Noise blanker circuit

Details Noise blanker circuit Noise blanker circuit

1977-06-27

1978-09-12

Martin, John C.

Amplifiers

Signal feedback

Combined with control of bias voltage of signal amplifier

325319, 325479, 325402, 330282, H04B 110

Patent

active

041141059

ABSTRACT:
A noise blanker circuit usable in a radio receiver is disclosed. Noise pulses in demodulated received signals are detected by a noise detector amplifier. These detected noise pulses are then processed by a control means which develops control signals that selectively control a blanking gate which is followed by a holding capacitor. The gate and holding capacitor combine to blank out noise in the demodulated signals in response to the production of the control signals. The control means includes an amplifier with an AC negative feedback loop that includes a varactor diode. A rectifier diode is used to develop a DC voltage proportional to the occurrence rate of noise pulses and this DC voltage biases the varactor diode such that noise blanking only occurs when the noise present on the received signal is below a predetermined rate of occurrence.

REFERENCES:
patent: 3140445 (1964-07-01), Myers et al.
patent: 3140446 (1964-07-01), Myers et al.
patent: 3167721 (1965-01-01), Broadhead, Jr.
patent: 3223936 (1965-12-01), Cook, Jr.
patent: 3500067 (1970-03-01), Davis et al.
patent: 3699457 (1972-10-01), Wright

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