Patent ID: 8553895

Claim:
A device for generating an encoded stereo signal of an audio piece or an audio datastream comprising a first stereo channel and a second stereo channel from a multi-channel representation of the audio piece or the audio datastream comprising information on more than two multi-channels, comprising: a provider configured to provide the more than two multi-channels from the multi-channel representation; a performer configured to perform headphone signal processing to generate an uncoded stereo signal with an uncoded first stereo channel and an uncoded second stereo channel, the performer being configured to: evaluate each multi-channel by a first filter function derived from a virtual position of a loudspeaker for reproducing the multi-channel and a virtual first ear position of a listener, for the first stereo channel, and a second filter function derived from a virtual position of the loudspeaker and a virtual second ear position of the listener, for the second stereo channel, to generate a first evaluated channel and a second evaluated channel for each multi-channel, the two virtual ear positions of the listener being different, add the evaluated first channels to obtain the uncoded first stereo channel, and add the evaluated second channels to obtain the uncoded second stereo channel; and a stereo encoder configured to encode the uncoded first stereo channel and the uncoded second stereo channel to obtain the encoded stereo signal, the stereo encoder being formed such that a data rate necessary for transmitting the encoded stereo signal is smaller than a data rate necessary for transmitting the uncoded stereo signal; wherein the multi-channel representation comprises one or several basic channels as well as parametric information for calculating each multi-channel from the one or several basic channels; the provider is configured to calculate each multi-channel from the one or the several basic channels and the parametric information; the provider is configured to provide, on an output side of the provider, a block-wise frequency domain representation for each multi-channel; the performer is configured to evaluate the block-wise frequency domain representation for each multi-channel by a frequency domain representation of the first and second filter functions without a frequency domain to time domain conversion; the performer is configured to generate a block-wise frequency domain representation of the uncoded first stereo channel and the uncoded second stereo channel; and the stereo encoder is a transformation-based encoder and is configured to process the block-wise frequency domain representation of the uncoded first stereo channel and the uncoded second stereo channel without a frequency domain to time domain conversion.