Audio decoder, audio encoder, method for providing at least four audio channel signals on the basis of an encoded representation, method for providing an encoded representation on the basis of at least four audio channel signals and computer program using a bandwidth extension

摘要

An audio decoder for providing at least four bandwidth-extended channel signals on the basis of an encoded representation is configured to provide a first downmix signal and a second downmix signal on the basis of a jointly encoded representation of the first downmix signal and the second downmix signal using a multi-channel decoding. The audio decoder is configured to provide at least a first (third) audio channel signal and a second (fourth) audio channel signal on the basis of the first (second) downmix signal using a multi-channel decoding. The audio decoder is configured to perform a multi-channel bandwidth extension on the basis of the first (second) audio channel signal and the third (fourth) audio channel signal, to obtain a first (second) bandwidth-extended channel signal and a third (fourth) bandwidth-extended channel signal. An audio encoder uses a related concept.