Method for the time scaling of an audio signal

G - Physics – 10 – L

Patent

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G10L 21/04 (2006.01) G10L 11/04 (2006.01) G10L 11/06 (2006.01) G10L 13/00 (2006.01)

Patent

CA 2650419

A method for the time scaling of a sampled audio signal is presented. The method includes a first step of performing a pitch and voicing analysis of each frame of the signal in order to determine if a given frame is voiced or unvoiced and to evaluate a pitch profile for voiced frames. The results of this analysis are used to determine the length and position of analysis windows along each frame. Once an analysis window is determined, it is overlap-added to previously synthesized windows of the output signal.

L'invention concerne un procédé permettant de normaliser temporellement un signal audio échantillonné. Le procédé comprend une première étape consistant à effectuer une analyse de hauteur et de verbalisation de chaque trame du signal afin de déterminer si une trame donnée est verbalisée ou non et d'évaluer un profil de hauteur pour les trames verbalisées. Les résultats de cette analyse sont utilisés pour déterminer la longueur et la position de fenêtre d'analyse pour chaque trame. Une fois qu'une fenêtre d'analyse est déterminée, elle est ajoutée par recouvrement à des fenêtres synthétisées antérieurement du signal de sortie.

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