Dolby International Ab

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

Coding Technologies Ab

Koninklijke Philips Corporation N.V.

Dolby Laboratories Licensing Corporation

Friedrich-alexander-universitaet Erlangen-nuernberg

Dolby Sweden Ab

Dolby Sweden Ag

Koninklijke Philips Electronics N.v.

Jonas Engdegard

Heiko Purnhagen

Lars Villemoes

Kristofer Kjoerling

Jonas Roeden

Lars Gustaf Liljeryd

Fredrik Henn

Kristofer Kjörling

Jonas Roden

Juergen Herre

Johannes Hilpert

Andreas Hoelzer

Jeroen Dirk Breebaart

Erik Schuijers

Karl Jonas Roeden

Cornelia Falch

Leif Sehlstrom

Barbara Resch

Leonid Terentiev

Werner Oomen

Oliver Hellmuth

Jürgen Herre

Sascha Disch

Matthias Neusinger

Leon Terentiv

Regunathan Radhakrishnan

Arijit Biswas

Falko Ridderbusch

Thorsten Kastner

Dirk Jeroen Breebaart

Ralph Sperschneider

Jan Plogsties

Harald Mundt

Jeroen Koppens

Karsten Linzmeier

Andreas Hölzer

Frederik Henn

Jonas Röden

Steven Van De Par

W Koninklijke Philips Electronic NV Oomen

E Koninklijke Philips Electronic NV Schuijers

J Koninklijke Philips Electronic NV Breebaart

Jurgen Herre

Andreas Holzer

Kristofer Kjorling

Jeroen Breebaart

Leonid Terentiv

Jeroen Koninklijke Philips Elec NV Breebaart

Lars Villemors

Erik Koninklijke Philips Elec NV Schuijers

Werner Koninklijke Philips Elec NV Oomen

Lars Villemos

Jonas Rödén

Falco Ridderbusch

A method and apparatus for reconstructing N audio channels from M audio channels is disclosed. The method includes receiving a bitstream containing an encoded audio signal representing the M audio channels and decoding the encoded audio signal to obtain a frequency domain representation of the M audio channels. The method further includes extracting a parameter from the bitstream and reconstructing at least one of the N audio channels using the parameter. The parameter represents an angle between two signals, at least one of which is included in the M audio channels.

Audio decoder for audio channel reconstruction

The present invention provides improvements to prior art audio codecs that generate a stereo-illusion through post-processing of a received mono signal. These improvements are accomplished by extraction of stereo-image describing parameters at the encoder side, which are transmitted and subsequently used for control of a stereo generator at the decoder side. Furthermore, the invention bridges the gap between simple pseudo-stereo methods, and current methods of true stereo-coding, by using a new form of parametric stereo coding. A stereo-balance parameter is introduced, which enables more advanced stereo modes, and in addition forms the basis of a new method of stereo-coding of spectral envelopes, of particular use in systems where guided HFR (High Frequency Reconstruction) is employed. As a special case, the application of this stereo-coding scheme in scalable HFR-based codecs is described.

Efficient and scalable parametric stereo coding for low bitrate audio coding applications

An audio signal decoder for providing an upmix signal representation on the basis of a downmix signal representation and an object-related parametric information and in dependence on a rendering information has an object parameter determinator. The object parameter determinator is configured to obtain inter-object-correlation values for a plurality of pairs of audio objects. The object parameter determinator is configured to evaluate a bitstream signaling parameter in order to decide whether to evaluate individual inter-object-correlation bitstream parameter values to obtain inter-object-correlation values for a plurality of pairs of related audio objects, or to obtain inter-object-correlation values for a plurality of pairs of related audio objects using a common inter-object-correlation bitstream parameter value. The audio signal decoder also has a signal processor configured to obtain the upmix signal representation on the basis of the downmix signal representation and using the inter-object-correlation values for a plurality of pairs of related objects and the rendering information.

Audio signal decoder, audio signal encoder, method for providing an upmix signal representation, method for providing a downmix signal representation, computer program and bitstream using a common inter-object-correlation parameter value

A method performed by an audio decoder for reconstructing N audio channels from an audio signal containing M audio channels is disclosed. The method includes receiving a bitstream containing an encoded audio signal having M audio channels and a set of spatial parameters, the set of spatial parameters including an inter-channel intensity difference parameter and an inter-channel coherence parameter. The encoded audio bitstream is then decoded to obtain a decoded frequency domain representation of the M audio channels, and at least a portion of the frequency domain representation is decorrelated with an all-pass filter having a fractional delay. The all-pass filter is attenuated at locations of a transient. A matrixed version of the decorrelated signals are summed with a matrixed version of the decoded frequency domain representation to obtain N audio signals that collectively having N audio channels where M is less than N.

Audio decoder with core decoder and surround decoder

Growing community of inventors

Stockholm, Sweden

Jonas Engdegard