APPARATUS AND METHOD FOR GENERATING AN AMBIENT SIGNAL FROM AN AUDIO SIGNAL, APPARATUS AND METHOD FOR DERIVING A MULTI-CHANNEL AUDIO SIGNAL FROM AN AUDIO SIGNAL AND COMPUTER PROGRAM

摘要

An apparatus for generating an ambient signal from an audio signal compri ses means for lossy compression of a representation of the audio signal so a s to obtain a compressed representation of the audio signal describing a com pressed audio signal. The apparatus for generating the ambient signal furthe r comprises means for calculating a difference between the compressed repres entation of the audio signal and the representation of the audio signal so a s to obtain a discrimination representation. The apparatus further comprises means for providing the ambient signal using the discrimination representat ion. An apparatus for deriving a multi-channel audio signal from an audio si gnal comprises an apparatus for generating an ambient signal from an audio s ignal, an apparatus for providing the audio signal as a front-loudspeaker si gnal and an apparatus for providing the ambient signal as a back-loudspeaker signal.