SU660221A2 - Pulse selector - Google Patents

Description

the input of an additional logical element I is connected to the input of the selector.

The structural electrical circuit of the selector described is shown in the drawing.

It contains a delay unit 1 consisting of an oscillator 2, a logic element OR 3, and a generator 4, a generator 5 strobe pulses, an AND 6 logic element, a recalculation block 7, a ban 8 logical element, a trigger 9, an OR 10 logic elements -12, logic element AND 13, additional logic element "prohibition 14, additional generator 15 strobe pulses and delay line 16. The selectable signal is fed to input 17, the output signal is removed from output 18.

The pulse selector works as follows.

The selection pulses pass through the delay line 16 and start the strobe pulse generator 15. The delay time is set so that, in sum, with half the duration of the strobe pulse, it is equal to the period of the pulses of the selected sequence. Strobe-pulses through the logic element "prohibition 14, which has permission for the prohibitory input, and go to one of the inputs of the logical element And 13, and to the other its input receives the input pulses. When coinciding with the strobe-pulse, the input impulse passes through the logical element OR 11 to the output 18 of the selector and overturns the trigger 9. The signal from the output of the trigger through the logical element OR 10 starts the generator of 2 half-strobes, which generates pulses whose duration is equal to half the duration of the selection strobe pulses , generated by the strobe pulse generator 5. The pulses of the half gates pass through the logic element OR 3 and the back front starts the generator 4 delays, from the output of which the rectangular pulses feed From the output of the generator 5 strobe pulses. The pulse duration of the delay generator 4 is set so that the middle of the strobe pulses coincides with the middle of the selectable signal pulses. The pulses from the output of the generator 4 and the generator 5 pass through the logic element 14 and close it. The output pulses from the generator 5 and the selected impulses are fed to the corresponding inputs of the AND 6 logic element, which selects the pulses passing through the logical element OR 11 to the output

18, The generator of the 2 half-gates is started only by the second pulse of the sequence, and subsequent start-ups by the pulses of the output sequence of the selector, which does not contain interference. If there are skip pulses in the selectable sequence, the generator of the half-gates does not start, the prohibition from the logical element "prohibition 8 is removed, and from the logical element" the prohibition 14 is not removed. The gate pulse generated from the impact of the previous omission of the useful signal, is fed to the input of the conversion unit 7 and through logical

elements 8 and 3 start the generator 4 delays and the generator 5 strobe pulses, from the output of which the impulses again arrive at the input of the conversion unit 7, etc. When the number in the selectable sequence is

of the missing pulses exceeds the coefficient of the recalculation block 7, the selector processes the specified number of gates, the prohibition is removed from the logic element 14, the feedback circuit is opened until the appearance

the first one has gaps of the selectable pulse, which resets the recalculation unit 7 to the initial state. By a signal from the output of block 7, trigger 9 is reset.

Thus, the selector eliminates the possibility of issuing false pulses, as well as their partial or total loss in the presence of interference before the selected sequence, which increases the reliability

received information.

Claims (1)

1. Iatent USA 3500069, cl. 307-247, 10.03.70. -I  I №p | /. --i l J PL at .to; i PI r i . ± LL.  , ir, --J if- I - - Th