Patent ID: 7391870
Filing Date: 2008-06-24
Classification: G10L,H04S

Abstract:
1. Apparatus for generating a multi-channel output signal having K output channels, the multi-channel output signal corresponding to a multi-channel input signal having C input channels, using E transmission channels, the E transmission channels representing a result of a downmix operation having C input channels as an input, and using parametric information related to the input channels, wherein E is ≧2, C is >E, and K is >1 and ≦C, and wherein the downmix operation is effective to introduce a first input channel in a first transmission channel and in a second transmission channel, and to additionally introduce a second input channel in the first transmission channel, comprising: a cancellation channel calculator for calculating a cancellation channel using information related to the first input channel included in the first transmission channel, the second transmission channel or the parametric information; a combiner for combining the cancellation channel and the first transmission channel or a processed version thereof to obtain a second base channel, in which an influence of the first input channel is reduced compared to the influence of the first input channel on the first transmission channel; and a channel reconstructor for reconstructing a second output channel corresponding to the second input channel using the second base channel and parametric information related to the second input channel, and for reconstructing a first output channel corresponding to the first input channel using a first base channel being different from the second base channel in that the influence of the first channel is higher compared to the second base channel, and parametric information related to the first input channel.