Lpc vector quantization apparatus

G - Physics – 10 – L

Patent

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Details

G10L 19/04 (2006.01) G10L 19/06 (2006.01) G10L 19/12 (2006.01) H03M 7/30 (2006.01) G10L 19/00 (2006.01)

Patent

CA 2429832

The present invention carries out pre-selection on many LPC codevectors stored in an LSF codebook 101 using a weighted Euclidean distortion as a measure and carries out a full-code selection on the LPC codevectors left after the pre-selection using an amount of distortion in a spectral space as a measure. This makes it possible to improve the quantization performance of the LPC parameter vector quantizer and improve the quality of synthesized speech of the speech coder/decoder.

L'invention concerne des vecteurs de code LPC préalablement sélectionnés parmi plusieurs vecteurs de code LOPC et stockés dans un dictionnaire du chiffre LSF (101), une distance d'Euclide de pondération étant utilisée comme mesure. Après cette sélection préliminaire, les vecteurs de code LPC restants font l'objet d'une sélection finale de codes, une valeur de distorsion dans la largeur de spectre étant utilisé comme mesure. On augmente ainsi le rendement de quantification d'un dispositif de quantification vectorielle pour des paramètres LPC, ce qui améliore la qualité de la parole synthétisée dans un dispositif de codage-décodage de la parole.

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