G - Physics – 10 – L
Patent
G - Physics
10
L
354/47
G10L 19/10 (2006.01) G10L 19/00 (2006.01)
Patent
CA 1338387
A vector excitation coder efficiently com- presses vectors by using an optimum codebook designed off line, using an initial arbitrary codebook and a set of speech training vectors exploiting codevector sparsity (i.e., by making zero all but a selected number of samples of lowest amplitude in each of N codebook vectors). A fast-search method selects a number Nc of good excitation vectors from the code- book, where Nc is much smaller than N, and uses only the Nc vectors in an exhaustive search for the best match between a perceptually weighted input vector Zn~ and an estimate Zn derived from a codebook vector processed through long-term and short-terms filters, and a perceptual weighting filter. The zero input response of these cascaded filters is calculated and subtracted from an input speech vector sn after per- ceptual weighting to produce a vector rn. The code- book search operation is performed using Image , by calculating the numerator of a fast inner product and calculating the denominator by a fast inner prod- uct for each codebook vector cj, computing the right hand side of the equation once per frame, and then cross multiplying the numerators and denominators to determine if N2/D2 is less than N1/D1 by determining if N1D2>N2D1. If not N2 and D2 replace N1 and D1 in registers En and Ed.
563230
Davidson Grant
Gersho Allen
Btg Usa Inc.
Smart & Biggar
LandOfFree
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