A method and device for designing and searching large...

G - Physics – 10 – L

Patent

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

Patent

CA 2259094

A codebook is designed and searched in view of encoding a sound signal. This codebook consists of a set of codevectors each of dimension N, with a memory-efficient structure whereby a huge stochastic codebook is built from a collection of a small set of random vectors. The codebook is designed such that each codevector is obtained by the addition of several signed vectors from a small collection (for example 64) of random (e.g. Gaussian) vectors. For example a codebook which consists of the addition of two signed vectors from a collection of 64 Gaussian vectors gives rise to a 13-bit (8192-entry) codebook (6 bits for each of the two vector and 1 bit for the signs). Similarly, adding 3 vectors from a collection of 64 vectors gives rise to a 19-bit codebook. Besides the memory efficient structure of the codebook, a fast search procedure is used whereby only a small subset of the codebook is searched. In this fast search procedure, a small number of vectors from the collection of random vectors are predetermined, and the search is confined to the subset of codebook consisting of these pre-determined vectors.

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