR 11, the second input element And 1 is connected to the second output of the ring counter 9, the inputs of the flip-flops 4 and 13 through the differentiating circuit 14 are connected to the third output of the ring counter 9, the generator 15 clock pulses connected to the counting inputs of the counters 3 to 12 and the second input of the OR 2 element is connected to the output of the trigger 4, the output of the element 5 is connected to the input of the averaging unit b. t

The device works as follows.

At the input of the device receives a sequence of pulses, the standard deviation of the duration of which should be determined. The frequency divider 8 and the ring counter 9 set the cyclical operation of the device. In this case, at one of the outputs of the ring counter 9 alternatingly, there is a permitting voltage applied to the second inputs of the AND 1 or AND 10 elements during the input pulse of k pulses to the device, where k is the division factor of the frequency divider 8. The choice of k is determined by the required number

12

scrap of summable components to ensure the required accuracy of determining the standard deviation when changing the law of probability distribution of a random variable.

In the first cycle of the device, i.e. during the first k measured pulses, the resolving potential from the output of the ring counter 9 is fed to one of the inputs of the element I 1, to the other input of which the pulses come directly from the input of the device. Through the elements AND 1 and OR 2, these pulses arrive at

the control input of the counter 3, allowing 15 pulses from the generator output to pass 15 clock pulses with a follow-on period B d The number of clock pulses received into the counter 3 at the input device k time of the measured pulses

one

N, 1 T ;, o

where Tj is the duration of the i-ro pulse.

During the second cycle of operation of the device (second k measured pulses), the resolving potential from the second output of the ring counter 9 goes to one of the inputs of the second element AND 10. In this case, the next k pulses through the elements 10 and OR 11 are fed to the control input of the counter 12, to the counting input of which pulses are received from the generator output of 15 clock pulses. During the time of arrival at the input of the device of the second series of k measured pulses

counter 12 will go N clock

pulses defined as

2k

N i T- 2. 7-

At the beginning of the third cycle (the third series of k pulses) the pulse from the third output of the ring counter 9 through the differentiating circuit 14 enters the S-inputs of the flip-flops 4 and 13, respectively, transferring them to a single state. At the same time, the resolving potential from the outputs of the flip-flops 4 and 13 through the elements OR 2 and OR 11 goes to the control inputs of the counters

3 and 12, allowing the filling of these counters with pulses from the generator output of 15 clocks. As the counters 3 and 12 are filled,

at the outputs in TC, the pulses that go to the R-inputs of the flip-flops 4 and 13, transfer the latter to zero states, thereby stopping the further filling of the counters. The output signals of the flip-flops 4 and 13 also go to the inputs of the anti-matching element 5, which generates a signal other than zero at the output only at those times when the potentials of the input signals are not equal to each other, therefore, the output signal of the anti-matching element 5 will be generated which is equal to the time interval between the moments of state change of the triggers 4 and 13. The capacities of the counters 3 and 12 are the same and equal to N, therefore the time interval between the moments of filling the counters will be equal to

| dt,., t., -. | .E.OT

the time interval is fed to averaging unit 6, where the average duration of the sequence of these time intervals is estimated.

Claims (1)

Invention Formula A device for determining the standard deviation of pulse durations, comprising a pulse generator, first and second elements AND, a pulse counter, a trigger and a series-connected averaging unit and an indicator, the output is 1998814 A pulse pulse is connected to the first trigger input, characterized in that, in order to improve the accuracy of operation, the serially connected frequency divider, ring counter, differentiating circuit, and the first and second elements OR, pulse counter are additionally introduced into it. and the trigger, and 0 the output of the pulse generator is connected to the first inputs of the main and additional pulse counters, the second and third outputs of the ring counter are connected respectively to ) 5 first inputs of the first and second elements And, the second inputs of which are connected to the input of the frequency divider, and the output of the first element And connected through the first element OR to the second input of the main pulse counter, the second input of the first element OR connected to the output of the main trigger and the first the input of the element of anti-coincidence, the second input 25 is connected to the output of the additional trigger and to the first input of the second element OR, the second input of which is connected to the output of the second element AND, the output of the second element OR connected to the second input of an additional pulse counter, the output of which is connected to the first input of an additional trigger, while the second inputs of the main and additional triggers are connected to the output of the differentiating circuit, the output of the anti-coincidence element is connected to the input of the averaging unit.