Multi-channel audio decoder, multi-channel audio encoder, methods and computer program using a residual-signal-based adjustment of a contribution of a decorrelated signal

US10839812B2 · kind B2 · utility

Assignee

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

Inventors

• Sascha Dick · Nuremberg, DE
• Christian Helmrich · Erlangen, DE
• Johannes Hilpert · Nuremberg, DE
• Andreas Hoelzer · Erlangen, DE

Key dates

• Filing date: Jan 22, 2016
• Grant date: Nov 17, 2020
• Expiry date: Jan 22, 2036

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04S2420/07
• WIPO field: Computer technology
• WIPO sector: Electrical engineering

Abstract

A multi-channel audio decoder for providing at least two output audio signals on the basis of an encoded representation is configured to perform a weighted combination of a downmix signal, a decorrelated signal and a residual signal, to obtain one of the output audio signals. The multi-channel audio decoder is configured to determine a weight describing a contribution of the decorrelated signal in the weighted combination in dependence on the residual signal. A multi-channel audio encoder for providing an encoded representation of a multi-channel audio signal is configured to obtain a downmix signal on the basis of the multi-channel audio signal, to provide parameters describing dependencies between the channels of the multi-channel audio signal, and to provide a residual signal. The multi-channel audio encoder is configured to vary an amount of residual signal included into the encoded representation in dependence on the multi-channel audio signal.