Method of speech recognition resistant to convolutive distortion and additive distortion
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United States of America Patent
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Jan 16, 2007
Issued Date -
N/A
app pub date -
Sep 20, 2002
filing date -
Dec 12, 2001
priority date (Note) -
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Abstract
A speech recognizer operating in both ambient noise (additive distortion) and microphone changes (convolutive distortion) is provided. For each utterance to be recognized the recognizer system adapts HMM mean vectors with noise estimates calculated from pre-utterance pause and a channel estimate calculated using an Estimation Maximization algorithm from previous utterances.
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