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

US11488610B2 · kind B2 · utility

Assignee

• Fraunhofer-Gesellschaft zur förderung der angewandten Forschung e.V. · DE

Inventors

• Sascha Dick · Nuremberg, DE
• Christian Ertel · Eckental, DE
• Christian Helmrich · Erlangen, DE
• Johannes Hilpert · Nuremberg, DE
• Andreas Hoelzer · Erlangen, DE
• Achim Kuntz · Hemhofen, DE

Key dates

• Filing date: Sep 3, 2020
• Grant date: Nov 1, 2022
• Expiry date: Sep 3, 2040

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04S2420/03
• WIPO field: Computer technology
• WIPO sector: Electrical engineering

Abstract

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