SU1181128A1 - Device for producing difference pulse frequency - Google Patents

Abstract

A device for obtaining a differential frequency of impulses containing three keys, two triggers and an element, the first and second inputs of which are connected respectively to the control outputs of the first and second keys and the outputs of the first and second triggers, the counting inputs of which are connected to the first inputs of the first and second keys respectively , the switching inputs of which and the switching input of the third key are connected respectively to the first, second and third input buses of the device, and the second outputs of the first and second keys are connected respectively directly to the first and second output buses of the device, the third output bus of which is connected to the output of the third key, the control input of which is connected to the output of the AND element, which is characterized by the fact that, in order to increase the reliability of the device’s operation, an additional 5 through which the third output bus // is connected to the reset inputs of the first and second triggers, the outputs of which are connected to the inputs of the OR element, the output of which is connected to the second input of the additional element I. I

Description

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The invention relates to a pulse technique and can be used in automation and measurement systems for obtaining the difference frequency of pulses and for selecting from two 5 pulse signals of a signal of a lower frequency.

The purpose of the invention is to ensure the reliability of the device by eliminating errors in the subtraction of pulse signals due to the long pulse duration at the trigger reset inputs.

FIG. 1 shows a structural electrical circuit of the device; in FIG. 2 - an additional example of the implementation of the device; in fig. 3 - timing diagrams for the operation of the device.

The device for obtaining the difference frequency of pulses contains triggers 1 and 2, keys 3-5, element 6, three input buses: bus 7 of the first pulse signal, 8 - the second pulse signal, and 9 - pulse and 25 pulses, three output tires 10-12, as well as the OR element 13 and the additional element AND 14, with the first and second inputs of the element 6 and 6 respectively connected to the control inputs of the first .3 and second 4 keys and to the outputs of the first 1 and second 2 triggers, counting the inputs of which are connected to the first inputs of the first 3 and second 4 keys, respectively, in Odes of which commutation, input and commutation of the third key 5 are connected respectively to the first 7, second 8 and third 9 input buses of the device, and the second outputs of the first 3 and second 4 keys are connected respectively to the first 10 and second 11 output buses of the device, third the output bus 12 of which is connected to the first input of the additional element I 14 and to the output of the third key 5, the control input of which is connected to the output of the element 6, wherein the outputs of the first 1 and second 2 flip-flops are connected to the inputs of the element OR 13 whose output is about It is connected to the second input of the additional element I 14, the output of which is connected to the reset inputs of the first 1 and second 2 triggers. Keys 3-5 are impulse keys with 55 control signal storage.

The device works as follows.

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In the initial state, the triggers 1 and 2 are in the state O, their outputs have the signals O, which are sent to the control inputs of the keys 3 and 4. On the buses 7 and 8 and on the buses 1012, the signals O are set, and on the bus 9 clock pulses that arrive at the switching input of the key 5. The first pulse fed to bus 7, pulse 16 (Fig. 3) arrives at the switching input of the key 3, switches to its first output, goes to the counting input of trigger 1 and switches it to 1, at the exit. the trigger in this case forms the front of the pulse 17 (Fig. 3g). The first applied to the bus 8, the pulse 18 (Fig. 36) is switched to the first output of the key 4 and switches the trigger 2 to the state 1, at the output of the trigger 2 this forms the front of the pulse 19 ((Fig. Back) At the control input of the key 5 sets the signal 1, the pulse 20 of the clock frequency to the bus 9 and the switching input of the key 5 (Fig. Sv), is switched to its output, a pulse 21 appears on the third output bus 12, and this pulse passes through the additional element And 14 to the reset inputs of the flip-flops 1 and 2 and resets them to the state O. The axis of the latter at their outputs and at the output of the additional element IL 13 sets the signals O, as a result of which the action of the pulse 21 at the reset inputs of the flip-flops 1 and 2 stops, therefore, the latter perceive the pulses arriving at their counting inputs before the end of the action of the pulse 21 at the output pin 12.

The impulse 22 from the bus 7 (Fig. 3a) switches the trigger 1 to the state 1 again, and the pulse front 23 is formed at the output of the trigger 1 (Fig. 3g). The impulse 24 from the bus 7 (Fig. 3a) is switched to the second output of the switch 3 and a pulse 25 appears on the first output bus 10 (Fig. Ze). The impulse 26 from the bus 8 (FIG. 3B) is switched to the first key of the key 4 and switches the trigger 2 to the state 1, with the output pulse 27 forming at the output of the trigger 2 (fig. H). which at both inputs of the element And 6 and, therefore, at its output and at

311811

Signals 1 appear in the control key input 5. Pulse 28 from bus 9 (Fig. Sv) is switched to the second output of key 5 and a 29 5 impulse appears on the third output bus 12 (Fig. Rear). This pulse through the element And 14 resets the triggers 1 and 2 to the state O, thus forming the decay of the pulses 23 and 27 (Fig. 3d, g). Similarly, pulses of 10 are 30-37.

Thus, pulses are transmitted to the output bus 12 from one of the input buses 7 or 8, having a lower frequency. Pulses 21, 29 and 30 15 (Fig. 3a) correspond to pulses 18, 26 and 34 on bus 8 (Fig. 36), and

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the pulses 31, 32 and 33 (Fig. 3) correspond to the pulses 35, 36 and 37 on the bus 7 (Fig. 3a). Pulses of the difference frequency of the pulses on tires 7 and 8 are passed to bus 10 if the frequency of the pulses on bus 7 is greater than the frequency of pulses on stud 8 (FIG. Z), and pulses of the difference frequency of pulses on tires 7 and 8 pass through bus 11, but if the frequency of the pulses on the bus 7 is less than the frequency of the pulses on the bus 8 (Fig. ZJ).

In the device for obtaining the difference frequency (FIG. 2), the functions of the And 6 element are implemented on the keys 5 and 15. Its operation is similar to the operation of the device shown in FIG.

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Claims (1)

A DEVICE FOR OBTAINING A DIFFERENT PULSE FREQUENCY, containing three keys, two triggers and an element And whose first and second inputs are connected respectively to the control outputs of the first and second keys and the outputs of the first and second triggers, the counting inputs of which are connected to the first inputs of the first and second the second keys, the switching inputs of which and the switching input of the third key are connected respectively to the first, second and third input buses of the device, and the second outputs of the first and second keys are connected respectively to the first and second output buses of the device, the third output bus of which is connected to the output of the third key, the control input of which is connected to the output of the And element, characterized in that, in order to increase the reliability of the device, an OR element and an And element are additionally inserted into it, through which the third output bus is connected to the reset inputs of the first and second triggers, the outputs of which are connected to the inputs of the OR element, the output of which is connected to the second input of the additional element I.