SU1265689A1 - Digital meter of centre of rectangular video pulses - Google Patents

Abstract

The invention relates to radio measurements and can be used in digital measuring devices. The purpose of the invention is to increase the resolution of the device when measuring the center of short video pulses. The device contains the elements And t, 4 and 9, triggers 2 and 10, the divider frequency 5, the reversible counter 6 and the generator 8 counting pulses. To achieve this goal, a delayed pulse shaper 3 i and an accumulator 7 are introduced into the device to form new SL links between device elements.

Description

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The invention relates to the field of radio measurements and can be used in digital measuring devices. The purpose of the invention is to increase the resolution of the device when measuring the center of short video pulses. Fig, 1 shows a block diagram of the device; in fig. 2 - Times | Nye diagrams, which are related to his work. The digital meter of the center of rectangular video pulses contains an element AND 1, trigger 2, driver 3 delayed pulse, element 4, divider 5 frequency reversing counter 6, accumulating 7, generator 8 counting pulses, element 9 and trigger 10. The input bus meter is connected to one of the inputs of the element And 1, the first input of the trigger 2 and the second input of the generator 3 zade.rzhannogo pulse to the second input of the element And 1 plug the first output of the generator 8 of counting pulses and the first input of the element 4, the output of which is connected to the input of cases It has 5 frequencies, the second output of the generator 8 counting pulses is connected to the first input of element I 9 and input O of accumulating adder 7. The summing input of reversing counter 6 is connected to the output of element I 1, its subtracting input is with output of element I 9, and the output of reversing counter 6 — with one of the inputs of the trigger 10, the output of which is connected to another input of element 9. 9. The first, ...: input of the delayed pulse generator 3 is connected to the output of frequency divider 5 and the input Record accumulator adder 7J input. which is connected to the output of the trigger 2 and the second input of the element 4, the output of the generator 3 of the delayed pulse is connected to another input of the trigger 2 and the other input of the trigger 10, a known accumulator, adder, can be used as adder 7, the former of the former 7 is known. The device operates as follows. At the initial moment of time, in the absence of an input video pulse, the triggers 2 and 10, the frequency divider 5 and the reversible counter 6 are in the initial state and the pulses from the generator 8 of the counting pulses do not appear at their outputs. At the input of the resolution of the adder 7, there is a logic zero level and the pulses coming from the generator of counting pulses 8 to the input O set the adder 7 to the initial state. At the same time, the input unit is set to the logical unit level, and a code corresponding to the division factor of the 5 frequency divider is supplied to the information buses of the adder 7. After the arrival of the next video pulse, the center of which is necessary to determine (Fig. 2a), the element H 1 begins to perform time quantization by pulses with a frequency f / 2 received from the generator 8 of counting pulses (Fig. 2c5). And 1 (Fig. 2-6) is fed to the summing input of the reversible counter 6. Simultaneously, the leading edge of the video impulse triggers trigger 2 and to the input of the frequency divider 5 from the generator 8 of counting pulses, the pulse frequency and f / 2. If the conversion factor of the frequency divider 5 is chosen to be K, and N, then the time VK.§, where K. () is the frequency divider ratio of 5, then negative pulses appear at the output of the frequency divider 5, which are fed to the input. . An operation is performed to add a code corresponding to the contents of the memory register of adder 7 (not shown). The resulting amount is written to the memory register at the time of the fall of the signal. Recording with a signal at the input Resolution equal to one. This sum is used as a term for subsequent calculations, i.e. at receipt of the next signal to the input Record. At the time of termination of the rectangular video pulse, the pulses from element I 1 to the summing input of the reversing counter 6 are stopped. At the input of the divider 5 frequency pulses continue to flow. When the counter-divider 5 frequency overflows, a short pulse from its output goes to the input of the imaging unit 3 of the delayed pulse, to another input of which a signal equal to zero is given. At the same moment, in case of need to use information, external to the device in question, the code recorded in accumulator 7 is transmitted to a buffer memory device (not shown), from where it is extracted as necessary (calculations, indications, etc. .). The resulting code is proportional to the variable delay of the input signal and is equal to (Fig.2C)

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The signal from the output of the imaging unit 3, delayed relative to the pulse from the output of the frequency divider 5 by 0.10, 2 of the ISS, overturns the triggers 2 and 10, as a result of which the pulses go to the input of the frequency divider 5 and the pulses of the reverse counter 6 begin with the frequency of the following f .. through the element And 9 (Fig.2A). After a time equal to tjj, from the true position of the center of the video pulse, the reversible counter 6 returns to its original state and a pulse is formed at its output (Fig.2), 1 corresponding to the center of the video pulse being studied. This pulse overturns the trigger 10, the drive circuit of the meter to its original state.

The temporary position of the center of the video pulse can be determined by the formula

C - t - tj (,

where t is the temporal position of the impulse C at the output of the reversible counter 6, corresponding to the center of the video impulse relative to the marker impulse.

S F o rmula of the invention

A digital meter of the center of direct video pulses, containing three And elements, two triggers, a reverse counter, a frequency divider and a generator of counting pulses, the first input of which is connected to the first inputs of the first and second elements And, and the second output is connected to the first input the third element And, the second input of which is connected to the output of the first trigger, and the output to the subtractive input of the reversible counter, the summing input of which is connected to

0 by the output of the first element And, the second input of which is connected to the input bus of the meter and to the first input of the second trigger, the output of which is below. Key to the second input of the second elec

5 ment And, the output of which is connected -c. an input frequency divider, characterized in that, in order to increase the resolution of the meter when measuring the center of short video pulses, a delay pulse generator and accumulating adder, the input O of which is connected to the second output of the counting pulse generator, are entered, and the resolution from the output of the second trigger, and Input Record - with the output of the frequency divider and with the first input of the delayed pulse shaper, the second input of which is connected to the input bus of the meter, and the decoder is connected to the second input of the second the first input of the first flip-flops, the second input of the first flip-flop connected to the output of down counter loan.

Claims (1)

Claim Digital meter center straight- ^e coal videopulses comprising three AND gates, two trigger down counter ,. a frequency divider and a geyrator of counting pulses, the first input of which is connected to the first inputs of the first and second AND elements, and the second output is connected to the first input of the third AND element, the second input of which is connected to the output of the first trigger, and the output - with the subtracting input of the reversible counter, summing up the input of which is connected to the output of the first element And, the second input of which is connected to the input bus of the meter and to the first input of the second trigger, the output of which is connected to the second input of the second element And, the output of which is connected to . an input of the frequency divider, characterized in that, in order to increase the resolution of the meter when measuring the center of short video pulses, a delayed pulse shaper and an accumulating adder are inserted into it, the input 0 ”of which is connected to the second output of the counter pulse generator, the input“ Resolution ”- with the output of the second trigger, and the input Record - with the output of the frequency divider and with the first input of the driver of the delayed pulse, the second input of which is connected to the input bus of the meter, and the output of the sub-keys to the second input of the second first and second input of the first flip-flops, the second input of the first flip-flop connected to the output of down counter loan. ^and I -----------------1 t 1 t 1 III 11111 ΙΙΙΙΙΙΙΙΙΙΙΙΙΙΙΙΙ l b Research institutes spike i ε 1 X ¹ t Sz1 a -: —------ ^- ή IIIIIIIIIIIIIII t . ία / g _g e I 1 ¹ Tse --— Tr Figure 2