Digital speech coder having improved vector excitation source

Details Digital speech coder having improved vector excitation source Digital speech coder having improved vector excitation source

G - Physics

10

L

354/120, 354/47

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

Patent

CA 1279404

CM00382H DIGITAL SPEECH CODER HAVING IMPROVED VECTOR EXCITATION SOURCE Abstract of the Disclosure An improved excitation vector generation and search technique (Fig. 1) is described for a code-excited linear prediction (CELP) speech coder (100) using a codebook of excitation code vectors. A set of M basic vectors vm(n) are used along with the excitation signal codewords (i) to generate the codebook of excitation vectors ui(n) according to a "vector sum" technique (120) of converting the selector codewords into a plurality of interim data signals, multiplying the set of M basis vectors by the interim data signals, and summing the resultant vectors to produce the set of 2M codebook vectors. The entire codebook of 2M possible excitation vectors is efficiently searched by using the vector sum generation technique with the M basic vectors -- without ever having to generate and evaluate each of the 2M code vectors themselves. Furthermore, only M basis vectors need to be stored in memory (114), as opposed to all 2M code vectors.

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