Method and apparatus for non-speech activity reduction of a low bit rate digital voice message
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United States of America Patent
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Apr 9, 2002
Grant Date -
N/A
app pub date -
Sep 30, 1999
filing date -
Sep 30, 1999
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Expired
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Abstract
A technique is used in a speech encoder (107) that reduces non-speech activity of a low bit rate digital voice message. Speech model parameters that include quantized speech spectral parameter vectors are generated in a sequence of frames. A determination is made as to which frames of the sequence of frames are voiced frames and which frames are unvoiced frames. A consecutive sequence of frames of unvoiced frames is identified (2330) as an unvoiced burst when a length, N.sup.UV, of the consecutive sequence of frames exceeds a predetermined length, N.sup.s. A non-speech activity portion of the unvoiced burst is identified (2335-2365) and removed.
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