Koninklijke Philips Corporation N.v.

Coding Technologies Ab

Dolby International Ab

Karl Jonas Roden

Heiko Purnhagen

Erik Gosuinus Petrus Schuijers

Gerard Herman Hotho

Dirk Jeroen Breebaart

Lars Villemoes

Albertus Cornelis Den Brinker

Wolfgang Alexander Schildbach

Machiel Willem Van Loon

Hans Magnus Kristofer Kjorling

Holger Horich

A multi-channel audio encoder () for encoding a multi-channel audio signal (), e.g. a 5.1 channel audio signal, into a spatial down-mix (), e.g. a stereo signal, and associated parameters (). The encoder () comprises first and second units (). The first unit () encodes the multi-channel audio signal () into the spatial down-mix () and parameters (). These parameters () enable a multi-channel decoder () to reconstruct the multi-channel audio signal () from the spatial down-mix (). The second unit () generates, from the spatial down-mix (), parameters () that enable the decoder to reconstruct the spatial down-mix () from an alternative down-mix (), e.g. a so-called artistic down-mix that has been manually mixed in a sound studio. In this way, the decoder () can efficiently deal with a situation in which an alternative down-mix () is received instead of the regular spatial, down-mix (). In the decoder (), first the spatial down-mix () is reconstructed from the alternative down-mix () and the parameters (). Next, the spatial down-mix () is decoded into the multi-channel audio signal ().

Multi-channel audio coding

Techniques are described for combining parametric multi-channel audio coding with matrixing, reconstructing a full-quality multi-channel, independent of the decoder. A stereo signal is obtained from encoding an N-channel audio signal into spatial parameters and a stereo down-mix signal having first and second stereo signals, including adding a first signal and a third signal to obtain a first output signal, the first signal having the first stereo signal modified by a first complex function, the third signal having the second stereo signal modified by a third complex function. A second signal and fourth signal are similarly added to obtain a second output signal. Complex functions are chosen such that an energy value of the difference between first signal and the second signals (fourth signal and third signals) is larger than or equal to the energy value of the sum of the first and the second signal (fourth signal and third signal).

Method, device, encoder apparatus, decoder apparatus and audio system

An audio encoder () has a hierarchical encoding structure and generates a data stream comprising one or more audio channels as well as parametric audio encoding data. The encoder () comprises an encoding structure processor () which inserts decoder tree structure data into the data stream. The decoder tree structure data comprises at least one data value indicative of a channel split characteristic for an audio channel at a hierarchical layer of the hierarchical decoder structure and may specifically specify the decoder tree structures to be applied by a decoder. A decoder () comprises a receiver () which receives the data stream and a decoder structure processor () for generating the hierarchical decoder structure in response to the decoder tree structure data. A decode processor () then generates output audio channels from the data stream using the hierarchical decoder structure.

Method and apparatus for generating a number of output audio channels

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Solna, Sweden

Karl Jonas Roden