SU613500A1 - Time interval-to-code converter - Google Patents

Description

one

The invention relates to information measuring, computational radio engineering, as well as to automation and can be used in digital time interval gauges with increased measurement accuracy.

The known time interval converter is a digital code containing a trigger of the first counter of the counter, an accuracy indication trigger, and a control trigger controlled by start and stop pulses, the zero output of which is connected to the control input of the first valve, and the unit one to the control input of the second The valve, between which the delay line is switched on, is configured with a half-period of counting pulses 1.

A disadvantage of the known converter is the larger error due to the non-synchronous arrival of start and counting emulsions, which is up to a whole period of counting pulses.

The aim of the invention is to reduce to the poly-period of the counting pulses the maximum error of the discrete counting caused by the non-synchronous arrival of the start of the counting pulses.

The goal is achieved by the fact that the time interval converter is a digital code containing a trigger for the first counter of the counter, an accuracy indication trigger, and a control trigger controlled by start and stop pulses, the zero output of which is connected to the control input of the first valve and the unit - to the control input of the second valve, between which the delay line is connected, configured with a half-period of counting pulses, a third valve is additionally introduced, and its control input is connected to the unit output a control trigger signal inputs of the first and third gates are connected to the input receiving counting pulses, the second fan output is connected to a single input trigger accuracy indication, and the output of the third gate - to the count input of the first flip-flop discharge counter.

The drawing shows the functional diagram of the Converter.

The converter contains an accuracy indication trigger 1, a trigger 2 for the first digit of the counter, a control trigger 3, a first 4, a second 5 and a third 6 gates, a delay line 7 tuned to the full period of the counting pulses, inputs 8 and 9 start and stop pulses, respectively, input 10 counting pulses and outputs 11 and 12.

The converter works as follows.

In the initial state, all triggers are set to zero, valve 4 is open, valves 5 and

6 are closed, at the outputs 11 and 12 are zero signals, to the input 10 they stop counting pulses.

At the moment of posting to the input 8 of the start-pulses, the trigger 3 overturns, the valve 4 closes and stops the flow of counting pulses to the delay line 7, and the valves 5 and 6 open, and a sequence of counting pulses to be further converted is started on the counting trigger 2.

Due to the non-synchronous arrival of the start and counting pulses, two cases can occur. If the start-impulse comes in the process of delaying the counting impulse in line 7, then at the end of the delay this impulse through the opened gate 5 nostunat to the single input of the trigger 1 and overturns it to the state "1. At output 11, a signal appears that indicates that the first counting pulse, which arrived at the input of trigger 2, is separated from the start-pulse by more than the current period. Therefore, all further meter readings are correct and corrections are not required.

If the start-impulse comes at the end of the delay process in line 7, then the closed valve 4 of the new impulses to the input line

7 does not pass, but the pulse does not return through the opened valve 5, since the valve 5 opens after the pulse leaves the line 7. The trigger 1 saves a bullet state, and at the output 11 its signal is absent. This means that the counter readings are overestimated by one, since the start-impulse is separated from the first counting impulse that entered trigger 2, less than half the period.

Information from the output of the trigger 1 of the display can be further used to make the necessary adjustments to the meter readings. The measurement error with the specified refinement does not exceed the absolute value of the mean period. Thus, in this converter

information was obtained about the moment of arrival of the start-pulse relative to the counting, with an error up to one-half of the period of the counting pulses with an asynchronous arrival of the start-pulse. The proposed device

It has a growth scheme and can be built on standard elements.

Claims (1)

1. USSR author's certificate No. 427468, cl. And OZK 13/20, 1972. 8 9