System and methods for concealing errors in data transmission
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United States of America Patent
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May 27, 2008
Grant Date -
May 15, 2003
app pub date -
Oct 26, 2001
filing date -
Oct 26, 2001
priority date (Note) -
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status (Latency Note)
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Abstract
A frame erasure concealment device and method that is based on reestimating gain parameters for a code excited linear prediction (CELP) coder is disclosed. During operation, when a frame in a stream of received data is detected as being erased, the coding parameters, especially an adaptive codebook gain g.sub.p and a fixed codebook gain g.sub.c, of the erased and subsequent frames can be reestimated by a gain matching procedure. By using this technique with the IS-641 speech coder, it has been found that the present invention improves frame erasure concealment device and method improve the speech quality under various channel conditions, compared with a conventional extrapolation-based concealment algorithm.
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