Noise blanker circuit

Details Noise blanker circuit Noise blanker circuit

H - Electricity

04

B

325/120, 179/5

H04B 1/10 (2006.01) H03G 3/34 (2006.01)

Patent

CA 1117605

AP-77900 NOISE BLANKER CIRCUIT 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 de- modulated 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.

304077

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