System and methods for concealing errors in data transmission

Details System and methods for concealing errors in data transmission System and methods for concealing errors in data transmission

H - Electricity

04

L

H04L 1/00 (2006.01) G10L 19/00 (2006.01) G10L 19/12 (2006.01)

Patent

CA 2408890

The present invention provides a frame erasure concealment device and method that is based on reestimating gain parameters for a code excited linear prediction (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 the present invention improves the speech quality under various channel conditions, compared with a conventional extrapolation-based concealment algorithm.

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