Device and method for processing a multi-channel signal

G - Physics – 10 – L

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G10L 19/00 (2006.01) G10L 19/02 (2006.01)

Patent

CA 2558161

An apparatus for processing a multi-channel signal includes a means (12) for determining a similarity between a first one of two channels and a second one of the two channels. Furthermore, a means (16) for performing a prediction filtering of the spectral coefficients is provided, which is formed to perform a prediction filtering with only a single prediction filter (16a) for both channels in case of high similarity between the first and the second channel, and to perform a prediction filtering with two separate prediction filters (16b) in case of a dissimilarity between the first and the second channel. With this, an introduction of stereo artifacts and a deterioration of the coding gain in stereo coding techniques are avoided.

L'invention concerne un dispositif pour traiter un signal muticanal, comprenant une unité (12) pour déterminer une analogie entre un premier canal et un deuxième canal parmi deux canaux. Le dispositif selon l'invention comporte également une unité (16) servant à effectuer un filtrage prédictif des coefficients spectraux, cette unité étant configurée pour effectuer un filtrage prédictif à l'aide d'un filtre prédictif unique (16a) pour les deux canaux, en cas d'analogie élevée entre le premier et le deuxième canal, ainsi que pour effectuer un filtrage prédictif au moyen de deux filtres prédictifs distincts (16b) en cas de dissimilitude entre le premier et le deuxième canal, ce qui empêche l'introduction d'artefacts stéréo et une dégradation du gain de codage lors de l'application de techniques de codage stéréo.

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