MULTI-CHANNEL DECORRELATOR, MULTI-CHANNEL AUDIO ENCODER, METHOD AND COMPUTER PROGRAM USING A PREMIX OF DECORRELATOR INPUT SIGNALS

摘要

A multi-channel decorrelator for providing a plurality of decorrelated signals on the basis of a plurality of decorrelator input signals is configured to premix a first set of N decorrelator input signals into a second set of K decorrelator input signals, wherein KN. The multi-channel decorrelator is configured to provide a first set of K' decorrelator output signals on the basis of the second set of K decorrelator input signals. The multi-channel decorrelator is further configured to upmix the first set of K' decorrelator output signals into a second set of N' decorrelator output signals, wherein N'K'. The multi-channel decorrelator can be used in a multi-channel audio decoder. A multi-channel audio encoder provides complexity control information for the multi-channel decorrelator.