SU739727A1 - Pulse wifth signal selector - Google Patents

Description

(54) SELECTOR OF WIDE-PULSE SINTERS

 The invention relates to devices of impulse technology, in particular, to devices for processing radar signals. Signals are known that contain a three-input LAND element, minimum and maximum single vibrators, differential, differential element, delay element tU. The disadvantage of this selector is: the limited resolution of a given value of the duration of the output signal. Pulse-width selectors are known that contain a delay line, a coincidence element, a differentiating element 12. The disadvantage of these selectors is the lack of a delay in the input signal relative to the leading edge of the input pulse, which limits their scope. The object of the present invention is to enhance the functionality by providing the same output delay with respect to the leading edge of the input pulse. To achieve this goal, a device has a delay line whose output is; connected to the first input of the matching element, serially connected the first delay element and dJ differential element, a static trigger and serially connected second delay element, the output of which is connected to the input terminal, and a prohibition logic element, whose output is connected to the input of the delay line, and one of the inputs are connected to the output of the first delay element and to the first input of the classical trigger, the second input of which is connected to the output of the differentiating element, and the output is connected to the second input a matching element, wherein the input of the first delay element is connected to the output of the second delay element. FIG. 1 shows a structural electrical circuit of the device; FIG. 2 - time diagrams that show her work. The device contains a delay line 1, coincidence 2, the first delay element 3, differentiating element 4, static f

trigger 5, second delay element 6, prohibition log element 7.

The selector works as follows.

Input selectable pulses arrive at the delay element 6 of the leading edge. The length of the delay element 6 is chosen equal to the minimum duration of the selected tlpulsoat. Thus, at the output of the delay element 6, only those impulses whose duration is higher than the minimum selection time appear. However, the time interval at the output of the delay element 6 between the trailing edge of the previous one and the leading edge of the subsequent pulses increases by the amount of delay of the selected pulses reduced by This value;

At the moment of the rising edge of the pulse from the output of the delay element 6 to the output of the differentiating element 4, a short pulse appears, setting the trigger 5 into the single state or confirming the state if the trigger is already in it. Simultaneously, the pulse from the output of the delay element 6 is fed to the input of the logical

the prohibition element 7 and the input element of the delay 3 of the front front of the pulse. The magnitude of the delay of the forward pulse in the delay element 3 is chosen equal to (.-- t:, j the width of the time gate of the selection, where T is the maximum duration of the selected pulses. In the event that the duration of the input pulse lies within the time limits BopoT T:, Cg, x t ... exit

the delay element 3 is supported by the state of logical 1, which permits the passage of a pulse from the output of the logic element, the prohibition of 7 to the input of the delay line 2. The magnitude of the delay of pulses in lithium of delay 1 is chosen from the condition (, -t) tgd (ks

Thus, in time, after the pulse arrives at the selector input, the selectable pulse is separated at the output of the coincidence circuit. If an impulse with duration r t acts on the selector at the time, then after time at the output of the delay element 3 a negative

impulse, set by its leading edge trigger 5 to the zero state. At the same time, a negative impulse from the output of the delay element 3 triggers the logical element prohibition in such a way that when the input selectable impulse is in duration, the impulse duration at the start of the pulse does not exceed the MoiKc MMH value. Since the trigger 5 is set to the zero state before a pulse appears from the output of the delay line 1, no pulse is output at the output of the matching circuit. Consequently, the delay time of the output pulses relative to the input pulses is constant.

Claims (2)

1. USSR author's certificate No. 516186, cl. H 03 K 5/18, 1974.. 2. USSR author's certificate in application number 2460550, cl. 10.03.77 (prototype).