Algebraic code excited linear prediction speech coding method

摘要

PCT No. PCT/FR96/00017 Sec. 371 Date Aug. 26, 1996 Sec. 102(e) Date Aug. 26, 1996 PCT Filed Jan. 4, 1996 PCT Pub. No. WO96/21221 PCT Pub. Date Jul. 11, 1996The method uses the technique of CELP coding with algebraic codebook. The search for the CELP excitation includes a calculation of certain components of the covariance matrix U=HTxH where H denotes a lower triangular Toeplitz matrix formed on the basis of the impulse response of a compound filter made up of synthesis filters and of a perceptual weighting filter. The memory-stored components of the covariance matrix are only those of the form U(posi,p,posi,p) and those of the form U(posi,p, posj,q), posi,p and posj,q respectively denoting position i and position j for the pulses p and q in the codes of the algebraic codebook.