Method and apparatus for detecting voice activity

Details Method and apparatus for detecting voice activity Method and apparatus for detecting voice activity

2007-11-27

2007-11-27

Storm, Donald L. (Department: 2626)

Data processing: speech signal processing, linguistics, language

Speech signal processing

Recognition

C704S210000, C704S215000, C704S236000

Reexamination Certificate

active

10781352

ABSTRACT:
Method and apparatus detect voice activity for spectrum or power efficiency purposes. The method determines and tracks the instant, minimum and maximum power levels of the input signal. The method selects a first range of signals to be considered as noise, and a second range of signals to be considered as voice. The method uses the selected voice, noise and power levels to calculate a log likelihood ratio (LLR). The method uses the LLR to determine a threshold, then uses the threshold for differentiating between noise and voice.

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Written Opinion of PCT/US04/04490.
Sohn, Jongseo et al., A Statistical Model-Based Voice Activity Detection, IEEE Signal Processing Letters, vol. 6, No. 1, Jan. 1999, pp. 1-3.

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