SU1596449A2 - Pulse selector by duration - Google Patents

Abstract

The invention relates to a pulse technique and can be used in devices for generating, issuing and processing information. The pulse selector contains the waiting multivibrators 1-3 and 7, the element OR 4, the prohibition element 5, the AND 6 and 8 elements, the input bus 9, the output bus 10. Eliminating the possibility of distorting the pulse duration restored on the output bus when entering the input bus after a pulse with a duration of х in, satisfying the selection condition, a pulse of interference with a duration of, n at time T, lying in the interval Τ in * 98 (Τ max-Τ n) at Τ n * 98T min, and also in the interval max * 98 T * 98 (Τ max + Τ in) for an arbitrary Τ n, where Τ min and Τ max - soo Respectively, the lower and upper selection thresholds allow improving the noise immunity of the device. 2 Il.

Description

The invention relates to a pulse technique and can be used in devices for building, input and processing information.

The purpose of the invention is to improve noise immunity by eliminating the possibility of distortion of the pulse duration restored on the output bus when it arrives at the input bus after the pulse with the duration satisfying the selection condition of the noise pulse with the duration f at time t lying in the interval fex t () at mn also in the Alahs interval t (tJ ofKc- - “m) with arbitrary f, where and respectively the lower and upper selekdai thresholds.

Fig. 1 shows a structural electrical circuit of the device; Fig. 2 shows timing diagrams for the operation of the device.

The device (Figs 1) contains from first to third pending multivibrators 1 - 3, and the inverse output of the waiting multivibrator 2 is connected to the first input of an element 4 OR, the output of which is connected to the forward input of the prohibition element 5 The direct output of the waiting multivibrator 1 is connected to the first input of the first element 6 And, the output of which is connected to the start input of the fourth standby multivibrator 7, the output of which is connected to the first input of the second element 8 AND „Start inputs of the waiting multivibrators 1-3 and the second input of element 4 OR are connected with. input bus 9 o Output element 8 And connected to the output bus 10 and the inverse input of the element 5 prohibition, and the second input with the inverse output of the standby multivibrator 1, the reset input of which is connected to the reset input of the standby multivibrator 2 and the output of the element 5 of the ban. The second input of element 6 AND is connected to the inverse output of the waiting multivibrator 2, the third input is connected to the direct output of the anticipated multivibrator 3 The third input of element 4 OR is connected to the direct output of the awaiting multivibrator 7c

- Pulse selector by duration works as follows. In the initial state on bus 9 (FIG. 2a) and bus 10 (Fig. 2h) there are levels O, at the outputs of the elements

4 OR (FIG. 2i) and 5 prohibition (Fig. 2k) levels 1, at the output of element 6 AND (Fig. 2e) - level O

On the leading edge of a pulse of arbitrary duration, arriving at the bus 9, the waiting multivibrator 1 forms a pulse on the forward (FIG. 26) and inverse (FIG. 2c) outputs.

duration C

which sets

the value of the upper selection threshold, and the standby multivibrator 2 generates a pulse of duration (FIG. 2d), which sets the value of the lower threshold of the selection on the back of the pulse on bus 9, the standby multivibrator 3 generates a short pulse (fig, 2e) „

If bus 9 receives an information pulse, the duration of which is less than the value of the lower selection threshold, then on its trailing edge on the code: element 4 OR a negative pulse is formed, which through the prohibition element 5 performs a forced reset of the waiting multivibrators 1 and 2, while waiting multivibrators 1 and 2 stop the formation of pulses at their outputs, and the short pulse generated by the waiting multivibrator 3 on the falling edge of the pulse on bus 9 does not pass to the output of element 6, since this element On the same level is closed on its first input. This completes the processing of the incoming pulse, and the selector returns to its original state.

Thus, the information impulse, having a duration less than the value of the lower threshold of selection, on the bus 10 selector does not pass

If an information pulse arrives on bus 9, the duration of which is in the selection range, then a short pulse generated by the waiting multivibrator 3 passes to the output of element 6 I and starts the waiting multivibrator -7, which generates a pulse of duration

1 LA “KS HFIGO 2g).

Claims (1)

Since the inputs of element 8 I receive two r-polarized impulses with durations shifted in time by an amount, this ensures that the output of element 8 I and bus 10 have a pulse with duration Jj, whose time delay relative to the pulse on bus 9 is equal to d, (P (s) If, after an information pulse, a noise pulse arrives on the bus 9, its duration is C and came at the moment t from the moment the selector was started, where C C / VIMH, then a waiting multivibrate is triggered on the leading edge of the pulse 2, At the time of formation of the rear edge of the pulse on the bus 9, on the first and second inputs of the element A OR there are levels O, one /, at its third input acts to 1, output level I from the output, the leading multivibrator 7o. forced resetting of waiting multivibrators 1 and 2 in the interval from Sgjf to, o, kc therefore excludes the influence of the interference pulse on the selection process of the information pulse in this interval. If the interference pulse arrives on the bus 9 at the time t sx + ddo1x) and has an arbitrary duration, this does not trigger the waiting multivibrators 1 and 2, since they are forcibly kept in the initial state on the reset inputs for a given time interval O, coming from the output of element 5 prohibiting, This excludes in the specified time interval the influence of the impulse interference on the selection process of the information impulse. Thus, the information pulse, which is the duration within the selection range, is selected by the selector with delay 2 and the duration on bus 10. If bus 9 receives an information pulse, the duration of which 15th exceeds the value of the upper selection threshold, then the short pulse generated And with the drive multivibrator 3 on its falling front, to the output of element 6, because by that time the waiting multivibrator 1 has already completed the formation of a pulse with a duration of P c x will be closed by element 6 and level on its first input. At this point, the processing of the incoming pulse is completed and the selector returns to the initial state. In this way, an information pulse having a duration longer than the value of the upper selection threshold does not pass to the selector bus 10, Formula of the Invention Pulse selector for durability as per aut. No. 1411957, characterized in that, in order to improve noise immunity by eliminating the possibility the distortion of the pulse duration restored on the output bus when arriving at the input bus after a pulse with a duration .Cj that satisfies the selection condition, an interference pulse with a duration at time t, lying in HF t (MO, ks-) at mi and also in the t interval: (Pjx- P arbitrary ff, where the min is the lower and upper selection thresholds, respectively, a barring element is inserted into it, connected between the output of the OR element and the reset inputs of the first and the second waiting multivibrator, the inverse input of the prohibition element is connected to the output bus, and the OR element is equipped with an additional input that is connected to the output of the fourth multivibrator waiting „