1
Lars Falck Villemoes, Per Ekstrand, Heiko Purnhagen, Erik Gosuinus Petrus Schuijers, Fransiscus Marinus Jozephus de Bont: Audio signal encoding or decoding. Koninklijke Philips Electronics, April 14, 2009: US07519538 (126 worldwide citation)

Encoding an audio signal is provided wherein the audio signal includes a first audio channel and a second audio channel, the encoding comprising subband filtering each of the first audio channel and the second audio channel in a complex modulated filterbank to provide a first plurality of subband si ...


2
Matthias Neusinger, Jürgen Herre, Sascha Disch, Heiko Purnhagen, Kristofer Kjörling, Jonas Engdegard, Jeroen Breebaart, Erik Schuijers, Werner Oomen: Apparatus and method for generating multi-channel synthesizer control signal and apparatus and method for multi-channel synthesizing. Fraunhofer Gesellschaft zur Foerderung der Angewandten Forschung e V, Laurence A Greenberg, Werner H Stemer, Ralph E Locher, July 19, 2011: US07983922 (62 worldwide citation)

On an encoder-side, a multi-channel input signal is analyzed for obtaining smoothing control information, which is to be used by a decoder-side multi-channel synthesis for smoothing quantized transmitted parameters or values derived from the quantized transmitted parameters for providing an improved ...


3
Lars Villemoes, Heiko Purnhagen, Jonas Roeden, Jonas Engdegard, Jeroen Breebaart, Erik Schuijers: Stereo compatible multi-channel audio coding. Coding Technologies, Koninklijke Philips Electronics, Michael A Glenn, Glenn Patent Group, March 29, 2011: US07916873 (41 worldwide citation)

A parametric representation of a multi-channel audio signal having parameters suited to be used together with a monophonic downmix signal to calculate a reconstruction of the multi-channel audio signal can efficiently be derived in a stereo-backwards compatible way when a parameter combiner is used ...


4
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 (28 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 ...


5
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 ...


6
Heiko Purnhagen, Jonas Engdegard, Jeroen Breebaart, Erik Schuijers: Audio coding using de-correlated signals. Coding Technologies, Koninklijke Philips Electronics, Michael A Glenn, Glenn Patent Group, September 13, 2011: US08019350 (22 worldwide citation)

A multi-channel signal having at least three channels can be reconstructed such, that the reconstructed channels are at least partly de-correlated from each other using a downmixed signal derived from an original multi-channel signal and a set of de-correlated signals provided by a de-correlator (10 ...


7
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 (18 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 ...


8
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 ...


9
Machiel Willem Van Loon, Dirk Jeroen Breebaart, Gerard Herman Hotho, Erik Gosuinus Petrus Schuijers, Heiko Purnhagen, Karl Jonas Roden: Method, device, encoder apparatus, decoder apparatus and audio system. Koninklijke Philips Electronics, Coding Technologies, Michael A Glenn, Glenn Patent Group, April 3, 2012: US08150042 (17 worldwide citation)

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 ...


10
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 (16 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 ...