AN APPARATUS AND A METHOD FOR RECONSTRUCTING A MULTI-CHANNEL SIGNAL USING AT LEAST ONE BASE CHANNEL AND A PARAMETRIC REPRESENTATION

摘要

The invention relates to an apparatus for reconstructing a multi-channel signal using at least one base channel and a parametric representation comprising direction parameter information indicating a direction from a reference position in a replay setup to a region in the replay setup, wherein a combined sound energy of at least three original channels is concentrated, from which the at least one base channel has been derived, and comprising a balance parameter, the apparatus comprising: an output channel generator for generating a number of output channels to be positioned in the replay setup with respect to the reference position, the number of output channels being higher than the number of base channels, wherein the output channel generator is configured to generate the output channels in response to the direction parameter information so that the direction from the reference position to the region, wherein the combined energy of the reconstructed output channels is concentrated depends on the direction indicated by the direction parameter information, wherein the output channel generator is configured to select a pair of output channels using the direction parameter to obtain a selected pair of output channels, the direction parameter comprising information on a pair of output channels as a direction from a reference position in a replay setup to a region in the replay setup, wherein a combined sound energy of at least three original channels is concentrated, wherein the output channel generator is configured to calculate audio signals for the selected pair of output channels using the balance parameter indicating a balance between the selected pair of output channels such that an energy distribution between the selected pair of output channels is determined by the balance parameter, and wherein the output channel generator is configured to calculate one or more ambience channel signals for one or more channels not included in the selected pair of output channels, wherein the output channel generator comprises a hardware implementation.