Disturbance signal detector for blanking circuit control

Details Disturbance signal detector for blanking circuit control Disturbance signal detector for blanking circuit control

1975-05-06

1976-05-18

Griffin, Robert L.

325349, 325377, 325475, H04B 112

Patent

active

039581810

ABSTRACT:
A frequency sensitive network responsive to frequencies somewhat above the useful signal band of a demodulated radio signal is interconnected with the inputs of a differential amplifier, so that the desired signal and the portions of the interference signals unaffected by the frequency sensitive circuit cancel out and a "stripped" interference signal is obtained which is fed to a transistor circuit that produces trigger pulses for a multivibrator, regardless of which side of the differential amplifier first produces a pulse. The multivibrator provides pulses to a blanking switch and also charges a capacitor in a RC network, in which charge accumulates when the control pulses are bunched closely in time and this effect is used to produce a bias for disabling the provision of trigger pulses to the multivibrator until the capacitor charge leaks off.

REFERENCES:
patent: 3413492 (1968-11-01), Schneider
patent: 3509468 (1970-04-01), Overlie
patent: 3538253 (1970-11-01), Braun

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