US 4,051,390 AGranted

Parallel/time-shared variable time delay generator with common timing control and fast recovery

AssigneeThe United States of America as represented by the Secretary of the Navy

InventorCharlie F. Reeves

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Abstract

A video-blanker system for supplying blanking pulses to receivers including main delay one-shot for responding to a pretrigger pulse and establishing a time delay in response thereto by providing an output pulse of a predetermined width and an auxiliary delay one-shot having its input AND coupled to the pretrigger pulse and to the output of the main delay one-shot for responding to pretrigger pulses occurring during the timing cycle of the main delay one-shot. The outputs of the main and auxiliary delay one-shots are trailing edge discriminated and OR coupled to initiate a pulse width one-shot which supplies the required blanking pulse. The main and auxiliary delay one-shots include means for reducing the recovery times thereof, without affecting the quasistable periods.

Claims7

Dependent claims

A system for providing output pulses of a predetermined width after a predetermined delay from the receipt of a pretrigger pulse including a non-retriggerable, main delay one-shot for receiving said pretrigger pulse and having a predetermined timing cycle for providing said predetermined delay, and further comprising:

a first trailing edge discriminator connected to the output of said main delay one-shot;
auxiliary delay means operably coupled to said main delay one-shot for responding to pretrigger pulses occurring during said main delay one-shot timing cycle when said predetermined delay is greater than said predetermined width;
and a retriggerable pulse width one-shot connected to the output of said auxiliary delay means and operably coupled to the output of said first trailing edge discriminator for providing said output pulses of a predetermined width.

Dependencies are inferred from the claim text.