Interference pulse suppression circuit for radio receivers

Details Interference pulse suppression circuit for radio receivers Interference pulse suppression circuit for radio receivers

1975-08-14

1976-11-30

Safourek, Benedict V.

325480, H04B 110

Patent

active

039952207

ABSTRACT:
Radio frequency disturbance recognition circuits having their inputs tuned to different frequency bands by resonant circuits are coupled to the antenna input of a receiver to be protected through a decoupling stage that prevents excessive coupling and AND-gates are provided so that an interference blanking circuit will be operated to produce a momentary interruption of the low-frequency signal path only when a disturbance is detected by the radio frequency recognition circuits in both of their respective operating frequency ranges and at the same time a pulse disturbance is detected in the output of the receiver demodulator by a disturbance voltage detector circuit tuned to a frequency band higher than the frequency band of the low-frequency signal to be protected.

REFERENCES:
patent: 3304503 (1967-02-01), Walker, Jr. et al.
patent: 3889192 (1975-06-01), Schiebelhuth et al.

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