Patent ID: 8270618
Filing Date: 2012-09-18
Classification: G10L,H04S

Abstract:
1. Apparatus for processing a multi-channel audio signal, the multi-channel audio signal having at least three original channels, comprising: a provider for providing a first downmix channel and a second downmix channel, the first and the second downmix channels being derived from the original channels; a calculator for calculating channel side information for a selected original channel of the original signals, the calculator being operative to calculate the channel side information such that a downmix channel or a combined downmix channel comprising the first and the second downmix channel, when weighted using the channel side information, results in an approximation of the selected original channel; a generator for generating output data, the output data comprising the channel side information; wherein at least one of the provider, the calculator or the generator comprises a hardware implementation; wherein the multi-channel audio signal includes a left channel, a left surround channel, a right channel and a right surround channel, wherein the provider is operative to provide the first downmix channel as a left downmix channel and to provide the second downmix channel as a right downmix channel, the left and the right downmix channels being formed such that a result, when played, is a stereo representation of the multi-channel audio signal, and wherein the calculator is operative: