Patent ID: 8331572

Claim:
Decoding apparatus for decoding an encoded digital audio signal comprising at least a first and a second digital audio signal component, which have been encoded into a composite digital signal (X), wherein the composite digital signal is a wideband signal split into a plurality of composite digital subsignals, one for each of a plurality of frequency bands, the parameter signal also being split into a plurality of parameter sub signals, one for each of the plurality of frequency bands, and a parameter signal (P), the decoding apparatus comprising: an input unit ( 210 ) for receiving a transmission signal, a demultiplexer unit ( 210 ) for retrieving the composite digital signal and the parameter signal from the transmission signal, a decorrelator unit ( 401 ) for generating from the composite digital signal a decorrelated version of the composite digital signal and to generate from the composite digital sub signals a decorrelated version of the composite digital sub signals, a matrixing unit ( 403 ) for receiving the composite digital signal and the decorrelated version of the composite digital signal and generating there from a reproduction of the first and second digital audio signal component and to receive the composite digital sub signals and the decorrelated version of the composite digital sub signals and generating there from a reproduction of a plurality of sub signals for each of the first and second digital audio signal components, the reproduction of the first digital audio signal component being a linear combination of the composite digital signal and the decorrelated version of the composite digital signal, using multiplier coefficients that are dependent of the parameter signal, the reproduction of the second digital audio signal component being a linear combination of the composite digital signal and the decorrelated version of the composite digital signal, using multiplier coefficients that are dependent of the parameter signal, wherein a sub signal of the first digital audio signal component being a linear combination of a corresponding composite digital sub signal and the decorrelated version of the corresponding composite digital sub signal, using multiplier coefficients that are dependent of a corresponding one of said parameter sub signals, and a sub signal of the second digital audio signal component being a linear combination of a corresponding composite digital sub signal and the decorrelated version of the corresponding composite digital sub signal, using multiplier coefficients that are dependent of a corresponding one of said parameter sub signals, and a transform unit ( 307 ) to transform the sub signals of the first and second digital audio signal components into said reproductions of said first and second digital audio signal components.