Koninklijke Philips Corporation N.V.

Fraunhofer-gesellschaft Zur Foerderung Der Angewandten Forschung E.v.

Coding Technologies Ab

Dolby International Ab

Dolby Sweden Ab

Jonas Röden

Heiko Purnhagen

Jonas Engdegard

Jürgen Herre

Jeroen Dirk Breebaart

Lars Villemoes

Johannes Hilpert

Lars Gustaf Liljeryd

Erik Schuijers

Kristofer Kjörling

Andreas Hölzer

Werner Oomen

Frederik Henn

Steven Van De Par

Parameters being a measure for a characteristic of a channel or of a pair of channels, wherein the parameter is a measure for a characteristic of the channel or of the pair of channels with respect to another channel of a multi-channel signal can be quantized more efficiently using a quantization rule that is generated based on a relation of an energy measure of the channel or the pair of channels and an energy measure of the multi-channel signal. With generation of the quantization rule taking into account a psycho acoustic approach, the size of an encoded representation of the multi-channel signal can be decreased by coarser quantization without significantly disturbing the perceptual quality of the multi-channel signal when reconstructed from the encoded representation.

Energy dependent quantization for efficient coding of spatial audio parameters

A parametric representation of a multi-channel audio signal describes the spatial properties of the audio signal well with compact side information when a coherence information, describing the coherence between a first and a second channel, is derived within a hierarchical encoding process only for channel pairs including a first channel having only information of a left side with respect to a listening position and including a second channel having only information from a right side with respect to a listening position. As within the hierarchical process the multiple audio channels of the audio signal are downmixed iteratively into monophonic channels, one can pick the relevant parameters from an encoding step involving only channel pairs carrying the information needed to describe the spatial properties of the multi-channel audio signal.

Multi-channel hierarchical audio coding with compact side information

Growing community of inventors

Solna, Sweden

Jonas Röden