Automatic gain control in a speech recognition system
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United States of America Patent
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Nov 6, 2001
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app pub date -
Nov 6, 1998
filing date -
Nov 6, 1998
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Abstract
Energy normalization in a speech recognition system is achieved by adaptively tracking the high, mid, and low energy envelopes, wherein the adaptive high energy tracking value adapts with weighting enhanced for high energies, and the adaptive low energy tracking value adapts with weighting enhanced for low energies. A tracking method is also provided for discriminating waveform segments as being one of 'speech' or 'silence', and a measure of the signal to noise ratio and absolute noise floor are used as feedback means to achieve optimal speech recognition accuracy.
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