SU1631711A1 - Selector of pulse pairs - Google Patents

Abstract

The invention relates to a pulse and computing technique and can be used in information processing devices represented by pulse sequences with informative parameters enclosed in a pulse duration. The aim of the invention is to provide the possibility of selection of pairs of pulses, the difference in the duration of which is equal to a given threshold. The selector pairs of pulses contains the trigger 1, the counter 2 pulses, the elements And 3, 4, 12 and 14. the input bus 5, the formers 6 and 9 of the falling edge of the pulses, the element OR 8, the decoder 13, the output bus 15, the bus 16 reset. This goal is achieved by introducing block 7 for determining the difference in time intervals, delay element 10, element OR 11, and the formation of new functional connections. 2 Il. AND

Description

The invention relates to a pulse and computing technique and can be used in information processing devices represented by pulse sequences with informative parameters enclosed in a pulse duration.

The purpose of the invention is to enable the selection of pairs of pulses whose difference in durations is equal to a given threshold.

FIG. Figure 1 shows the electrical structure of the device; in fig. 2 - timing charts explaining the operation of the device.

The device (Fig. 1) contains a trigger 1. a pulse counter 2, the first and second elements 3 and 4, the first inputs of which are connected to the input bus 5 and the input of the first driver 6 of the falling edge of the pulses, and the outputs respectively to the first and second inputs of the unit 7 determine the difference in time intervals. The device also contains a series-connected first element OR 8, a second driver of the trailing edge 9 of the pulses and a delay element 10. The first and second outputs of block 7 are connected respectively to the first and second inputs of the second element OR 11, the output of which is connected to the first input of the third element AND 12. The outputs of counter 2 are bitwise connected to the inputs of the decoder 13. The output of the imaging unit 9 is connected to the first input of the fourth element And 14. the output of which is connected to the output bus 15. The first input element

ABOUT

WITH

OR 8 is connected to the reset bus 16, and the second input is connected to the output of the OR 11 element. The output of the delay element 10 is connected to the R input of the trigger 1, the reset input of the counter 2, and the reset input of the unit 7, the third output of which is connected to the second input of the AND 12 element , the output of which is connected to the counting input of the counter 2. The output of the decoder 13 is connected to the second input of the element 14, the output of the former 6 is connected respectively to the second inputs of the elements 3 and 4.

The selector pairs of pulses works as follows.

Previously, a pulse is applied to the bus 16, which, through the element OR 8, the back driver of the pulse and the delay element 10, sets the pulse counter 2, the block 7 and the trigger 1 to the zero state.

Consider the case when the pulses Ui (diminished) and U2 (subtracted), the durations of which are equal to and m, respectively, are arranged in time as shown in FIG. 2a and, in addition, ft TZ.

The operation of the pulse pair selector can be divided into two stages.

First stage. Measurement of the magnitude of the difference between two pulses ri and G2.

The input pulse Ui at time ti (Fig. 2a) goes through element 1 3 opened by trigger 1 to the first input of block 7 and permits the pulses Ui to pass the generator’s pulses to the counting input of the reversible counter, which is in block 7. time t2 pulse Ui ends and the number of pulses counted by the counter in the forward direction during time t (t2 - ti) is equal to Ni fo (t2-ti), (1)

where fo is the pulse frequency of the generator block 7.

After the end of the pulse Ui at the time moment g, the pulse shaper 6 generates a pulse corresponding to the trailing edge of the pulse Ui (Fig. 2g), which goes to the S input of the trigger 1 and switches it (Fig. 2b, c).

The next impulse 1) 2 at time t3 comes through element 1 4 opened by trigger 1 to the second input of block 7 and again the generator pulses begin to flow to the counting input of the reversing counter of block 7, which counts them in the opposite direction. At time t4, the pulse U2 ends and the number of pulses counted by the counter in the opposite direction over time (t4 - hz) is equal to

N2 fo (t4-t3) (2)

The summary code recorded in the reversible counter of block 7:

Np (Ni-N2) (3)

Formula (3) can be written as: Np fo (t2 - ti) - (t4 - ts)

Considering that m-hz T2, expression (4) can be represented as follows:

.. NP fo (ri-r2) fo AT

(five)

Thus, the code recorded in the reversible counter of block 7 is proportional to the difference in durations of a pair of pulses.

Second phase. Automatic generation of the difference in the duration of a pair of pulses.

At the moment of time and begins to form on the first output of block 7, the signal

equal in duration D (FIG. 2, d), which goes through the element OR 11 to the first input of the element 12, allowing the generator pulses to pass from the third output of block 7 to the counting input of the counter 2

pulses. During the time At, the counter counts the number of pulses Np proportional to the difference signal A.

The third stage. Comparison of the Ac signal with a given threshold.

If the number Np is equal to the specified selection threshold, then the decoder 13 is triggered (FIG. 2, h) and its output impulse arrives

to the second input of the element 14. At the same time, on the falling edge of the signal Ar, the driver 9 is activated (Fig. 2, g), the signal of which arrives at the first input of the element 14. At the simultaneous appearance of signals at the inputs of the element 14, the output of the last . On the output bus 15 of the device, a selection signal is formed (Fig. 2, and). Simultaneously, the signal of the driver 9, delayed by the delay element 10 (Fig. 2, k), causes the trigger 1, the block 7, and the counter 2 pulses to zero. .

If the number Np turns out to be less than the specified threshold, the decoder 13 will not work, and the state of the output bus 15 does not

will change.

If the number Np is greater than a predetermined threshold, then the decoder 13 will work, however, the state of the output bus 15 will remain unchanged, due to the non-simultaneous appearance at the inputs of the element And 14 signals of the former 9 and the decoder 13.

When a pair of pulses is input to the selector, in which the duration of the first

the pulse of the analyzed combination is less than the duration of the second pulse, (Fig. 2, a) the selector works exactly the same

Thus, only the difference signal A m is formed at the second output of block 7 (Fig. 2, e). The introduction of block 7 for determining the difference in time intervals, the delay elements OR 11 and 10, and the corresponding links allows one to obtain information on the combination of pairs of pulses whose difference in durations is equal to a given threshold.

Claims (1)

Claims An impulse pair selector comprising first and second elements I, the first inputs of which are connected to the input bus and the input of the first back edge generator of the pulses, the output of which is connected to the S-input of the trigger, the inverse and direct outputs of which are connected to the second inputs of the first and the second element is AND, and the R input is with the reset input of the pulse counter, the outputs of which are bitwise connected to the inputs of the decoder, the first input of the first OR element is connected to the reset bus, and the output is connected to the input of the second pho tors, rear the pulse front, as well as the third and fourth elements And and the output bus, characterized in that, in order to enable the selection of pairs of pulses, the difference in durations of which is equal to a given threshold, a delay element, a second element OR, and a unit for determining the difference in time intervals are introduced into it, the first and second inputs of which are connected with the outputs, respectively, of the first and second elements, And, the first and second outputs, respectively, with the first and second inputs of the second element OR, the output of which is connected to the second input of the first element OR, and with the first input of the third element And, the second input of which is connected to the third output of the flea determine the difference of time intervals, and the output - with the counting input of the pulse counter, the input the reset of which is connected to the reset input of the block for determining the difference of time intervals and with the output of the delay element, the input of which is connected to the output of the second driver of the trailing edge of pulses and the first input of the fourth element And, the second input of which is connected to the output of the decoder, and the output - to the output bus. P P P L d esh and to P FIG. 2 P P P