SU1691767A1 - Device for measuring period of pulse sequence - Google Patents

Abstract

The invention relates to a pulse technique and can be used to measure a pulse filling period in sequences of burst. The purpose of the invention, the simplification of the device, is achieved by introducing the element OR 3, the delay element 9, the trigger 4 and the formation of new functional connections into the device. The device also contains counters 5,6, element 7, generator 8, form detector 10, start bus 1, input 2 and output 11 tires. 2 Il.

Description

The invention relates to a pulse technique and can be used to measure a pulse filling period in sequences of burst.

The aim of the invention is to simplify the device.

Figure 1 presents the block diagram of the device; 2 shows timing diagrams for his work.

The device for measuring the pulse pulse period comprises a start bus 1, an input bus 2, an OR 3 element, a trigger 4, counters 5 and 6, an AND 7 element, a generator 8, a delay element 9, a driver 10 and an output bus 11. The output of the counter 5 is through the connected element OR 3 and the element AND 7 are connected to the control input of the counter 6, the counting input of which is connected to the output of the generator 8, and the output is the output bus 11 of the device. The inverse output of the trigger 4 is connected to the zeroing input of the driver 10, the start input of which is combined with the input bus 2 and the counting input of the counter 5, and

the output through the delay element 9 is connected to the second input of the And 7 element. The synchronous input of the trigger 4 is connected to the start bus 1, and the reset input is connected to the first input of the OR 3 element, the second input of which is combined with the output of the driver and the control input of the counter 5.

The device works as follows.

The measurement cycle starts after presetting the counters 5 and 6 and setting trigger 4 on the inverse output to one (the preset circuit is not shown) and sending the start signal to the start-up bus 1. In the initial state, a unit level from the inverse output of the trigger 4 prohibits the start of the former 10. When the Start signal is applied (FIG. 2b), the trigger 4 on the inverse output overturns to the zero state (FIG. 2d) and thereby enables the launch of the former 10. The zero level at the output of the imaging unit 10 holds the counter 5 on the control input V in the storage mode.

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The zero level at the output of the counter 5 in the initial state permits switching of the trigger 4 according to the Start control signal and permits the passage of information from the output of the driver 10 through the OR 3 element to the first input of the AND 7 element.

The first pulse of the input sequence (Fig. 2a) starts up the shaper 10 (Fig. 2d), which is restarted with each successive burst of the stack. Having restarted with the leading edge of the last pulse of the packet, the shaper 10 holds at its output a unit level for the time TF (FIG. 2d), where Gf is the pulse duration of the shaper 10 generated by a positive differential voltage at its trigger input. Thus, the shaper 10 serves to form the system at the time of arrival of pulses, the duration of which exceeds the time interval between the first and last pulses of the packet (their leading fronts) on Tf. In this case, U is chosen to be longer than the maximum permissible period of the pulse following in a burst, but not exceeding half the time interval between the last pulse of the previous pulse and the first pulse of the next burst of pulses. The former 10, on the leading edge of the first pulse of the burst, begins to form a strobe, the unit level of which counter 5 translates into a counting mode. Consequently, counter 5 does not read the first burst of a burst, which allows counting in it the number of periods of input pulses (Fig. 2a) corresponding to the time interval between the first and last pulses of the bursts (the number of leading edges exceeds by one the number of periods between the first and last fronts img-jusov packs).

The delay element 9 is designed to isolate the m3 strobe formed by the shaper 10, a time interval whose duration is equal to the time interval between the first and last pulses of the packet. For this, the delay time t3 of the delay element 9 is chosen equal to Tf, taking into account the compensation of the delay of the element OR 3 (Fig. 2e, g). By collecting both strobe (forward and delayed) across AND to element 7 and connecting its output to the control input V of counter 6, it can be achieved that counter 6 counts the number of clock pulses received at its counting input from the output of generator 8 over time corresponding to the duration of the time interval between the first and last pulses of each pack,

As soon as the counter 5 counts a certain number K of the full periods of the measured frequency, then immediately at its output a single level is reached, which by the reset input trigger 4 is set to the single state by the inverse output (Fig. 2d), resetting shaper 10 at the entrance to zeroing (figd). In addition, a single level from the output of the counter 5 through the IL-3 element will allow the passage of information from the output of the delay element 9 through the AND 7 element to the control input

V counter 6. At the time after the arrival of the K-ro pulse at the output of the element 1/1 7, the zero level is reached, which, by the control input V, the counter 6 is transferred to the information storage mode. Since the unit level at the output of the counter 5 prohibits, via trigger 4, the start of the driver 10 until the next signal is received, after the start signal, the information at the outputs of both counters 5 and 6

until the arrival of this pair of control signals does not change. With this information, the duration of the period Tx of the measured signal is determined from the expression N

ix K-f8T

where K is the number of pulses in the counter 5:

N is the number of pulses of the reference chgst oty f3T generator 8 in the counter 6,

Frequency value - maybe Tx

obtained by means of a permanent storage device connected to the output of counter 6.

The summation of the bursts of the bursts in the counter 5 and the corresponding clock pulses in the scratch 6 makes it possible to refuse or use the computing block and simplifies the device when processing the parameters of interrupted pulse sequences.

Claims (1)

Apparatus of the Invention A device for measuring the pulse pulse period, comprising an input bus and a start bus, first and second counters, a generator, a driver and an AND element, the input bus connecting with the counting input of the first counter and the starting input of the imager, and the output of the second counter being the output bus devices, from the fact that, for the purpose of simplification, the OR element and the delay element are additionally introduced into it, also the trigger, the synchronous input of which is connected to the start shm, the reset input is combined with the output the first counter and the first input of the OR element, and the inverse output is connected to the zeroing input of the imager, the second input of the OR element being combined with the output of the imager, the input of the delay element and the control input the first counter, and the output through the element And is connected to the control input of the second counter, the counting input of which is connected to the generator output, the output of the delay element is connected to the second input of the element I.