SU1698873A1 - Time-interval selector - Google Patents

Abstract

The invention can be used in information processing systems. The purpose of the invention, the extension of the measurement range, is achieved by introducing into each measuring unit controllable switches 1 and 2 elements AND 5, 6 and a counter 8. The device also contains delay elements 3, elements AND 4 and triggers 7. 1 Il.

Description

enters the input of the next measuring unit.

The switching of the controlled switch 1 ensures the arrival of the remainder of the duration of the measured time interval through the output of the first to the input of the second measuring units.

Switching the controlled switch 2 provides the receipt of the cut-off part of the pulse to the counting input, which operates on the leading edge, of the counter 8.

Since the time of the leading edge of the signal through the delay element 3 is equal to the time of the falling edge passing through the same delay element, the duration of the measured time interval will satisfy the condition

Tr 2t,

40

The measurement result is determined by the formula

mx z c; n.

i

where i is the number of the measuring unit,

to;

- the number fixed in

counter of the 1st measuring unit J

t is the weighting factor of the 1st measuring unit; n - the number of measuring units.

The measurement result is

Tx 43 3 + 8-2 + 5-2 + + + 2 1 + 1 О + 67 s.

In this case, the measurement error is determined by the quantization discrete value of the nth (for example 7) measurement unit.

Since the transit time of the measured time interval through each measuring unit is different, and measurements are carried out in cycles including the first m + 1 bits, when measuring the duration of one time interval, it becomes possible to reuse the same measuring units, which allows expand the range of measurements without increasing hardware costs.

Claims (1)

Formula of Invention A device for measuring time intervals, comprising n serially connected measuring units, each of which contains an element AND, a delay element and a trigger, characterized in that, in order to expand the range of measurements, each of the measuring units additionally introduces an element 0 five And, the element is NOT, two controllable switches and a pulse counter, the device input is connected to the input of the measuring unit, which is connected to the first inputs of the first and second elements And and the signal input of the first controlled switch, the first output of which is cut through the delay element connected to the second the input of the first element And with the signal input of the second controlled switch, which through the element is NOT connected to the second input of the second element And, the output of which is connected to the R input of the trigger, the S input of which is connected the output of the first element is And, and the direct output is connected to the control inputs of the first controlled switch and the second controlled switch, the first output of which is connected to the counter input of the counter, and the second is connected to the second output of the first controlled switch and connected to the output of the measuring unit, and The output of the nth measuring unit is the output of the device.