SU762142A1 - Pulse train shaper - Google Patents

Description

The invention relates to a pulse technique and can be used in devices of automation and computing, in particular in the master software devices of control systems. ^five

A generator is known that generates a series of pulses from their continuous sequence by switching an input signal to the generator output using trigger devices (triggers), which are controlled by the output signal e of a counter counting the number of pulses received at its input. At the same time, the required number of pulses in a pack is ensured by setting the counter to the appropriate initial state, by carrying out; e my using a setting device And ·

Such a generator does not provide soot- _m sponds durations output and input pulses, particularly the first and last burst, in cases where the pulse sequence fed to the input of the generator series of unsynchronized with it a continuous pulse sequence generator

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The closest in technical essence to the present invention is a generator containing a counter, four elements ^ of coincidence, a driver unit, a control trigger, an auxiliary trigger, a trigger pulse shaper, and an additional pulse shaper [22.

This generator does not provide for the formation of a series of pulses in a wide frequency range, since the presence of a triggering pulse shaper. And an additional shaper of input pulses require certain temporal ratios of signals at their outputs, which imposes significant restrictions on the duration and repetition period of input pulses. ^one

The purpose of the invention is to expand the functionality of the device, and

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namely frequency daappson generator. pulse series.

This goal is achieved by the fact that the generator of a series of pulses, containing four elements from the stage, specifying ¹ ₅

the block, the control trigger and the pulse counter, the outputs of each digit of which are connected to the inputs of the first match element, and the inputs are connected to the outputs of the master block, the output of the second match element 10 is connected to the first control trigger input, the output of which is connected to the first input of the third match element , and the output of the third coincidence element is connected to the account-: · 15th input of the pulse counter, two additional NOT elements are added, the input of the first element is NOT connected to the output of the first coincidence element and the first input ohm second element- 20 ta matches, the second input of which is connected to the output of the second element

NOT and the first input of the fourth match element, the second input of which is connected to the output of the first element 25 NOT, and the output of the fourth match element is connected to the second input of the control trigger, and the second input of the third match element is connected to the input of the second element NOT. thirty

FIG. 1 shows a functional diagram of a generator of a series of pulses; / FIG. 2 - time diagrams explaining his work.

. The pulse train generator (see Fig. 35 1) consists of a pulse counter 1, a driver unit 2, coincidence elements 3-6, control trigger 7, logic elements 8 and 9 NOT, a source 10 trigger pulses and a source 11 ₄₀

input pulses and output bus 12.

The generator of a series of pulses works as follows.

Before starting the formation of a series of pulses, applying to the installation inputs of counter 1 from the master block 2 of binary code signals, counter 1 records the number corresponding to the inverted code of a specified number of pulses in the series. At ₅₀ this, at the output of the coincidence element 3, a single potential is formed (see Figs. 2, 3), the opening element 4 matches the first input and the closing element 6 matches the ₅₅ input to the second input by a zero potential appearing at the output of the element 8 NOT _K. the second input element 4 coincidence start pulse ls4

not less than half the period of the input pulses (see Fig. 2, V eap), as well as the input pulse signal inverted by the element 9 (see Fig.

2, V out. 9) - to the third input of the element 4 of coincidence, the last is opened in the time interval corresponding to the pause of the input signal (see Fig. 2, V out. 4, the interval-C -X 2.). Zero potential coming from the output of element 4 coincidence at the first input of the control trigger 7, the latter is set to the position at which a unit potential is formed at its zero output (see Fig. 2,

7, the moment Ι- "), the opening element 5 matches the first input. From this moment on, the input pulses are allowed to pass through the open element 5 coincidence at the output of the device and simultaneously to the counting input of counter 1. This moment, as can be seen from the time diagram of the voltages (see Fig. 2, the moment b), is ahead of the beginning of the formation of the first pulse in the series, since the permission to pass it to the output of the device enters during a pause preceding the appearance of the first pulse, and, therefore, the first pulse of the series is not distorted (see FIG.

2, \ out.)

• After the counter 1 is filled with pulses arriving at its counting input, a zero potential appears at the output of the coincidence element 3 (see FIG.

2, \ / out. 3, the moment H), the closing element 4 coincidence on the first input and the opening through element 8 NOT the element 6 coincidence on the second input. With the appearance at the output of element 9 NOT, and consequently, at the first input of element 6 of coincidence, of a unit potential corresponding to the moment of the end of the last pulse of the series (see Fig. 2, moment b), the output of element 6 of coincidence forms a zero potential ( see Fig. 2, V out. 6, moment b), overturning the control trigger 7 (see Fig. 2, V out. 7). At the zero output of the latter, there appears a zero potential, which closes the coincidence element 5 on the first input, preventing the passage of input pulses to the output of the generator. Thus, the the ice pulse, like the remaining pulses of the series, arrives at the output of the device without distortion (see Fig. 2,

V out.)

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The frequency range of the proposed device is determined only by the switching time of its elements, which are simple key schemes. Switching time of such circuits is very little _5, and provided higher than the frequency properties of the device.

Claims (1)

_{Claims 1θ} I A pulse train generator containing a master block, a control trigger, four coincidence elements and a pulse counter, the outputs of each digit of which are connected to the inputs of the first match element, and the inputs are connected to the outputs of the master block, the output of the second coincidence element is connected to the first control trigger input , the output of which 20 is connected to the first input of the third element of coincidence, and the output of the third element of coincidence is connected to the counting input of the counter 6 impulses that differ - with the fact that, in order to expand the functionality of the device, the first and second logical elements are NOT added to it, the input of the first element is NOT connected to the output of the first match element to the first input of the second match element, the second input of which connected to the input of the second element and the first input of the fourth element of the match, and the second input of the fourth element of the match is connected to the output of the first element NOT, and the output of the fourth element of the match is connected to the second input of the control trigger; the second input of the third match element is connected to the input of the second element NO.