Noise-dependent postfiltering
First Claim
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1. A method of filtering a speech signal, the method involving the steps of providing a filter suited for reduction of distortion caused by speech coding;
- estimating acoustic noise in said speech signal;
adapting said filter in response to the estimated acoustic noise to obtain an adapted filter; and
applying said adapted filter to said speech signal so as to reduce acoustic noise and distortion caused by speech coding in said speech signal.
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Abstract
A method of filtering a speech signal is presented. The method involves providing a filter (404) suited for reduction of distortion caused by speech coding, estimating acoustic noise in the speech signal, adapting the filter in response to the estimated acoustic noise to obtain an adapted filter, and applying the adapted filter to the speech signal so as to reduce acoustic noise and distortion caused by speech coding in the speech signal.
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Citations
31 Claims
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1. A method of filtering a speech signal, the method involving the steps of providing a filter suited for reduction of distortion caused by speech coding;
- estimating acoustic noise in said speech signal;
adapting said filter in response to the estimated acoustic noise to obtain an adapted filter; and
applying said adapted filter to said speech signal so as to reduce acoustic noise and distortion caused by speech coding in said speech signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 26)
- estimating acoustic noise in said speech signal;
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15. An electronic apparatus having a speech filtering device for a speech signal, the speech filtering device comprising:
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a filter suited for reduction of distortion caused by speech coding;
means for estimating acoustic noise in said speech signal; and
means for adapting said filter in response to the estimated acoustic noise, wherein said filter, when applied to said speech signal, reduces acoustic noise and distortion caused by speech coding in said speech signal. - View Dependent Claims (16, 17, 18, 19, 20, 21)
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