Speech coding method using synthesis analysis

G - Physics – 10 – L

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G10L 19/10 (2006.01) G10L 19/08 (2006.01) G10L 11/06 (2006.01) G10L 19/00 (2006.01)

Patent

CA 2209623

A speech signal linear prediction analysis is performed for each frame of a speech signal to determine the coefficients of a short-term synthesis filter, and an open-loop analysis is performed to determine a degree of frame voicing. At least one closed-loop analysis is performed for each sub-frame to determine an excitation sequence which, when applied to the short-term synthesis filter, generates a synthetic signal representative of the speech signal. Each closed- loop analysis uses the impulse response of a filter consisting of the short- term synthesis filter and a perceptual weighting filter, by truncating said impulse response to a truncation length that is no greater than the number of samples per sub-frame, and dependent on the energy distribution of said response and the degree of voicing of the frame.

On effectue, pour chaque trame de signal de parole, une analyse par prédiction linéaire du signal de parole pour déterminer les coefficients d'un filtre de synthèse à court terme, et une analyse en boucle ouverte pour déterminer un degré de voisement de la trame. On effectue pour chaque sous-trame au moins une analyse en boucle fermée pour déterminer une séquence d'excitation qui, soumise au filtre de synthèse à court terme, produit un signal synthétique représentatif du signal de parole. Chaque analyse en boucle fermée utilise la réponse impulsionnelle d'un filtre composé du filtre de synthèse à court terme et d'un filtre de pondération perceptuelle, en tronquant ladite réponse impulsionnelle à une longueur de troncature au plus égale au nombre d'échantillons par sous-trame et dépendant de la distribution énergétique de ladite réponse et du degré de voisement de la trame.

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