Stereo noise reduction circuit

Details Stereo noise reduction circuit Stereo noise reduction circuit

1976-06-16

1977-12-13

Griffin, Robert L.

325399, 325474, H04H 500

Patent

active

040630390

ABSTRACT:
A stereo noise reduction circuit is disclosed having circuitry responsive to the automatic gain control voltage generated within an FM stereo receiver for reducing the noise associated with low levels of the RF carrier. A first portion of the noise reduction circuit provides for out-of-phase noise cancellation when the automatic gain control voltage reaches a first level and a second portion provides for rolling-off the higher frequencies of the output audio signals when the automatic gain control voltage reaches a second level.

REFERENCES:
patent: 3673342 (1972-06-01), Muller
patent: 3823268 (1974-07-01), Modafferi
patent: 3952161 (1976-04-01), Gilbert et al.

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