Speech coding system to improve packet loss concealment

Details Speech coding system to improve packet loss concealment Speech coding system to improve packet loss concealment

2011-08-30

2011-08-30

McFadden, Susan (Department: 2626)

Data processing: speech signal processing, linguistics, language

Speech signal processing

For storage or transmission

Reexamination Certificate

active

08010351

ABSTRACT:
A speech coding method of significantly reducing error propagation due to voice packet loss, while still greatly profiting from a pitch prediction or Long-Term Prediction (LTP), is achieved by limiting or reducing a pitch gain only for the first subframe or the first two subframes within a speech frame. The method is used for a speech class decided by a classification algorithm; the classification algorithm is designed, depending on at least one pitch cycle length compared to one subframe size. Speech coding quality loss due to the pitch gain reduction is compensated by increasing a coded excitation codebook size or adding one more stage of excitation only for the first subframe or the first two subframes within the speech frame.

REFERENCES:
patent: 6556966 (2003-04-01), Gao
patent: 6714907 (2004-03-01), Gao
patent: 7117146 (2006-10-01), Gao

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