Speech pitch coding system

Details Speech pitch coding system Speech pitch coding system

G - Physics

10

L

G10L 11/04 (2006.01) G10L 19/12 (2006.01) G10L 19/00 (2006.01)

Patent

CA 2130877

A plurality of pitch period transition paths are extracted by pitch tracking over a frame, and a path of minimum average prediction gain over the frame is selected from the extracted paths. A subsequent preliminary pitch selection may be executed in a sub-frame processing to select a plurality of candidates from the neighbourhood of the pitch of the transition path selected for each sub-frame. The selection uses the inner product of the input speech signal and codebook codevectors. Finally, a pitch period having a minimum waveform distortion is selected for each sub-frame.

Plusieurs parcours de transition d'un ton sont obtenus en mesurant le ton sur un certain intervalle, d'où on peut extraire une prédiction pour le gain minimal moyen de cet intervalle. Subséquemment, on peut choisir un ton de façon préliminaire lors de l'analyse d'un sous-intervalle, de façon à obtenir plusieurs choix possibles situés au voisinage du ton correspondant au parcours choisi pour ce sous-intervalle. Le choix s'effectue en effectuant le produit scalaire du signal sonore initial et de vecteurs d'un répertoire de codage. Finalement, on sélectionne un ton pour chaque sous-intervalle ayant pour résultat de minimiser la distorsion de l'impulsion d'onde.

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