Method for reducing noise distortions in a speech recognition system
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United States of America Patent
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Jan 9, 2001
Grant Date -
N/A
app pub date -
Oct 22, 1998
filing date -
Sep 9, 1998
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method for reducing noise distortions in a speech recognition system comprises a feature extractor that includes a noise-suppressor, one or more time cosine transforms, and a normalizer. The noise-suppressor preferably performs a spectral subtraction process early in the feature extraction procedure. The time cosine transforms preferably operate in a centered-mode to each perform a transformation in the time domain. The normalizer calculates and utilizes normalization values to generate normalized features for speech recognition. The calculated normalization values preferably include mean values, left variances and right variances.
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