Improved audio coding systems and methods using spectral...

Details Improved audio coding systems and methods using spectral... Improved audio coding systems and methods using spectral...

G - Physics

10

L

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

Patent

CA 2521601

An audio encoder discards spectral components of an input signal and uses channel coupling to reduce the information capacity requirements of an encoded signal. Channel coupling represents selected spectral components of multiple channels of signals in a composite form. An audio decoder synthesizes spectral components to replace the discarded spectral components and generates spectral components for individual channel signals from the coupled-channel signal. The encoder provides scale factors in the encoded signal that improve the efficiency of the decoder to generate output signals that substantially preserve the spectral energy of the original input signals.

L'invention concerne un codeur audio supprimant des composants spectraux d'un signal d'entrée et utilisant un couplage de canaux pour réduire les exigences de capacité d'informations d'un signal codé. Le couplage de canaux représente des composants spectraux sélectionnés de nombreux canaux de signaux sous une forme composite. Un décodeur audio synthétise des composants spectraux pour remplacer les composants spectraux supprimés et produit des composants spectraux pour des signaux de canaux individuels à partir du signal de canaux couplés. Le codeur produit des facteurs d'échelle dans le signal codé, ce qui améliore l'efficacité du décodeur pour produire des signaux de sortie, lesquels préservent sensiblement l'énergie spectrale des signaux d'entrée d'origine.

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