SU1378035A1 - Pulse selector by recurrence rate - Google Patents

Abstract

The invention can be used when implementing hardware of discrete automation, for automatic control of the period of pulse sequences. The aim of the invention is to increase the speed of the device while providing a band-delaying characteristic. The device contains two waiting multivibrators 1 and 2, the element AND-NOT 3, two triggers 4 and 5, the element 6, the inverter 7, the input bus 8, the output bus 9, the additional inverter 10, the additional element AND-HE 11 and the additional output bus 12. The proposed device determines the correspondence of the duration of each period of the input signal with the established limits of permissible values of duration. The operation of the device is explained in the time diagrams provided in the description of the invention. 1 hp f-ly, 2 ill. with S (L

Description

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The invention relates to a pulse technique and can be used in the implementation of technical means of discrete automation, for automatic control of the period of pulse sequences.

The purpose of the invention is to increase the speed of the device while providing band-delaying characteristics.

4G.1 shows the structural electrical circuit of the device; FIG. 2 shows timing diagrams explaining his work.

The device (Fig, 1) contains the first and second multivibrators I and 2, with the standby multivibrator 1 connected with the first input of element 3 AND-NOT and with the S input of the first trigger 4, the R input of which is connected with the output of element 3 AND-NOT and the R input of the second trigger 5, the Inverse output of the trigger A, and the direct output of the trigger 5 are connected respectively to the first and second inputs of element 6 I, the third input of which is connected to the input bus 8 through the inverter 7 and the output bus 9 to the output bus bus 9 through an additional inverter 10-connected to the first input g An additional element IS-HE 11, the output of which is connected to the additional output bus 12. Entrance of the waiting multivibrators 1 and 2 and the second input of the element 3 are IS-NOT connected to the input slot 8, the code of the second waiting multivibrator 2 is connected to the S-input trigger 5, the Second input of the additional element 11 is NOT connected to the output of the inverter 7.

The device works in the same way.

The input pulses of level O are fed to the inputs of the waiting multivibrators 1, 2, the outputs of which form two reference pulses, level 1, the duration of which determines the limit of transmission of the high and low frequencies.

The duration of the pulses (.) Level 1 of the waiting multivibrator. 1 determines the upper cut-off frequency of selection, and the duality of the pulses of the waiting multivibrator 2 determines the lower cut-off frequency (it is set to 2 ml. I ml al. I /

Input pulses and pulses from the output of the standby multivibrator 1 arrive at element 3 AND –NE, at the output of which reset pulses of the flip-flops 4, 5 are formed, and the reset occurs only after the end of the input pulses (at the falling front) of the O level. Back edges of the reference pulses from the outputs pending multivibrators 1, 2, the initial setting for the selection of the state of the flip-flops 4.5 is set.

At a low frequency of the input pulses, both of the waiting multivibrators 1, 2 produce pulses (level O) of the installation, set the triggers 4, 5 before the next input pulse enters the same state, 4TQ causes the pulses at the output of element 6 I, since the signal to the first input element 6 And comes from the inverse output of the trigger 4.

At a high frequency of the input pulses, the pending multivibrators 1, 2 do not produce installation pulses, as a result of which the triggers 4, 5 remain in the same states after the arrival of a reset pulse from the output of element 3 AND –NE, which also causes the absence of impulses at the output of element 6 AND .

When the frequency of the input pulses lying in the npJonyccani area of the selector, only the waiting multivibrator 1 generates an impulse setting, as a result of which the triggers 4, 5 are in opposite states before / entering the next input pulse arrive from the inverse output of the trigger 4 and from the direct output of the trigger 5, then the first and second inputs of element 6 I are set to levels 1, and through the inverter 7 to its third input receive inverse input pulses, as a result of which A pulse signal is generated.

When the supply voltage is turned on, in the initial state, when there are no 8 input level O pulses on the bus, the output of the waiting multivibrators 1, 2 is set to level 0 (fig.2o, b, c, moment to). In this case, on the element 3 of the IS-NES and on the inverse output of the trigger 4, the level 1 is set, and on the direct output of the trigger 5 - the level O

(figg, e, e, time t). At this moment, at the output of the inverter 7 and at the output of the element 6 I, the level O is set, and at the output of the inverter 10 - the level 1 (FIG. 2,, and, the moment to).

The first input pulse (fig. 2, moment ti) triggers the waiting multivibrators 1, 2, and level 1 pulses are generated at their outputs (fig. 2b, moment t,).

Since until the end of the first input pulse, the states of the flip-flops 4, 5 do not change (Fig. 2a, e, interval) while the output of the flip-flop 5 remains at the output of the first input pulse, at the output of element 6 And, then At the output of the trigger 5, after the end of the first period of the pulsed input signal lying in the selection zone, the level I is set (Figure 2e, interval tg-t). At the inputs of element 6 I, connected to the outputs of the flip-flops 4, 5, during the action of the input pulses, levels 1 are set (Fig. 23e, interval tg-t ,,), which enable

In addition, the output of the inverter is 10. 20, the first pulse does not pass (FIG. 2}, and, the interval,).

At the time of termination of the input pulse level O (figure 2, time t)

on the output of the element 3 AND-NOT, the passage of the output of the inverter 10 to the level O, which trigger-inverse input pulses (figure 2,

Lines 4, 5 are transferred to a state in which the inverse output of the trigger 4 is set to the level O, and

thirty

the output of the trigger 5 - level 1 (Figg, a, e, time t).

At a low frequency of the input pulses, when „„ „7 / Cd ,, where T„ „„ is the period of the input pulses, the waiting multivibrators 1, 2 return to the initial state (Fig. 2b, c, moments t ,, t, respectively ) before the next input pulse (FIG. 2c (, time tj)), at the same time, differences from level 1 to level O are formed at their outputs, which respectively set level 1 at the inverse output of trigger 4, and level O at trigger point 5 ( 2 a, e, moments t, t). This state of the flip-flops 4, 5 is maintained until the end of the next input pulse (Fig. 2, moment t) Because at a low frequency of the input pulses, the input pulse at the output de flip-flop 5 keeps the level O at the output of element 6 And the level O is maintained, and the output of the inverter 10 t is level 1 (Fig. 2, ", interval.) Thus, in the low-frequency region, the pulse input signal does not pass through the selector output.

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interval,) without distorting their duration with a delay determined by food by the speed of the inverter 7 and element 6 I. At the output of the inverter 10, pulses are formed with the polarity of which coincides with the polarity of the input pulses (Fig, 2i, interval t, - t ,,).

With a high pulse frequency when 2 ч h ABT. i Tu „„, at the outputs of the waiting multivibrators 1, 2, level 1 is retained (FIG. 2 & 8, -H-interval t, -t, 5), while the level O pulse from element 3 is IS-NOT trigger 4 is brought to a state where on its inverse output the level O is set (r., E, time t 1), which prevents 45 pulses from the output of the inverter 7 through the element 6 I. The output of the element 6 And in this case the level is maintained Oh, and at the output of the inverter 10 - level 1 (figure 2., ", the interval t, -t). The input pulses do not pass to the output of the inverter 10.

On bus 12, when the frequency of the following input pulses lies in the selection zone, there are no pulses, since in this case signals are inverse with respect to each other at the inputs of the element 11 AND-NOT. With the repetition frequency of the input pulses.

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When the frequency of the input pulses corresponding to the selection area, i.e. when „y, j ,, 7,.,

At the output of the standby multivibrator 1, after the input pulse arrives, a level 1 pulse is still formed (Fig. 2b, interval t -, - tg), the falling edge of which sets the initial state for the selection of trigger 4 (Fig. 2, moment tg) , and the output of the multi vibrator 2 is set to level 1 (Fig. 26, interval, o) at

this, at the output of the trigger 5 after the end of the first period of the pulsed input signal lying in the selection zone, level I is established (Figure 2e, interval tg-t). At the inputs of element 6 I, connected to the outputs of the flip-flops 4, 5, during the action of the input pulses, levels 1 are set (Fig. 23e, interval tg-t ,,), which enable

5 passing to the output of the inverter 10 inverse input pulses (figure 2,

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interval,) without distorting their duration with a delay determined by food by the speed of the inverter 7 and element 6 I. At the output of the inverter 10, pulses are formed with the polarity of which coincides with the polarity of the input pulses (Fig, 2i, interval t, - t ,,).

With a high pulse frequency when 2 ч h ABT. i Tu „„, at the outputs of the waiting multivibrators 1, 2, level 1 is retained (FIG. 2 & 8, -H-interval t, -t, 5), while the level O pulse from element 3 is IS-NOT trigger 4 is brought to a state where on its inverse output the level O is set (r., E, time t 1), which prevents 5 from passing pulses from the output of the inverter 7 through the element 6 I. At the output of the element 6 And in this case the level is maintained Oh, and at the output of the inverter 10 - level 1 (figure 2., ", the interval t, -t). The input pulses do not pass to the output of the inverter 10.

On bus 12, when the frequency of the input pulses lies in the selection zone, there are no pulses, since in this case the signals inverse with respect to each other are fed to the inputs of the element 11 NAND. With the repetition frequency of the input pulses.

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lying outside the selection zone, impulses pass to the bus 1.2. Thus, on bus 12, the selector has a band-hold characteristic. In this case, the selector can be used in automatic frequency search systems to stop searching when the frequency lies in a given range.

The capacitance of the level O pulses at the outputs of the waiting multivibrators 1, 2 at the boundaries of the transparency and delay region is close to zero. Since these pulses set the triggers 4, 5 always to a certain initial dp. Selecting the state before the arrival of the input pulses and the pulses from the output of element 3 AND –NE change the states of the triggers 4, 5 only after the end of the input pulses, distorted pulses are not passed to the output of the selector. .

The impulseable pulse selector selects the matching of the duration of each period of the input signal with the established zone of permissible values of duration. If the interval between adjacent input pulses (between the leading edges of the input pulses of level O) corresponds to the zone of allowable values, then irrespective of the input pulses, the second of the pulses with a delay determined by the inverter 7 connected in series by the element 6 AND goes to the output bar 9 of the selector.

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Claims (1)

1. pulse selector for the following frequency, containing the first and second waiting multivibrators, whose hollows are interconnected, and the output of the first waiting multivibrator is connected to the first input of the NAND element, the second input of which is connected to the input bus, and the element I, output which is connected to the output bus, which is distinguished by the fact that, in order to improve the speed of VIY, an inverter and the first and second triggers are introduced into it, the R inputs of which are connected to the output of the IN and NO elements, respectively, to the outputs of the first .and second waiting mu ti- .vibratorov and inverse vpsod first flip-flop and the direct output of the second flip-flop - respectively the first and second inputs of AND member, the third input of which via an inverter connected to the input of the first monostable multivibrator and the input bus. 2, The selector according to claim 1, which is different from the fact that in order to increase speed while ensuring the band-delaying characteristics, an additional series-connected inverter and an AND-NOT element are introduced into it, the input of the additional inverter is connected to the output bus, the second input of the additional element AND-NOT is connected to the output of the inverter, and the output of the additional element AND-NOT is connected to the additional output bus. 0 five 0 five t, t2 t3tlft5t6 tjigt FIG. 2 W 11