SU1309290A1 - Pulse selector - Google Patents

Abstract

The invention can be used in information measuring systems for monitoring pulse selection in duration. The purpose of the invention is to improve the noise immunity of the device. The pulse selector contains a generator of 1 clock pulses, a counter of 3 pulses, triggers 4 and 5, and elements AND 7-9. The introduction of the element AND-NE 6 and the driver 2 pulses on the front and decay of the selectable pulse creates such a device operation mode that when at the moment of recovery of the duration of the selected pulse at the output of the selector, an interference pulse arrives at the input, the latter will not affect the stability of the device . In this case, the input bus 10 will be connected to the selector only after the formation of the selectable pulse has been completed. 2 Il. so about so you about shch.1

Description

one

The invention relates to an impotent technique and automation and can be used in information measuring systems for monitoring pulse selection in duration.

The purpose of the invention is to improve the noise immunity of the device.

FIG. 1 shows a pulse selector circuit; in fig. 2 - time diagrams of work at the outputs of the elements entering the device.

The pulse selector contains a generator of 1 clock pulses, a driver of 2 pulses at the front and decay of a selectable pulse, a counter of 3 pulses, triggers 4 and 5, AND 6 elements, And 7–9 elements, input 10 and output 1 1 buses.

In the pulse selector, the clock pulse generator 1 is connected to the counting input of the pulse counter 3, the output of which is connected to the second inputs of the And 8 and 9 elements. The input bus 10 is connected to the first input of the And 7 element, the output of which is connected to the driver of the pulse 2, the outputs of which are connected to the reset reset inputs of the pulse counter 3 and to the corresponding inputs of the trigger 4, the forward output of which is connected to the first input of the AND 8 element, inverse to the second input of the AND 9 element and to the first input of the AND-NOT 6 element, the second input Wow connected to the output of the trigger 5, and the output - to the second input of the element And 7. The outputs of the elements And 8 and 9 are connected respectively to the first and second inputs of the trigger 5.

Pulse selector works as follows.

In the initial state, the triggers 4 and 5 are set to the zero position (installation circuits are not shown). The counting input of counter 3 receives pulses from the generator of 1. Periodically, a signal at the output of counter 3 confirms the initial half-face of trigger 5.

The selectable pulse arriving at the bus 10 passes through the element AND 7, opened to single signals from the output of the element AND-NOT 6, and starts the driver 2 pulses, which at the first output generates a pulse along the front of the selected one. This pulse triggers trigger 4 into one state and resets the pulse counter 3 to the initial state. The counter 3 pulses begins to count the number of pulses coming from the output of the generator 1.

The capacitance of the counter 3 pulses is selected from the condition that no impulses of interference pulses are output to the output, the duration of which is significantly less than the duration of information pulses, i.e. determined by the maximum permissible duration of the interference pulse.

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1309290

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The overflow pulse of the counter 3 passes through the element AND 8, opened by a signal from a single output of the trigger 4, to the input of the trigger 5 and overturns it, when

On the bus 11 of the device, the beginning of a selectable pulse begins to form. The end of the selectable pulse on the input bus 10 triggers the driver 2, while at its second output a pulse is generated by the decay of the selector my own.

0 This pulse returns the trigger 4 to the initial state, and at its inverse output a single signal appears, the opening element AND 9. At the same time, the pulse from the second output of the driver 2 resets the counter 3, and it starts counting the number of pulses from the generator output 1. This allows you to restore the duration of the selected impulse.

The coincidence in the signal of a signal from a single output of the trigger 5 and the inverse output of the trigger 4 ph o m ue e. ementhol; AND - NOT 6, while the disappearance of a single signal from its Y) 1 turn closes element 7. This allows the input spike 10 to be disconnected from the device at the moment of recovery of duration 1; se 1SC7 iruue: ch.) Im5 pulses at the output iiniio 1 1. Thus, if at the moment of arising () and,) lits.-inusp se.lektiruemogo imphms ::.; lihixo ic Since the interference at its input is interrupted, then this im1) is not for stability ie input type and chen to ce. IeKTOpy To.ibKo formation of a selectable pulse. The completion of the formation of a secured. Pulse of the pulse occurs at the moment of the appearance of an overflow pulse at the output of counter 3. This pulse G1 |) goes through (covered element I 9 and set, and sets tr1, -1ggsr 5 to its original state. N; n ( ) m the formation of HMiiv, iib; i on 11 ceases. The disappearance of impulse to the car 1 for the AND element - NOT (), ipn this step appears with the sig nal signal Y; 1me1gg I 7, k; 1 to the other in: The second subkey (m1a type i (J.

In this way. vhg) niiiiia is called connection to device.

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Claims (1)

The formula invented by: / Selector pmpu; | сосо ;;, contains; -; and:;, kuyu tire counter I.MPu.ChSOV. | -i4KS) av: first impulses, first and isi upoi i hera, first, second}) oh and third are ... lemg :) A, and I input inHi-ia ig / dklyuchma to iicpBOAiv input of the first element And, the output of the clock pulse generator o.clock to the c4eTii jv input of the pulse counter, the first inputs of the second and third elements And the connection; respectively, with the direct and inverse outputs of the first trigger, and the outputs of the second and third elements And, respectively, with the first and second inputs of the second trigger, the direct output of which is output of the device, characterized in that, in order to increase the mehoustoychivosti work, he introduced AND-NO element and pulse generator, first and second outputs of which are connected to a pulse counter and reset inputs respectively to oo o So L. , / {aw the first and second inputs of the first trigger, the inverse output of which is connected to the first input of the element AND - NOT, the second input of which is connected to the output of the device, and the output of the element AND-NOT connected to the second input of the first element And, the output of which is connected to the input of the pulse former, the second inputs of the second and third elements And are connected to the output of the counter. L Jw  J (ae 1 P Figg