SU1649572A1 - Computing unit for calculation of time interval relation - Google Patents

Abstract

The invention relates to automation and can be used in information and measurement systems. The purpose of the invention is to improve the accuracy of calculations and simplify the device. The device contains a pulse shaper 1, a one-shot 2, a NOT 3 element, an OR 4 element, a frequency multiplier 5, an AND 6 element, the first counter 7, a code comparison circuit 8, the second and third counters 9 and 10. The goal is achieved by eliminating redundant nodes and the introduction of new connections, which make it possible to eliminate the calculation error caused by the quantization of time intervals by the reference frequency generator. 1 il.

Description

I

(L

WITH

“H t

TO,

J

CD SP M

to

The invention relates to automation and can be used in information and measurement systems.

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

The drawing shows a block diagram of a device for calculating the ratio of time intervals.

The device contains a pulse shaper 1, a one-shot 2, a NOT 3 element, an OR 4 element, a frequency multiplier 5, an AND 6 element, a first counter 7, a code comparison circuit 8, a second and third counters 9 and 10, a first T1, a second T2 and a third K input tires

The device for calculating the ratio of time intervals works as follows.

Before the start of measurement, K pulses are strewn over the input bus 9 and the code corresponding to K pulses from the output of counter 9 goes to the first group of inputs of circuit 8, comparing code o. From the beginning of the work, the time intervals T1 and T2 come respectively to the input tires T1 and T2. At the time of arrival of the time interval T1, the driver 1 generates a short pulse signal, which through the element OR 4 enters the input of the frequency multiplier 5, while the element And 6 remains a closed zero signal from the output of the element NO 3. After the end of the time interval T1, the single vibrator 2 generates a short pulse signal, which through the OR 4 element is fed to the input of frequency multiplier 5, from the output of which. the pulse sequence begins to arrive at the pulse frequency.

mc -1k t,

which are through element 6,

The unit levels prepared for operation from the HE 3 element output and the T2 input bus are fed to the counting input of counter 7 "The moment of equality of the number of pulses recorded in counter 7 with the number of pulses equal to the multiplier of the frequency multiplier 5 stored in the counter 9 is fixed circuit 8 compares the codes, the pulse from the output of which enters the input of the initial installation of the counter 7 and zeroes it, and also enters the counter 10. This means that one time interval T1 was laid in the time interval T2. Next, the operation of the device

repeats. The frequency multiplier 5 continues to generate pulses with

by frequency

k-1 Moment of entry in per0

five

0

five

0

five

0

five

0

five

The K-th pulse counter corresponds to the end of the next time interval T1, which is completely stored in the time interval T2, which corresponds to the recording of the pulse from the output of the code comparison circuit 8 to the counter 10. At the end of the time interval T2, And 6 closes the pulses from the output multiplier 5 frequencies on the counting input of the counter 7. As a result, the counter 10 will be recorded. The number of pulses equal to the number of time intervals T1, which are completely within the interval T2 (the number P). In counter 7, the number of pulses N7 K ---- 1:, where

Ј T2 - PT1.

The invention provides an increase in the accuracy of calculations and simplification of the device by using to determine the moments of the end of time intervals of shorter duration, which are completely packed into time intervals of longer duration, the information contained in the pulse sequence that the frequency multiplier forms.

Claims (1)

Invention Formula A device for calculating the ratio of time intervals containing a frequency multiplier connected by an input to the output of an OR element connected by the first and second inputs to the outputs of a pulse shaper and a single vibrator, respectively, whose inputs are connected to the bus of the first time interval of the device and the input of the HE element connected the output from the first input of the element I, connected by the second input to the bus of the second time interval of the device, and the output to the counting input of the first counter connected by the input of the initial device The settings with the output of the code comparison circuit, the first and second groups of inputs of which are connected to the outputs of the bits of the first and second counters, respectively, and the outputs of the bits. The third counter is connected to the output of the code of the integer part of the result of the device, characterized in that. 516495726 that, in order to increase the accuracy of the device output, and the counting inputs of the counters and simplify the device of the highest and third counters are connected the course of the frequency multiplier is connected to the bus to input the division factor the third input of the element And the outputs of the device and the output of the comparison circuit bits of the first counter are connected to the codes, respectively. 1 with the output of the fractional part code