SU1336217A1 - Pulse series-to-single pulse converter - Google Patents

Abstract

The invention can be used in pulse signal processing devices for converting a series of pulses into single pulses. The purpose of the invention is to improve noise immunity - to achieve Pu .z.l by eliminating the operation of the converter from short-term interference. To achieve the goal, element 3 and the corresponding functional connections are additionally introduced into the converter. In addition, the converter contains an input bus 1, a pulse shaper 2, delay elements 4 and 5, trigger 6, an output bus 7. The pulse shaper 2 can be implemented, for example, on two single vibrators, one of which is started from the leading edge, the other is from the trailing edge of the pulse. The single-oscillator generates short pulses at its output, corresponding to the leading and trailing edges of the signal. 2 Il. 7 GS SO 05 GO

Description

The invention relates to a pulse technique and can be used in pulse signal processing devices for converting a series of pulses into a single pulse.

The purpose of the invention is to improve noise immunity by eliminating short-term interference operation.

FIG. 1 shows the electrical functional scheme of the proposed converter; in fig. 2 - time diagrams that show his work.

A pulse train to a single pulse contains an input bus 1 connected to the input of the pulse generator 2, the first output of which is connected to the information input of the first delay element 3 and the control input of the second delay element 4, and the second output to the information input of the delay element 4, and control element 3 delay, the output of which through the third delay element 5 is connected to the first input of the trigger 6, the second input of which is connected to the output of the delay element 4, and the output to the output bus 7.

The Converter operates as follows.

With a series of pulses (Fig. 2a), short pulses are formed at the first and second outputs of the pulse former 2 (Fig. 2b, c), corresponding to the time positions of the positive and negative edges of the input signal. Since the delay t, introduced by the delay element 3, is set less than the minimum permissible duration of the input pulse series, the pulses applied to the control input of the delay element 3 (Fig. 2c) at the instants of negative fronts of the input pulse series arrive already after , as the pulses corresponding to the positive edges (Fig. 2 b), will pass through the delay element 3 to the information input of the delay element 5 (Fig. 3 d).

The total delay t, -ft introduced by delay elements 3 and 5, and the delay t3 introduced by delay element 4 are set equal to the maximum value of the pulse period T in convertible series, so a pulse sequence appears at the output of delay element 5 Fig. 2 d). corresponding to the positive edges of the input series of pulses delayed by T, and the first pulse of this sequence sets the trigger 6 to one state (Fig. 2 g). At the output of the delay element 4 passes only one pulse (Fig. 2 e), corresponding to the delayed

the falling edge of the last pulse of the input series, since for all previous pulses received at the information input of delay element 4, this element

periodically reset by the signal (Fig. 2 b) from the first output of the driver 2 pulses. An impulse (Fig. 2e), passed to the output of delay element 4 with delay T relative to the trailing edge of the last impulse of the input series, returns trigger 6 to the initial zero state. Thus, the duration of the signal at the output of the trigger 6 (Fig. 2 g) is equal to the time interval between the first positive and last negative fronts

5 convertible series.

If a short single impulse of interference (Fig. 2a) with a duration less than the delay value t of the delay element 3 arrives at the device input, then the reset signal of the delay element 3 from the second output of the pulse former 2 (Fig. 2c) corresponds to a negative (back) signal the front of the interference pulse appears earlier than the signal from the first output of a forma l 2 pulses (fig. 2 b) will have time to go to the output of the delay element 3, therefore the output signal (fig. 2 g) of the delay element 3, and therefore the output the signal (Fig. 2 d) of the delay element 5 remains mc is equal to zero, the trigger 6 is in the initial (zero left) state (Fig. 2 g), and the pulse of interference does not appear at the output of the device. The pulse shaper 2 can be implemented, for example, on two single-oscillators triggered one from the front and the other from the rear of the edges. The single-oscillator generates at its output short pulses corresponding to the leading and trailing edges of the input signal.

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Claims (1)

Invention Formula A pulse train to a single pulse, containing an input bus connected to the input of the pulse former, the first output of which is connected to the control input of the first delay element, and the second output - with the information input of the first delay element, the output of which is connected to the first input of the trigger, the output of which is connected to the output bus, and the second input - to the output of the second a delay element, characterized in that, in order to improve noise immunity, an additional delay element is introduced in it, the information input of which is connected to the first output of the pulse generator, the control input to the second output form pulse maker, and the output - with the input of the second delay element. Figg