| 摘要 |
The present invention provides a frame erasure concealment device and method that is based on reestimating gain parameters for a code excited linear predictio n (CELP) coder. During operation, when a frame in a stream of received data is detected as being erased, the coding parameters, especially an adaptive codebook gain gp and a fixed codebook gain gc, 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 th e present invention improves the speech quality under various channel conditions, compared with a conventional extrapolation-based concealment algorithm.
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