Method and apparatus for mitigating noise in an output signal of

Details Method and apparatus for mitigating noise in an output signal of Method and apparatus for mitigating noise in an output signal of

1995-07-26

1997-09-09

Chin, Wellington

Pulse or digital communications

Systems using alternating or pulsating current

Antinoise or distortion

4552341, 4552451, 375345, H04B 1500

Patent

active

056663846

ABSTRACT:
An audio automatic gain control (AGC) circuit (301) employs a method (400, 500) and apparatus (300) for mitigating noise in an output signal (307) of the audio AGC circuit (301). The audio AGC circuit (301) or a circuit coupled to the audio AGC circuit, such as a speech encoder (302), determines (405) whether audio information is present in an input signal (137) to the audio AGC circuit (301). When audio information is not present, the audio AGC circuit (301) applies (411) a gain to the input signal (137) that is less than a current gain being applied, thereby mitigating noise in the audio AGC circuits output signal (220) when audio is not present.

REFERENCES:
patent: 3962549 (1976-06-01), Zuk
patent: 5299233 (1994-03-01), Asghar et al.
patent: 5319573 (1994-06-01), Corleto et al.
patent: 5410741 (1995-04-01), Cahill et al.
patent: 5412341 (1995-05-01), Walczak
patent: 5448620 (1995-09-01), Gershkovich et al.

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