Audio encoder and audio decoder

G - Physics – 10 – L

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G10L 19/02 (2006.01)

Patent

CA 2729925

An audio encoder (100) for en-coding segments of coefficients, the segments of coefficients representing different time or frequency resolutions of a sampled audio sig-nal, the audio encoder (100) comprising a pro-cessor (110) for deriving a coding context for a currently encoded coefficient of a current seg-ment based on a previously encoded coeffi-cient of a previous segment, the previously en-coded coefficient representing a different time or frequency resolution than the currently en-coded coefficient. The audio encoder (100) further comprises an entropy encoder (120) for entropy encoding the current coefficient based on the coding context to obtain an encoded au-dio stream.

Linvention concerne un encodeur audio (100) pour encoder des segments de coefficients, les segments de coefficients représentant différentes résolutions temporelles ou fréquentielles d'un signal audio échantillonné, l'encodeur audio (100) comprenant un processeur (110) pour déduire un contexte de codage pour un coefficient actuellement encodé d'un segment actuel sur la base d'un coefficient précédemment encodé d'un segment précédent, le coefficient précédemment encodé représentant une résolution temporelle ou fréquentielle différente de celle du coefficient actuellement encodé. L'encodeur audio (100) comprend en outre un encodeur d'entropie (120) pour encoder l'entropie du coefficient actuel sur la base du contexte de codage pour obtenir un flux audio encodé.

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