SU744622A1 - Device for determining pulse train repetition frequency deviation from the predetermined frequency - Google Patents

Description

dividing the frequency deviation of the pulse sequence from the set one, p

The aim of the invention is to improve the accuracy of determining the frequency deviation,

To this end, a device for determining the frequency deviation of a pulse sequence from a given one, containing R - S triggers, zero inputs of the first and second of which are connected to the zero output of the third trigger and to the first inputs of the first and second elements d-HE, connected by the outputs docTBeTCTBeHHO with the single and zero inputs of the fourth trigger, and the second input of the first element is NOT connected to the single output of the first trigger connected by the zero output with the second input of the second element AND NOT, the third input of which is connected to dinichnomu output of the second flip-flop coupled to a zero output to a third input of the first AND-NO element additionally introduced fifth and sixth flip-flops and the delay element coupled input with zero output of the third flip-flop,

single input of the first trigger and;

the first single input of the sixth tr1igger and connected by the output to the single input of the first trigger and the zero input of the fifth trigger, the single output of which is connected to the single input of the third trigger connected to the first zero input to the single output of the sixth, and the second zero, input to the input the device and the second unit input of the sixth trigger, the unit output of which is connected to the unit input of the second trigger, and the zero input of the sixth trigger is connected to the zero output of the fifth trigger.

FIG. 1 shows a block diagram of the proposed device; Fig 2 is a temporary work diagram. ,

The device contains the first, second, third, fourth, fifth and sixth l-a. the triggers 1-6, delay element 7 and the first and second elements NAND 8 and 9. The third, fifth and sixth triggers 3, 5 and 6 form a trigger with a counting input, made according to the scheme of three triggers, and the fifth trigger 5 It is the main trigger of this trigger with the Qualitative Entry, and the third and sixth triggers 3 and b are the switching triggers.

The proposed device works as follows.

The pulses of the controlled pulse sequence (Fig. 2a) are fed to the second zero input of the trigger 3 and the second single input of the trigger b, representing the counting input of the counting trigger, according to the scheme of three triggers 3, 5 and b. With the appearance of the pulse and zero output trigger 3

(Fig. 2b) the trigger 5 is set to one, and the triggers I and 2 are set to the zero state, with the logic elements; NANDS 8 and 9 prevent the impact of a parasitic signal from the simultaneous transfer of triggers 1 and 2. Trigger 4, which captures the sign of the deviation of the studied frequency. . If the period T is the following frequency

Q input pulses are less than a period of a given frequency (the period of a given frequency is equal to the delay time in delay element 7), then the next input signal pulse appears on the unit output of trigger 6 (Fig. 2c) before the pulse at the output of element 7 (Fig. 2d). This pulse from the output of trigger 6 will set trigger 2 to one state. At the same time, at the output of the element IE-9 (Fig. 2e), the pulse duration of the deviation of the frequency of the input signal from the specified deviation of the corresponding sign of the deviation in the form of the trigger state 4

5 (Fig. 2g). After arrival from the output of the element 7 delay pulse delayed for a period of a given frequency. To the zero input of the main trigger 5, the trigger with the counting input, the trigger

Q 5 through the circuit formed by the triggers 6 and 3, switches to the zero state, and the trigger 1 by the pulse from the output of the element 7 is set to one state, forming at the output

r element IS-HE 9 is the falling edge of the pulse deviation of the input signal from the period of a given frequency. The subsequent pulse of the input signal is reset again at the zero output of trigger 3, and then the work cycle will repeat. In this way, until the period of the frequency of the following impulses is shorter than the period given by the frequency, the pulse of the difference in periods following the specified frequency

5 will appear at the output of the element AND-HE 9 (Fig. 2e) with the difference sign being fixed as the state of the trigger 4.

If the period of the following frequency

Q input pulses are greater than the period of a given frequency, then the pulse at the output of delay element 7 is earlier than the input signal pulse from the single output of flip-flop 6 and sets flip-flop 5 to the zero state, and

trigger b - to a single state, and as a result, will prohibit the appearance of a pulse of the input frequency from a single trigger output b. In this case, the pulse from the output of the element 7 delay

Claims (3)

О will set the trigger 1 to a single state, forming at the output of the element AND-HE 8 (Fig. 2e) the leading edge of the impulse deviation of the period of the input signal frequency from the mismatch set with fixation of the mismatch sign on the trigger 4 (Fig. 2g). After the arrival of the second input pulse from the zero output of the trigger 3, the trigger 5 will be set to one, and the trigger 1 to the zero state, forming the output edge of the frequency of the input signal from the period of the specified frequency, then output cycle of work is repeated. Thus, as long as the period of the pulse frequency of the input pulses is longer than the period of a given frequency, a pulse of the period difference following the frequency of the input signal will appear only at the output of the AND-HE element 8 with the difference of the sign in the form of a trigger 4 .. The advantage of this device in relation to the known devices is the higher accuracy of the work, which is determined by an increased sensitivity to the minimum distinctive deviation of the part and speed. The sensitivity of the device is determined by the instability of the switching of the used logic elements, and the speed is determined by the frequency period of the input pulse sequence. The frequency range of the input signals is limited only by the frequency properties of the logic elements used. Apparatus of the Invention A device for determining the frequency deviation of a pulse sequence from a given one, containing ES triggers, zero inputs of the first and second of which are connected to the zero output of the third trigger and to the first inputs of the first and second AND elements, respectively, connected to the single and zero inputs of the fourth trigger, and the second input of the first element is NOT connected to the unit output of the first trigger connected by a zero output to the second input of the second element IS, the third input of which is Connected to the unit output i of the second trigger, connected by zero output to the third input of the first NAND element, characterized in that, in order to improve the accuracy of determining the frequency deviation, the fifth and sixth triggers and a delay element connected by the input to the zero are additionally introduced into the device the output of the third trigger, a single input of the fifth trigger and the first single INPUT of the sixth trigger and the output connected to the single input of the first trigger and the zero input of the fifth trigger, whose single output is connected The single input of the third trigger connected by the first zero input to the single input of the sixth trigger, and the second zero input to the device input and the second single input of the sixth trigger, the single output of which is connected to the single input of the second trigger, and the zero input of the sixth trigger is connected to zero exit of the first trigger. Sources of information taken into account in the examination 1. USSR author's certificate 402817, cl. G 01 R 23/10, 1970. 2. USSR author's certificate. No. 472447, cl. H 03 K 5/20, 1972. 3. USSR author's certificate number 377799, cl. .G 06 G 7/14, 1971 (prototype).