Automatic noise limiter

Details Automatic noise limiter Automatic noise limiter

H - Electricity

04

B

325/120

H04B 1/20 (2006.01) H03G 3/34 (2006.01) H04B 1/10 (2006.01)

Patent

CA 1070391

AUTOMATIC NOISE LIMITER ABSTRACT The output from a peak detector of a conventional radio receiver includes a recovered audio signal and a DC level. The disclosed noise limiter processes the detector output through both low pass and high pass filters. The low pass filter produces a DC signal representative of both the detector DC level and the recovered audio signal level. The high pass filter passes only the recovered audio signal. A semiconductor diode connects between the filter outputs, and the output of the noise limiter. For peak detector levels at, or below the 100% modulation level the diode is forward biased and passes the audio signal to the noise limiter output for further receiver processing. Peak detector levels exceeding 100% modulation, such as noise, reverse bias the diode whereby the audio signal is blocked from subsequent receiver stages.

274053

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