Apparatus and method for generating a multi-channel output...

G - Physics – 10 – L

Patent

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G10L 19/00 (2006.01)

Patent

CA 2572989

An apparatus for generating a multi-channel output signal performs a center channel cancellation to obtain improved base channels for reconstructing left- side output channels or right-side output channels. In particular, the apparatus includes a cancellation channel calculator (20) for calculating a cancellation channel using information related to the original center channel available at the decoder. The device furthermore includes a combiner (22) for combining a transmission channel with the cancellation channel. Finally, the apparatus includes a reconstructor (26) for generating the multi-channel output signal. Due to the center channel cancellation, the channel reconstructor (26) not only uses a different base channel for reconstructing the center channel but also uses base channels different from the transmission channels for reconstructing left and right output channels which have a reduced or even completely cancelled influence of the original center channel.

Selon l'invention, un appareil pour générer un signal de sortie multicanal effectue une suppression de canal central pour obtenir des canaux de base améliorés afin de reconstruire des canaux de sortie du côté gauche ou des canaux de sortie du côté droit. L'appareil comprend notamment un calculateur de canaux de suppression (20) destiné à calculer un canal de suppression en utilisant des informations en rapport avec le canal central initial disponible dans le décodeur. Le dispositif comprend également un combineur (22) destiné à combiner un canal de transmission avec le canal de suppression. Enfin, l'appareil comprend un reconstructeur (26) destiné à générer le signal de sortie multicanal. Grâce à la suppression du canal central, le reconstructeur de canaux (26) utilise non seulement un canal de base différent pour reconstruire le canal central mais utilise aussi les canaux de base différents des canaux de transmission pour reconstruire les canaux de sortie gauche et droite qui ont une influence réduite, voire totalement supprimée, du canal central initial.

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