SU1499313A2 - Device for measuring time intervals - Google Patents

Abstract

This invention relates to a measurement technique. The goal is to increase the device speed by recording the true value of the duration of the measured time interval in the pulse counter, for which elements HE 8, 10, shaper 5 pulses, one-shot 11, element 3 are entered into it. The device also contains 1 reference frequency generator, elements And 2, 12, shaper 4 pulses, the element OR 6, one-shot 7 and the counter 9 pulses. The device allows building an operation algorithm in such a way that after the measurement is carried out, the true value of the duration of the measured signal is stored in it. 2 Il.

Description

14)

3149931

The invention relates to a measuring technique and is an improvement of the known device according to the author, sv. No. 1218364.g

The aim of the invention is to increase the speed of the device by recording in the pulse counter the true value of the duration of the measured time interval, tO

The figure shows a block diagram of a device for measuring time intervals; Fig, 2 - time diagrams of the device,

A device for measuring time intervals contains a generator 1 of a reference frequency, the output of which is connected to the first inputs of elements 2 and 3, as well as a driver of 4 pulses, a driver of 5 pulses, 20 element OR 6, a single vibrator 7, an element HE 8, a counter 9 pulses, the element is NOT 10, the one-shot 11 and the element I 12, the output of which is connected to the input of the one-shot 11, connected by its output through the element NOT 10 to the third inputs of the elements 2 and 3 whose outputs through the element OR 6 are stitched to the counting input of the counter 9 pulses, the first input Element And 30 12 is connected through the element HE 8c with the second input of the element I 3 and with the output of the one-shot 7, whose input is under-; (it is connected to the output of the driver 4 of the pulses connected by its input 5 t; the input bus of the device, the second input of the element And 2 and the input shaper 5 pulses, the output of which is connected to the second input of the element And 12.: .-. 40

The shaper 4 pulses and the shaper 5 pulses operate on the leading and trailing edges of the input, the signal, respectively, the duration of ir; The output pulse of each minimum pulse duration. 3 measured pulse bursts,

The duration of the output pulse t & one-shot 7 lies within

50

 max tp bh htt t

where t-e Aiquc. The duration of the maximum inter-pulse interval in the measured pulse train} - the duration of the output g-pulse of the ng-puller

one

g

O

 5 0 5 0 5 0

r

0

five

34

Se min is the minimum period of the interpulse intervals in the measured pulse train,

Counter 9 pulses | is a totalizing counter; setting the counter to zero, the state before performing the next measurement

carried out by an R-input manually or automatically by the forward edge of the output pulse of an AND 12 element,

The duration of the output pulse tg of the one-shot 11 is equal to the duration of the output pulse ff, the one-shot 7,

In the initial state of the device for measuring time intervals, there is no signal on the input bus of the device, there is no impulse at the output of the single vibrator 7 and the pulses of the generator 1 do not pass through the AND 2 and 3 elements and, respectively, through the OR 6 element to the counting input of the counter 9, the initial state which can be any. There are no pulses at the output of the formers 4 and 5, as well as at the output of the element And 12 and the one-shot 11, There is a logic level 1 at the output of the element HE 8 and at the output of the element NOT 10,

When a signal with a duration of Gd (4 g, 2), which is a burst of pulses, arrives at the input bus of the device, the amplitude of the first signal impulse (logic level 1) gives permission for the second input of element 2 to pass through the generator 1 pulse, however, simultaneously generated from the leading edge of the first pulse of the input signal of the shaper 5, the pulse passes through the element 12 and starts the one-shot P. The output pulse of the one-shot 11 through the element HE 10 sets the level of logical O on the third input dah elements And 2 and 3, prohibiting the passage of a pulse of the generator 1 through the element And 2 at time j equal to the duration tg of the output pulse of the single-oscillator 11,

At the end of the first pulse of the input signal at the second input element And 2 sets the level of logic O, prohibiting the passage through the element And 2 pulses

generator 1, and from the rear (| rt of the first impulse of the input signal, shaper 4 generates a pulse that triggers the one-vibrator 7, the output impulse of which sets the second input of the And 3 element to the logical level 1 allowing the generator 1 to pass through the And 3 pulses the vibrator a 7 through the e-h moment NOT; 8 sets on the first input of the element AND 12 a logical O level, which prohibits (further) the passage through the element 12 of the pulse of the former 5, formed from the leading front of the second th input signal pulse.

At the moment when the second impulse of the input signal starts at the second input of element 2, a logical level 1 is set, allowing the generator 1 pulses to pass through the second element 2 to the first input of the element OR by recognizing the end moment of the second input signal at the second input of element 2 that prohibits the passage of the pulses of the generator 1 through the element II. From the trailing edge of the second impulse of the input signal, the driver 4 generates a pulse that triggers one-shot 7, an output pulse which sets at the second input of the element AND the logic level 1, allowing the passage of the pulses of the generator 1 through the element FROM to the second input of the element OR 6; At the same time, the output pulse of the one-vibrator 7 through the element NOT 8 sets the logical input O at the first input of the element 12 further) passing through the element 12 of the pulse input of the generator 5 formed from the leading edge of the third pulse of the input signal. This cycle of operation of the device is repeated for each subsequent pulse of the input signal. one signal.

Thus, in the case when / the duration of the first impulse of the input signal is longer than te of the output impulse of single-impurity 11, a bursts of generator 1 impulses appear at the output of element And 2, the number of impulses in which, beginning with the second, is proportional to the duration corresponding impulse

499313

the input signal, and the number of pulses in the first burst is proportional to the interval between the falling edge of the output pulse of the one-vibration 1 1 and the falling edge of the first pulse of the input signal; At the output of And 3 there appear bundles of generator pulses 1, the number of pulses in which 1Q is proportional to the duration T., the one-shot 7.

In the case when the duration of the first impulse of the input signal is less than D11 Cg, the output impulse is about the vibrator a II, the output of element I 2 appears to be bundles of oscillator pulses 1, the number of pulses in proportion to the durations of the corresponding ones, starting with

20 second, input signal pulses; At the output of element 3, an array of pulses of the oscillator appears .1, the number of pulses in which, starting from the second, is proportional to the length of 25 one-vibrator 7, and the number of pulses i to the first pack is proportional to the interval between the falling front of the output pulse of the one-vibrator 11 and the falling front of output pulse of one-shot 7,

Since the duration t of the output pulse of the one-shot 7 is equal to the length C ь of the output pulse of the one-shot II, then in any case

25 from the output of the element OR 6 to the counting input of the counter 9 will receive one batch of pulses of the generator 1, the number of pulses in which is proportional to the duration t of the input signal,

40 The number of pulses of this pack is counted by counter 9, where the result of performing the measure of the duration of the Cf, the time interval,

45 Algorithm of operation of the device when performing measurements of the signal duration, which is a single pulse (pulse signal) | similar (single pulse 5Q pulse train, the number of pulses in which is one),

The use of additional connections and elements in the proposed device for measuring the time of the 1st interval of 55 intervals allows the construction of an algorithm for the operation of the device in such a way that after performing the measurement, the true value of the duration of the measured signal will be stored in it.

7149931

Claims (1)

Invention Formula Device for measuring time intervals according to aut. St. No. 1218364, g, characterized in that, in order to increase speed, the first and second elements NOT, the second pulse shaper, the second one-oscillator and the third element fO AND, connected by their output to input, are entered into it the second one-shot one, the output of which through the first element is NOT connected to the third inputs of the first and second elements AND, the first input of the third element I is NOT connected to the output of the first single vibrator through the second element, and the second input of the third element I to the output of the second pulse shaper, the input of which is connected to the input bus of the device. & R P . J II1 And 1I II I I I 1 P L i five: Before I IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII r