Method and system for adaptive speech enhancement using frequency specific signal-to-noise ratio estimates
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United States of America Patent
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Aug 1, 2000
Grant Date -
N/A
app pub date -
Sep 27, 1996
filing date -
Sep 27, 1996
priority date (Note) -
Expired
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Abstract
A method and system for adaptively filtering a speech signal in order to suppress noise in the signal. The method includes decomposing the signal into multiple frequency subbands, each having a center frequency, estimating a signal-to-noise ratio for each subband, and providing multiple filters, each filter designed for one of a number of selected signal-to-noise ratio independent of the center frequencies of the subbands. The method also includes selecting a filter for filtering each subband, where the filter selected depends on the signal-to-noise ratio estimated for the subband, filtering each subband according to the filter selected, and combining the filtered subbands to provide an estimated filtered speech signal. The system includes appropriate hardware and software for performing the method.
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