Amelioration de systemes de codage de source par une transposition d'adaptation

Enhancing source coding systems by adaptive transposition

Abstract

L'invention concerne un nouveau procédé permettant d'améliorer des systèmes de codage de source par reconstitution haute fréquence. De l'invention, on tire l'enseignement que des signaux de tonalités peuvent être classifiés soit par type ou non de trains d'impulsions. Cette classification permet d'obtenir de nettes améliorations de la qualité audio perçue par commutation adaptative de réémetteurs. L'invention montre que les réémetteurs ainsi commutés doivent avoir des différences fondamentales dans leurs caractéristiques.
The present invention relates to a new method for enhancement of source coding systems using high-frequency reconstruction. The invention teaches that tonal signals can be classified as either pulse-train-like or non-pulse-train-like. Relying on this classification, significant improvements on the perceived audio quality can be obtained by adaptive switching of transposers. The invention shows that the so-switched transposers must have fundamental differences in their characteristics.

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