Discriminator responsive to uniformly spaced pulses utilizing normally damped resonant tank feeding threshold output circuit

Claim 1

IN A PULSE DECODING CIRCUIT FOR DISTINGUISHING BETWEEN UNIFORMLY DISTRIBUTED PULSES AND NON-UNIFORMLY DISTRIBUTED RANDOM PULSES IN AN INPUT PULSE TRAIN, THE COMBINATION OF A CONTROLLED DISCHARGE DEVICE, MEANS NORMALLY BIASING SAID DEVICE TO SUSTAIN CONDUCTION THERETHROUGH, AN OUTPUT CIRCUIT FROM SAID DEVICE INCLUDING A RESONANT TANK DAMPED BY THE CONDUCTION OF SAID DEVICE, AN INPUT CIRCUIT TO SAID DEVICE EXCITED BY THE INPUT TRAIN TO SUPPLY PULSES OVERCOMING THE BIASING MEANS TO ORDER TO CUT OFF SAID DEVICE AND HENCE, TO PERMIT THE TANK TO BEGIN OSCILLATION, SAID INPUT CIRCUIT INCLUDING MEANS FOR MAINTAINING SAID DEVICE CUTOFF FOLLOWING EACH PULSE FOR A PREDETERMINED PERIOD AND, IN THE ABSENCE OF PULSES DURING SAID PERIOD, FOR AGAIN PERMITTING THE BIASING MEANS TO CAUSE CONDUCTION OF SAID DEVICE AT THE EXPIRATION OF SAID PERIOD, SAID PREDETERMINED PERIOD BEING SHORTER THAN THE UNIFORM SPACING BETWEEN THE UNIFORMLY DISTRIBUTED PULSES SO THAT THE DEVICE CONDUCTS DURING EACH SUCH SPACING, WHEREBY THE UNIFORMLY DISTRIBUTED PULSES CAUSE CONDUCTION OF SAID DEVICE AT A REGULARLY RECURRING RATE TO BUILD UP OSCILLATIONS IN SAID TANK, THE RANDOM PULSES CAUSING CONDUCTION OF SAID DEVICE AT A NON-RECURRING RATE AND BEING EFFECTIVE DURING GAPS THEREBETWEEN LONGER THAN SAID UNIFORM SPACING TO CAUSE CONDUCTION OF SAID DEVICE FOR A SUSTAINED PERIOD IN ORDER TO DAMP THE OSCILLATIONS IN SAID TANK.