Front-End Noise Reduction for Speech Recognition Engine

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United States of America Patent

APP PUB NO 20090248411A1
SERIAL NO

12413477

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Abstract

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VoIP phones according to the present invention include a microphone, which may be internal or external, and allow the user to communicate unobtrusively, check voice mail and conduct other activities in an environment which can be noisy in general and extremely noisy sometimes. Speech recognition functionally may also be used to generate and send touch tone or DTMF tones such as in response to call trees or voice recognition functionality used by airlines, credit card companies, voice mail systems, and other applications. A system and method of audio processing which provides enhanced speech recognition is provided. Audio input is received at the microphone which is processed by adaptive noise cancellation to generate an enhanced audio signal. The operation of the speech recognition engine and the adaptive noise canceller may be advantageously controlled based on Voice Activity Detection (VAD).

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Patent Owner(s)

Patent OwnerAddress
NOISE FREE WIRELESS INCPO BOX 70396 SUNNYVALE CA 94086

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Berstein, Alberto D Cupertino , US 16 413
Kathirvelu, Hariharan Ganapathy Milpitas , US 4 128
Konchitsky, Alon Larkspur , US 69 982
Kulakcherla, Sandeep Santa Clara , US 15 361
Ribble, William Martin San Jose , US 10 345

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