Adaptive hybrid transform for signal analysis and synthesis

G - Physics – 10 – L

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G10L 19/02 (2006.01) G06T 9/00 (2006.01) H04N 7/30 (2006.01)

Patent

CA 2554381

Analysis and synthesis filter banks such as those used in audio and video coding systems are each implemented by a hybrid transform that comprises a primary transform in cascade with one or more secondary transforms. The primary transforms for the filter banks implement an analysis/synthesis system in which time-domain aliasing artifacts are cancelled. The secondary transforms, which are in cascade with the primary transforms, are applied to blocks of transform coefficients. The length of the blocks is varied to adapt the time resolution of the analysis and synthesis filter banks.

L'analyse et la synthèse de bancs de filtres tels que ceux utilisés dans des systèmes de codage audio et vidéo sont chacune mise en oeuvre par une transformée hybride qui comporte une transformée primaire en cascade avec une ou des transformées secondaires. La transformée primaire pour les bancs de filtres utilise un système d'analyse/synthèse dans lequel les artéfacts de repliement de domaine temporel sont annulés. Les transformées secondaires, qui sont en cascade avec la transformée primaire, sont appliquées à des blocs de coefficients de transformée. La longueur des blocs est variée pour l'adaptation de la résolution temporelle des bancs de filtres d'analyse et de synthèse.

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