A fully adaptive comb filter for enhancing block-coded speech

Framing noise is a distortion present in block-coded speech that is caused by discontinuities at frame boundaries. A comb filter that is adapted nonpitch-synchronously has been developed that it is very effective in reducing this distortion. An optimal, minimum mean-squared-error approach is applied to determine the filter coefficients and adapt them to the short-time statistics of the speech. This filter has also proven effective in enhancing speech corrupted by other noise sources.<
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