Multirate speech codecs

Details Multirate speech codecs Multirate speech codecs

2005-09-06

2005-09-06

Tran, Sinh (Department: 2644)

Telephonic communications

Substation or terminal circuitry

C704S227000, C704S229000, C379S387020

Reexamination Certificate

active

06940967

ABSTRACT:
A method of determining a codec mode for encoding a frame in a communications system, the method comprising the steps of: receiving a sequence of signal samples arranged in frames; analysing a current frame to select a codec mode appropriate for the current frame; predicting the characteristics of a subsequent frame using lookahead samples from the subsequent frame; and determining a codec mode for the current frame and the subsequent frame which suits the current frame and also suits a subsequent frame based on the predicted characteristics.

REFERENCES:
patent: 6647366 (2003-11-01), Wang et al.
patent: 2003/0135372 (2003-07-01), Zinser et al.
patent: 2004/0002856 (2004-01-01), Bhaskar et al.
patent: 2005/0055203 (2005-03-01), Makinen et al.

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