SU813751A2 - Pulse train selector - Google Patents

Description

(54) PULS SELECTOR

one

The invention relates to a pulse technique.

According to the main author. St. No. 573868 is well known for a burst selector which contains an amplitude discriminator, a pulse shaper, a clock generator, a delay element, a shift register, a multi-input comparison element, a program block. The amplitude discriminator input is connected to the input source, and the output is connected to the input of the pulse width generator. The output of the clock pulse generator is connected to the input of the shift register and, through a delay element, to the trigger input, the second input of which is connected to the output of the pulse generator. The trigger outputs are connected to the control inputs of the shift register, the outputs of the DON discharge of which are connected to one input of the multi-input comparison element, the other inputs of which are connected to the outputs of the program block. The control input of the program block is connected to the output of the multi-input comparison element and to the output of the device 1.

The disadvantages of this pulse burst selector are low noise immunity, due to the fact that if there are interference pulses at the input, false information can be recorded in the shift register, which is then not reset, but is lowered in the register, and low repetition frequency of selectable pulse bursts, due to the long time to bring the shift register to the initial (zero) state.

The purpose of the invention is to increase noise immunity and expand the frequency range of selectable pulse bursts.

The goal is achieved by the fact that the pulse train selector contains an amplitude discriminator whose input is connected to an input source and the output with a pulse generator input, a clock generator whose output is connected to the input of the shift register and through the delay element to the input trigger, the second input of which is connected to the output of the pulse generator, and the output - to the control inputs of the shift register, the output of which bits are connected to the first inputs of the multi-input comparison element, the second inputs The ports of which are connected to the outputs of the program block, the control input of which is connected to the output of the multipath input element and to the output of the device, introduced an additional delay element and element I, the first input of which is connected to the output of the clock frequency generator, the second input to the inverse output of the trigger, and the output through an additional delay element to the reset input of the shift register.

The drawing shows a structural electrical circuit of the device.

Bundle selector pulses contains amplitude discriminator 1, shaper 2 pulses, trigger 3 shift register 4, 5 clock pulse generator, delay element b, delay element 7, multiple-input program block 8, input source 9, output bus 10, element And 11, an additional element 12 delay. The input of discriminator 1 is connected to source HiiKy 9, and the output through driver 2 to single input of trigger 3, the zero input of which is connected through delay element 6 to generator 5 output and to register 4 input, and outputs to register 4 control inputs connected to one of the inputs of the 1st; 7 c) avnepi, other inputs of which are connected to the outputs of the bits of the program block 8. The output of the comparison element 7 is connected to the output bus 0 and to the control input of the program block 8. The inverted output of the trigger 3 is connected to the first entry at the element 11, the second input of which is connected to the output of the generator 5. and the output through the delay element 12 to the reset input of the register 4.

The device works as follows.

In the outgoing state, trigger 3 and register 4 are in the zero state. Gamma pulses of arbitrary shape from source 9 arrive at discriminator 1, which standardizes the signals but de amilite. From the output of discriminator 1, the burst pulses go to the single input of the forshrower 2, after which they go to the single input of trigger 3. The clock pulses from the output of the generator o arrive at the input of register 4 and through ele-meter 6 delays to the input of the trigger 3. With these and. The pulse .1 and / is produced by information or "About from the output of trigger 3 for the first register bit 4 and the information shift in it. If a signal arrives at the single input of trigger 3 between two adjacent clock pulses, it is recorded and the next one after it is recorded with a clock pulse "1 into the first bit of register 4. The same pulse produces information shift in register 4, and after a time T equal to the time of action of this pulse, trigger 3 returns to the state "O. 1i: whether between TWO adjacent clocks

the pulse is not received, then at the output of flip-flop 3, the state "O" is saved, which is recorded with the next clock pulse at the first digit of register 4. The same pulse is used to shift the information in register 4. The information "1 from the output of flip-flop 3 will be sequentially recorded in register 4 with each measure. In program block 8, the selection interval is recorded in the following form: For the first discharge, "O, in subsequent bits," 1, is recorded, depending on the desired selection interval. The selection interval is defined as follows;

i sepeaim TACT D. TS. section-selection interval;

TGAKT - the period of the next clock

pulses;

n is the number of units in the code recorded in the program block 8.

The criterion of the end of the burst

The record “About to register 4” from the output of trigger 3 after writing “1. When Tpdchkm:

 the selection of the PACK by the selekami to the comparison element 7 from the output of the register 4 enters a code in which the number of MCHbHje units or more than the number of units recorded in program block 8. In both cases, the output signal of the comparison element 7 will not appear. At T „dts Tsel cymna element 7 compared with the output

0, register 4, a code is received, the number of units in which is equal to the number of units of the code recorded in the program unit 8. As a result of the comparison of the codes, a signal appears at the output of the comparison element 7, which indicates that the last bundle of emulsions is in the specified selection interval. This signal is fed to the output busbar 10, as well as to the control input of the software block 8 for issuing and subsequent potential code determining the selection interval. Upon receipt from the source 9 of the first pulse of the pack-. Trigger 3 is set to "1, while closing the inhibitory potential of the inverse output at the primary input element And 11, which remains closed

 on the first or second input for the duration of the pack. At the end of the burst, the next clock pulse, which writes zero information from the output of trigger 3 to register 4, opens the AND element

Q 11, from the output of which the pulse delayed by the delay element 12 for the time, longer time required for the operation of the comparison element 7, goes to the reset input of the register 4, sets it to the initial (zero) state. Thus, the time of the register 4 to its initial state after the end of the burst does not exceed two periods of the clock pulses. In the case of Tues

From the source 9 of the interference pulse, trigger 3 is set to "1. After this, the next clock pulse is used to write "1 information from the output of flip-flop -3 to the first digit of register 4. And next clock pulse opens element 11, the output pulse of which, through delay element 12, sets register 4 to its initial state.

Thus, if an impulse (s) of interference follow a selectable pulse train at a certain distance, then after the termination of the impulse (s) of interference the register. 4 is reset and, at the time of the arrival of the selectable pulse train, is in the initial state. The design features of the proposed device allow improving the noise immunity by neutralizing the effect of the noise recorded in register 4 by resetting it to clock pulses every time after trigger 3 is set to the zero state, as well as the allowed repetition frequency of selection

ь bursts of pulses due to a significant reduction in the time required to bring the register 4 to the initial (zero) state after the end of the bursts of pulses.

Formula inventions

Pulse selector selector St. No. 573868, characterized in that, in order to improve the noise immunity and spread the frequency range of selectable pulse bursts, an additional delay element and an And element are introduced into it, the first input of which is connected to the output of the clock frequency generator, the second input to the inverse output of the trigger, and you The passage through the additional delay element to the reset input of the shift register. Sources of information taken into account during the examination 1. USSR Author's Certificate No. 573868, cl. H 03 K 5/18, 1976.

Claims (1)

Claim Pulse selector selector St. No. 573868, characterized in that, in order to improve noise immunity and expand the frequency range of selectable pulse bursts, an additional delay element and an element I are introduced, the first input of which is connected to the output of the clock frequency generator, the second input - to the inverse output of the trigger, and the output through an additional delay element to the reset input of the shift register.