G - Physics – 10 – L
Patent
G - Physics
10
L
G10L 11/04 (2006.01) H04Q 7/22 (2006.01)
Patent
CA 2347743
An improved pitch search method and device for digitally encoding a wideband signal, in particular but not exclusively a speech signal, in view of transmitting, or storing, and synthesizing this wideband sound signal. The new method and device which achieve efficient modeling of the harmonic structure of the speech spectrum uses several forms of low pass filters applied to a pitch codevector, the one yielding higher prediction gain (i.e, the lowest pitch prediction error) is selected and the associated pitch codebook parameters are forwarded.
L'invention concerne un procédé amélioré de recherche de hauteur et un dispositif de codage numérique d'un signal à large bande, en particulier mais pas exclusivement un signal vocal, en vue de transmettre ou de stocker, et de synthétiser ce signal sonore à large bande. Le procédé et le dispositif nouveaux, lesquels permettent une modélisation efficace de la structure harmonique du spectre de la parole, utilisent plusieurs formes de filtres passe-bas appliqués à un vecteur de code de hauteur, celui permettant d'obtenir le gain de prédiction le plus haut (c'est-à-dire l'erreur de prédiction de hauteur la plus faible) est sélectionné et les paramètres de code de hauteur associés sont retransmis.
Bessette Bruno
Lefebvre Roch
Salami Redwan
Bkp Gp
Voiceage Corporation
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