SU687588A1 - Frequency-to-code converter - Google Patents

Description

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The invention relates to a pulse technique and can be used in a measurement technique.

Known Converter containing triggers, differentiating circuits, elements AND, OR, shaper reference time interval, the frequency divider and the generator exemplary frequency 1.

The closest technical solution to the invention is a frequency-code converter comprising a difference interval trigger, one input of which is connected to the output of a reference time interval former counter and one input of a time interval former trigger, the other input of the difference interval trigger trigger is connected to the output of the time interval former time corresponding to several periods of following the input pulse sequence, the input of which through the input element And is connected to the output of the control trigger of the input element I, and the output to the input of the control trigger of the input: the element I and the input of the trigger for the selection of a time interval corresponding to several

periods of the input pulse sequence, another input of which is connected to the input of the time interval generator corresponding to several periods of the input pulse sequence, and the output - with the trigger input of the standard time interval generator, the output of which through

0 element And the generator of the reference time interval is connected to the counter generator of the reference time interval, another output of the selection trigger of the time interval corresponding to several periods of the input pulse sequence following the first element I is connected to the input of the first control e south frequency divider, moreover

0, the other input of the first element And the element And the driver of the reference time interval is connected to the generator output of the reference frequency, and the output of the trigger for selecting the difference time interval is connected to the input of the control trigger, the output of which through the first differentiating circuit is connected to the input of the OR element, and the other output through the second 0 differentiating circuit is connected to

the installation inputs of the counter generator of the reference time interval, the first controlled frequency divider, the period measurement counter of the input pulse sequence, and the control trigger of the input element And directly with the control input of the output element And whose pulse input is connected to the counter of the reference time interval generator and the output to the second input of the OR element, the outputs of which through the second elements AND are connected to the installation inputs of the counter for the reference interval in Yemeni, wherein the second inputs of second AND gates connected to outputs of the counter potential measurement repetition period of input pulse sequence 2.

Both of these converters have relatively low speed.

The purpose of the invention is to increase the speed of the converter.

To do this, the frequency-code converter contains a differential interval triggering trigger, one input of which is connected to the output of the reference time generator and one input of the trigger of the reference time interval generator, another input of the differential interval selection trigger connected to the output of the time interval generator corresponding to several the periods following the input pulse sequence, the input of which through the input element I is connected to the output of the control trigger input And, and the output - with the input of the trigger control of the input E & D and the input of the allocation of the time interval corresponding to several periods of the input pulse sequence, the other input of which is connected to the input of the time interval generator corresponding to several periods of the pulse sequence, and the output with the trigger input of the driver of the reference time interval, the output of which through the element Ti of the driver of the reference time interval is connected to the counter f the reference interval-time distributor, another output of the selection of the interval of time corresponding to several periods of the input pulse sequence, through the first element I is connected to the input of the first controlled frequency divider, and another input of the first element And the element And the generator of the reference time interval is connected to the output generator of an exemplary frequency, and the output of the trigger for allocating a difference time interval is connected to the input of the control trigger, the output of which through the first The alternating circuit is connected to the input of the OR element, and the other output through the second differentiating circuit is connected to the installation inputs of the counter generator of the reference time interval, the first controlled frequency divider, the period meter of the input pulse sequence and the trigger of the input element control And directly with the control the input of the output element And, the pulse input of which is connected to the counter of the generator of the reference time interval, and the output to the second input of the element OR, the output Which, through the second elements I, are connected to the installation inputs of the reference time interval generator, the second inputs of the second elements I are connected to the potential outputs of the counter for measuring the follow-up period of the input pulse sequence, the second controlled frequency divider, the first and second additional element I, the zero state decoder are entered neither, two additional differentiating circuits, an additional trigger and a reversible counter, whose inputs through the first and second additional elements And connected to a generator of exemplary frequency, and zero outputs through a zero state decoder to one of the additional trigger inputs, the other input of which through the first additional differentiating circuit is connected to the output of the differential interval trigger and the second input of the first additional element And, and the output of the additional trigger through the second additional differentiating circuit is connected to the second input of the control trigger and the second input of the second additional element I, the output of which is connected nen shaper with the input counter reference time interval, the input of the second controllable frequency divider is connected to the output of the first controllable frequency divider, adjusting the input to the input latch control input AND gate, and an output - to the input of the counter measuring the pulse repetition period of the input pulse sequence.

The drawing shows a structural electrical converter circuit.

The frequency-frequency converter contains a trigger 1 for allocating a difference interval, a counter 2 of the reference time interval generator, and a trigger 3 of the reference interval generator.

time interval, the Shaper 4 of the time interval corresponding to several periods of following the input pulse, the sequence of the input element And 5, trigger control 6 with the input element And 5, the trigger 7 of allocating the time interval corresponding to several periods of following the input pulse sequence, element. And 8 of the generator of the reference time interval, the first element AND 9, the first controlled frequency divider 10, the generator of the reference frequency 11, the control trigger 12, the first differentiating circuit 13, the element OR 14, the second differentiating circuit 15, the counter 16 for measuring the period of the input pulse sequence , output element And 17, elements And 18 and 19.

The second controlled frequency divider 20, the first and second additional elements And 21 and 22, the zero state decoder 23, two additional differentiating circuits 24 and 25, the additional trigger 26 and the reversing counter 27 are entered into the converter.

The frequency code converter works as follows.

In the initial state, all elements are And 5, 8, 9, 17, 18, 19, 21, 22

you. On signal

served

at input 28, the control trigger b tilts and opens element AND 5. Pulses of the frequency to be converted are fed to the input of the driver 4 and to the setup input of the trigger 7.

The trigger 7 overturns, opening element AND 9, generates a signal to trigger 3, which opens element 8. The pulses coming from the generator 11 of the reference frequency through element 8 are fed to the input of counter 2 of the generator of the reference time interval, and through element I the first and the second controlled frequency dividers 10 and 20 into period meter 16. In controllable dividers, frequencies 10 and 20 define division factors.

Using signals from the outputs of the driver 4 and the counter 2, a difference time interval is formed, which with the help of the trigger 1 and the trigger 26 is converted into a number of pulses.

In addition, the signal from the output of the imaging unit 4 triggers 6 and 7 are set to the initial state, as a result of which the elements AND 5 and 9 are closed. In the counter 16, the corresponding number is recorded that is proportional to the follow-up period of the input pulses. A signal from the output of counter 2 sets in the initial state trigger 7. Element And 8 closes.

The pulses from the input of the element And 21 are fed to the summing input of the reversible counter 27. At the end of the time interval from the output of the trigger 1, the signal p is received at the installation input of the trigger 12, which is tilted, opening the output element I 17. The pulse signal c

0, the output of the trigger 12 through the differentiating circuit 13 and the element OR 14 enters the pulse inputs of the elements 18 and 19, as a result of which the corresponding number is transferred to the counter 2.

In addition, at the end of the pulse, the signal coming through the diff. Ratio 24, overturns trigger 26 and opens element 22.

0 The pulses from the generator 11 are fed to the subtracting input of the reversible counter 27 and to the counter 2, which in this case acts as a divisor of the number of pulses.

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The restoration of the division factor in the counter 2 is performed by output pulses through the element OR 14 and the elements AND 18, 19.

When pulses arrive at the subtracting input of the reversible counter 27

0, this counter becomes in the zero state, and at the output of the zero state decoder 23 a pulse appears, which flips the trigger 26 to the initial state, as a result of which the trigger 12, from which the output element AND 17, the inhibitory potential is applied, AND 22 is closed, and the flow of pulses to the counter 2 is stopped.

Simultaneously with the signal from the output of the trigger 12, through the differentiating circuit 15, the counter 16 is set to the initial state, controlled by the frequency transformers TO, 20 and the counter 2. The same signal goes to the setup input of the trigger 6. The new conversion cycle begins.

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Claims (2)

1. Shl nd y B, M Digital measuring transducers and devices. - M.f Higher School, 1973, p. 159, fig. 312. 2. The author's meeting of the USSR № 428548, cl. H 03 K 13/20, 1974.