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

2008-05-27

2008-05-27

Chawan, Vijay (Department: 2626)

Data processing: speech signal processing, linguistics, language

Speech signal processing

For storage or transmission

C704S228000, C704S226000

Reexamination Certificate

active

07379865

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 gpand 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 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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De Martin et al., Improved frame erasure concealment for CELP-based coders, ICASSP Proceedings, Jun. 2000.
Kang, et al., “A frame Erasure Concealment Algorithm Based on Gain Parameter Re-estimation for CELP Coders,” IEEE Signal Proceedings Letters, vol. 8, No. 9, pp. 252-256, Sep. 2001.

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