Ambient noise cancellation for voice communication device

Details Ambient noise cancellation for voice communication device Ambient noise cancellation for voice communication device

2005-12-20

2005-12-20

Harold, Jefferey F. (Department: 2646)

Telephonic communications

Substation or terminal circuitry

For loudspeaking terminal

C379S390030, C379S395000

Reexamination Certificate

active

06978010

ABSTRACT:
A system and method for reducing or entirely canceling background or ambient noise from a voice transmission from a communications device. A communications device, such as a mobile telephone, is configured with an ambient noise compensation signal generator that is connected between a microphone and a mixer. The original output of the microphone and a compensation signal generated by the ambient noise compensation signal generator are mixed together prior to being passed to a transmitter. In one embodiment a buffer is provided between the microphone and the mixer to help synchronize the timing of the signals to be mixed. In another embodiment a second microphone is employed to detect ambient noise.

REFERENCES:
patent: 4625083 (1986-11-01), Poikela
patent: 5754665 (1998-05-01), Hosoi
patent: 5917921 (1999-06-01), Sasaki et al.
patent: 5966438 (1999-10-01), Romesburg
patent: 6363344 (2002-03-01), Higuchi
patent: 2003/0044025 (2003-03-01), Ouyang et al.
Duplan Corp. v. Deering Milliken, Inc. 197 USPQd 342.

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