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 0:
1. Audio encoder for encoding an multi-channel audio signal comprising at least three channels, comprising:
an iteration processor for calculating, in a first iteration step, inter-channel correlation values between each pair of the at least three channels, for selecting, in the first iteration step, a pair comprising a highest value or comprising a value above a threshold, and for processing the selected pair using a multichannel processing operation to derive first multichannel parameters for the selected pair and to derive first processed channels,
wherein the iteration processor is configured to perform 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;
a channel encoder for encoding channels resulting from an iteration processing performed by the iteration processor to acquire encoded channels; and
an output interface for generating an encoded multi-channel audio signal comprising the encoded channels and the first and the second multichannel parameters,
wherein the iteration processor is configured to derive, for a first frame, a plurality of selected pair indications, and wherein the output interface is configured to comprise, into the multi-channel audio signal, for a second frame, following the first frame, a keep indicator, indicating that the second frame comprises the same plurality of selected pair indications as the first frame.