G - Physics – 10 – L
Patent
G - Physics
10
L
G10L 19/12 (2006.01) G10L 19/00 (2006.01)
Patent
CA 2010830
A method of encoding a speech signal is disclosed. This method improves the excitation codebook and search procedure of the conventional Code Excited Linear Prediction (CELP) speech encoders. Use is made of a dynamic codebook based on a combination of two modules: a sparse algebraic code generator associated to a filter having a transfer function varying in time. The generator is a structured codebook with codewords having very few non zero components. The filter shapes the spectral characteristics whereby the resulting excitation codebook exhibits favorable perceptual properties. The search complexity in finding the best codeword is greatly reduced by bringing the search back to the algebraic code domain thereby allowing the sparcity of the algebraic code to speed up the necessary computations.
Adoul Jean-Pierre
Laflamme Claude
Bkp Gp
Universite de Sherbrooke
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