Patent ID: 7394903

Claim:
Apparatus for constructing a multi-channel output signal using an input signal and parametric side information, the input signal including a first input channel and a second input channel derived from an original multi-channel signal, the original multi-channel signal having a plurality of channels, the plurality of channels including at least two original channels, which are defined as being located at one side of an assumed listener position, wherein a first original channel is a first one of the at least two original channels, and wherein a second original channel is a second one of the at least two original channels, and the parametric side information describing interrelations betweens original channels of the multi-channel original signal, comprising: means for determining a first base channel by selecting one of the first and the second input channels or a combination of the first and the second input channels, and for determining a second base channel by selecting the other of the first and the second input channels or a different combination of the first and the second input channels, such that the second base channel is different from the first base channel; and means for synthesizing a first output channel using the parametric side information and the first base channel to obtain a first synthesized output channel which is a reproduced version of the first original channel which is located at the one side of the assumed listener position, and for synthesizing a second output channel using the parametric side information and the second base channel, the second output channel being a reproduced version of the second original channel which is located at the same side of the assumed listener position.