G - Physics – 10 – L
Patent
G - Physics
10
L
G10L 19/12 (2006.01) G10L 19/00 (2006.01)
Patent
CA 2182386
A method using the algebraic index CELP coding technique. The search for CELP excitation comprises calculating certain components of covariance matrix U = H<T>.H where H is a lower triangular Toeplitz matrix formed from the impulse response of a filter consisting of synthesis filters and a perceptual weighting filter. The stored covariance matrix components are only those of pattern U(posi,p,posi,p) and those of pattern U(posi,p,posj,q), where posi,p and posj,q are the i position and the j position respectively for pulses p and q in the algebraic index codes.
Le procédé utilise la technique de codage CELP à répertoire algébrique. La recherche de l'excitation CELP comporte un calcul de certaines composantes de la matrice de covariance U = H T.H où H désigne une matrice triangulaire inférieure de Toeplitz formée à partir de la réponse impulsionnelle d'un filtre composé de filtres de synthèse et d'un filtre de pondération perceptuelle. Les composantes mémorisées de la matrice de covariance sont seulement celles de la forme U(pos i,p, pos i,p) et celles de la forme U(pos i,p, pos i~j,q,) pos i,p et pos j,q désignant respectivement la position i et la position j pour les impulsions p et q dans les codes du répertoire algébrique.
France Telecom
Norton Rose Or S.e.n.c.r.l. S.r.l./llp
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