Method and device for transcoding audio signals

G - Physics – 10 – L

Patent

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G10L 19/14 (2006.01) G10L 19/02 (2006.01)

Patent

CA 2662910

The present invention provides method and device for transcoding between audio coding formats with different time-frequency analysis domains, as used for example by MPEG-AAC and mp3, particularly for facilitated and faster transcoding between such audio signals. A method for transcoding a framed audio signal from a first parameter domain (PDA) into a second parameter domain (PDB) comprises linearly transforming (TT) two or more parameters of the first parameter domain (PDA) to at least one parameter of the second parameter domain (PDB), wherein the two or more parameters of the first parameter domain come from different frames of the audio signal in the first parameter domain. The linear transformation (TT) can be described as a matrix and implemented as a look-up table.

La présente invention concerne un procédé et un dispositif permettant un transcodage entre des formats de codage audio avec différents domaines de l'analyse temps - fréquence, tels qu'utilisés par exemple par les formats MPEG-ACC et MP3, en particulier pour faciliter et accélérer le transcodage entre de tels signaux audio. Un procédé permettant de transcoder un signal audio tramé provenant d'un premier domaine de paramètres (PDA) dans un second domaine de paramètres (PDB) comprend la transformation linéaire (TT) de deux paramètres ou plus du premier domaine de paramètres (PDA) en au moins un paramètre du second domaine de paramètres (PDB), les deux paramètres ou plus du premier domaine de paramètres provenant de différentes trames du signal audio dans le premier domaine de paramètres. La transformation linéaire (TT) peut être représentée comme une matrice et être implémentée comme une table de correspondance.

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