Method and system for adaptive speech enhancement using frequency specific signal-to-noise ratio estimates
First Claim
1. A method for adaptively filtering a speech signal to suppress noise therein, the method comprising:
- decomposing the speech signal into a plurality of frequency subbands, each subband having a center frequency;
estimating a signal-to-noise ratio for each subband;
providing a plurality of filters, each filter designed for one of a plurality of selected signal-to-noise ratios independent of the center frequencies of the plurality of subbands;
selecting one of the plurality of filters for each subband, wherein 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.
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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.
105 Citations
18 Claims
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1. A method for adaptively filtering a speech signal to suppress noise therein, the method comprising:
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decomposing the speech signal into a plurality of frequency subbands, each subband having a center frequency; estimating a signal-to-noise ratio for each subband; providing a plurality of filters, each filter designed for one of a plurality of selected signal-to-noise ratios independent of the center frequencies of the plurality of subbands; selecting one of the plurality of filters for each subband, wherein 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A system for adaptively filtering a speech signal to suppress noise therein, the system comprising:
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means for decomposing the speech signal into a plurality of frequency subbands, each subband having a center frequency; means for estimating a signal-to-noise ratio for each subband; a plurality of filters for filtering the subbands, each filter designed for one of a plurality of selected signal-to-noise ratios independent of the center frequencies of the plurality of subband; means for selecting one of the plurality of filters for each subband, wherein the filter selected depends on the signal-to-noise ratio estimated for the subband; and means for combining the filtered subbands to provide an estimated filtered speech signal. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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Specification