Audio coding system using spectral hole filling

Details Audio coding system using spectral hole filling Audio coding system using spectral hole filling

G - Physics

10

L

G10L 19/02 (2006.01) G10L 21/02 (2006.01)

Patent

CA 2489441

Audio coding processes like quantization can cause spectral components of an encoded audio signal to be set to zero, creating spectral holes in the signal. These spectral holes can degrade the perceived quality of audio signals that are reproduced by audio coding systems. An improved decoder avoids or reduces the degradation by filling the spectral holes with synthesized spectral components. An improved encoder may also be used to realize further improvements in the decoder.

L'invention concerne des procédés de codage audio tels que la quantification, qui permettent de mettre à zéro les composantes spectrales d'un signal audio codé et de former ainsi des trous spectraux dans le signal. Ces trous spectraux peuvent dégrader la qualité perçue des signaux audio qui sont reproduits par des systèmes de codage audio. Un décodeur amélioré permet d'éviter une dégradation ou de réduire celle-ci par le remplissage des trous spectraux à l'aide de composantes spectrales synthétisées. Un codeur amélioré peut aussi être utilisé pour mettre en oeuvre d'autres améliorations dans le décodeur.

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