Audio circuit having noise cancelling function

Details Audio circuit having noise cancelling function Audio circuit having noise cancelling function

2006-04-04

2006-04-04

Grier, Laura A. (Department: 2644)

Electrical audio signal processing systems and devices

Noise or distortion suppression

Soft switching, muting, or noise gating

C381S094100, C381S071100

Reexamination Certificate

active

07024004

ABSTRACT:
An audio circuit has an function of removing noise signals before sending audio signals to a sounder. The circuit includes a mute detector for detecting a mute portion of the audio signals, an audio signal amplifier for amplifying the audio signals, and a noise canceler for canceling noise signals mixing with the audio signals by utilizing the noise signals picked up by the mute detector in the mute portion of the audio signals.

REFERENCES:
patent: 5727072 (1998-03-01), Raman
patent: 02-279026 (1990-11-01), None

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