1
Lars Villemoes, Kristofer Kjoerling, Heiko Purnhagen, Jonas Roeden, Jeroen Breebaart, Gerard Hotho: Multi parametrisation based multi-channel reconstruction. Coding Technologies, Koninklijke Philips Electronics, Michael A Glenn, Glenn Patent Group, February 23, 2010: US07668722 (30 worldwide citation)

A multi-channel synthesizer for generating at least three output channels using an input signal having at least one base channel, the base channel being derived from the original multi-channel signal, the input signal further including at least two different up-mixing parameters, and an up-mixer mod ...


2
Kristofer Kjoerling, Heiko Purnhagen, Jonas Engdegard, Jonas Roeden: Advanced methods for interpolation and parameter signalling. Coding Technologies, Michael A Glenn, Glenn Patent Group, July 5, 2011: US07974847 (24 worldwide citation)

A parameter calculator calculates lower resolution parametric information and interpolation information. On a decoder-side, an upmixer is used for generating the output channels. The upmixer uses high resolution parametric information generated by a parameter interpolator using the low resolution pa ...


3
Lars Villemoes, Kristofer Kjoerling, Jeroen Breebaart: Reduced number of channels decoding. Dolby International, Koninklijke Philips Electronics, Michael A Glenn, Glenn Patent Group, June 21, 2011: US07965848 (22 worldwide citation)

An intermediate channel representation of a multi-channel signal can be reconstructed highly efficient and with high fidelity, when upmix parameters for upmixing a transmitted downmix signal to the intermediate channel representation are derived that allow for an upmix using the same upmixing algori ...


4
Heiko Purnhagen, Lars Villemoes, Jonas Engdegard, Jonas Roeden, Kristofer Kjoerling: Apparatus and method for generating a level parameter and apparatus and method for generating a multi-channel representation. Dolby International, Michael A Glenn, Glenn Patent Group, July 17, 2012: US08223976 (19 worldwide citation)

A parameter representation of a multi-channel signal having several original channels includes a parameter set, which, when used together with at least one down-mix channel allows a multi-channel reconstruction. An additional level parameter is calculated such that an energy of the at least one down ...


5
Johannes Hilpert, Karsten Linzmeier, Juergen Herre, Ralph Sperschneider, Andreas Hoelzer, Lars Villemoes, Jonas Engdegard, Heiko Purnhagen, Kristofer Kjoerling, Dirk Jeroen Breebaart, Werner Oomen: Apparatus and method for multi-channel parameter transformation. Fraunhofer Gesellschaft zur Foerderung der Angewandten Forschung E V, Dolby Sweden, Koninklijke Philips Electronics, Michael A Glenn, Perkins Coie, April 1, 2014: US08687829 (18 worldwide citation)

A parameter transformer generates level parameters, indicating an energy relation between a first and a second audio channel of a multi-channel audio signal associated to a multi-channel loudspeaker configuration. The level parameter are generated based on object parameters for a plurality of audio ...


6
Lars Liljeryd, Per Ekstrand, Fredrik Henn, Kristofer Kjoerling: Spectral translation/folding in the subband domain. Coding Technologies Sweden, Michael A Glenn, Glenn Patent Group, March 16, 2010: US07680552 (18 worldwide citation)

The present invention relates to a new method and apparatus for improvement of High Frequency Reconstruction (HFR) techniques using frequency translation or folding or a combination thereof. The proposed invention is applicable to audio source coding systems, and offers significantly reduced computa ...


7
Arijit Biswas, Heiko Purnhagen, Kristofer Kjoerling, Barbara Resch, Lars Villemoes, Per Hedelin: Audio encoder and decoder with long term prediction. Dolby Laboratories Licensing Corporation, July 23, 2013: US08494863 (17 worldwide citation)

The present invention teaches a new audio coding system that can code both general audio and speech signals well at low bit rates. A proposed audio coding system comprises a linear prediction unit for filtering an input signal based on an adaptive filter; a transformation unit for transforming a fra ...


8
Lars G Liljeryd, Per Ekstrand, Fredrik Henn, Kristofer Kjoerling: Spectral translation/folding in the subband domain. Dolby International, January 26, 2016: US09245534 (12 worldwide citation)

The present invention relates to a new method and apparatus for improvement of High Frequency Reconstruction (HFR) techniques using frequency translation or folding or a combination thereof. The proposed invention is applicable to audio source coding systems, and offers significantly reduced computa ...


9
Heiko Purnhagen, Lars Villemoes, Jonas Engdegard, Jonas Roeden, Kristofer Kjoerling: Method for representing multi-channel audio signals. Coding Technologies, Michael A Glenn, Glenn Patent Group, July 26, 2011: US07986789 (12 worldwide citation)

A multi-channel input signal having at least three original channels is represented by a parameter representation of the multi-channel signal. A first balance parameter, a first coherence parameter, or a first inter-channel time difference between a first channel pair and a second balance parameter, ...


10
Kristofer Kjoerling, Lars Villemoes: Method for reduction of aliasing introduced by spectral envelope adjustment in real-valued filterbanks. Dolby International, Michael A Glenn, Glenn Patent Group, January 1, 2013: US08346566 (11 worldwide citation)

The present invention proposes a new method for improving the performance of a real-valued filterbank based spectral envelope adjuster. By adaptively locking the gain values for adjacent channels dependent on the sign of the channels, as defined in the application, reduced aliasing is achieved. Furt ...