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

A multi-channel audio decoder for providing at least two output audio signals on the basis of an encoded representation,

• wherein the multi-channel audio decoder is configured to acquire one of the at least two output audio signals on the basis of a downmix signal, a decorrelated signal and a residual signal using a weighted combination of the downmix signal, the decorrelated signal and the residual signal,
• wherein the downmix signal, the decorrelated signal and the residual signal are determined by the multi-channel audio decoder on the basis of the encoded representation;
• wherein the multi-channel audio decoder is configured to determine a weighting of the decorrelated signal in the weighted combination in dependence on the residual signal and in dependence on the decorrelated signal,
• wherein the multi-channel audio decoder is configured to put a comparatively higher weight on the decorrelated signal if the residual signal is comparatively weak, and to put a comparatively smaller weight on the decorrelated signal if the residual signal is comparatively strong;
• and
• wherein the multi-channel audio decoder is configured to variably adjust a weighting of the residual signal in the weighted combination in dependence on the decorrelated signal.

A method for providing at least two output audio signals on the basis of an encoded representation, the method comprising:

• obtaining a downmix signal, a decorrelated signal and a residual signal on the basis of the encoded representation;
• acquiring one of the at least two output audio signals on the basis of the downmix signal, the decorrelated signal and the residual signal using a weighted combination of the downmix signal, the decorrelated signal and the residual signal,
• determining a weighting of the decorrelated signal in the weighted combination in dependence on the residual signal and in dependence on the decorrelated signal,
• putting a comparatively higher weight on the decorrelated signal if the residual signal is comparatively weak, and putting a comparatively smaller weight on the decorrelated signal if the residual signal is comparatively strong;
• and
• wherein a weight of the residual signal in the weighted combination is variably adjusted in dependence on the downmix signal.

A method for providing at least two output audio signals on the basis of an encoded representation, the method comprising:

• obtaining a downmix signal, a decorrelated signal and a residual signal on the basis of the encoded representation;
• acquiring one of the at least two output audio signals on the basis of the downmix signal, the decorrelated signal and the residual signal using a weighted combination of the downmix signal, the decorrelated signal and the residual signal,
• determining a weighting of the decorrelated signal in the weighted combination in dependence on the residual signal and in dependence on the decorrelated signal,
• putting a comparatively higher weight on the decorrelated signal if the residual signal is comparatively weak, and putting a comparatively smaller weight on the decorrelated signal if the residual signal is comparatively strong;
• and
• wherein a weight of the residual signal in the weighted combination is variably adjusted in dependence on the decorrelated signal.