Patent ID: 11955131
Assignee: FRAUNHOFER GESELLSCHAFT ZUR FÖRDERUNG DER ANGEWANDTEN FORSCHUNG E.V.
Field: Computer technology (Electrical engineering)
Classification: CPC G  H | IPC G  H

Claim 23:
24. Audio encoding method for encoding a multi-channel audio signal comprising at least three channels, comprising:
Calculating, in a first iteration step, inter-channel correlation values between each pair of the at least three channels, selecting, in the first iteration step, a pair comprising a highest value or comprising a value above a threshold, and processing the selected pair using a multichannel processing operation to derive first multichannel parameters for the selected pair and to derive first processed channels,
Performing the calculating, the selecting and the processing in a second iteration step using at least one of the processed channels to derive second multichannel parameters and second processed channels;
Encoding channels resulting from an iteration processing performed by the iteration processor to acquire encoded channels; and
generating an encoded multi-channel audio signal comprising the encoded channels and the first and the second multichannel parameters,
deriving, for a first frame, a plurality of selected pair indications, and including, into the multi-channel signal, for a second frame, following the first frame, a keep indicator, indicating that the second frame has the same plurality of selected pair indications as the first frame.