Automatic noise limiter

Details Automatic noise limiter Automatic noise limiter

1976-03-25

1977-08-16

Griffin, Robert L.

325482, H04B 110

Patent

active

040428834

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.

REFERENCES:
patent: 2422976 (1947-06-01), Nicholson, Jr.
patent: 2446565 (1948-08-01), Wasmansdorff
patent: 2453958 (1948-11-01), Andresen
patent: 2802939 (1957-08-01), Klehfoth
patent: 3064197 (1962-11-01), Ek
patent: 3102237 (1963-08-01), Elliott
patent: 3493871 (1970-02-01), Mason et al.

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