Apparatus and method for generating an ambient signal from...

G - Physics – 10 – L

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G10L 19/00 (2006.01) G10L 19/02 (2006.01) H04S 5/00 (2006.01) H04S 7/00 (2006.01)

Patent

CA 2664163

An apparatus for generating an ambient signal from an audio signal comprises means for lossy compression of a representation of the audio signal so as to obtain a compressed representation of the audio signal describing a compressed audio signal. The apparatus for generating the ambient signal further comprises means for calculating a difference between the compressed representation of the audio signal and the representation of the audio signal so as to obtain a discrimination representation. The apparatus further comprises means for providing the ambient signal using the discrimination representation. An apparatus for deriving a multi-channel audio signal from an audio signal comprises an apparatus for generating an ambient signal from an audio signal, an apparatus for providing the audio signal as a front-loudspeaker signal and an apparatus for providing the ambient signal as a back-loudspeaker signal.

La présente invention concerne un appareil pour générer un signal ambiant à partir d'un signal audio qui comprend un moyen pour la compression avec perte d'une représentation du signal audio de manière à obtenir une représentation compressée du signal audio décrivant un signal audio compressé. L'appareil pour générer le signal ambiant comprend également un moyen pour calculer une différence entre la représentation compressée du signal audio et la représentation du signal audio, de manière à obtenir une représentation de discrimination. L'appareil comprend également un moyen pour fournir le signal ambiant à l'aide de la représentation de discrimination. Un appareil pour dériver un signal audio multicanal d'un signal audio, comprend un appareil pour générer un signal ambiant à partir d'un signal audio, un appareil pour fournir le signal audio comme signal de haut-parleur avant et un appareil pour fournir le signal ambiant sous forme de signal de haut-parleur arrière.

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