Patents Assigned to DOLBY SWEDEN AB
  • Patent number: 8687829
    Abstract: 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 objects associated to a down-mix channel, which is generated using object audio signals associated to the audio objects. The object parameters have an energy parameter indicating an energy of the object audio signal. To derive the coherence and the level parameters, a parameter generator is used, which combines the energy parameter and object rendering parameters, which depend on a desired rendering configuration.
    Type: Grant
    Filed: October 5, 2007
    Date of Patent: April 1, 2014
    Assignees: Fraunhofer-Gesellschaft zur Foerderung der Angewandten Forschung E.V., Dolby Sweden AB, Koninklijke Philips Electronics N.V.
    Inventors: Johannes Hilpert, Karsten Linzmeier, Juergen Herre, Ralph Sperschneider, Andreas Hoelzer, Lars Villemoes, Jonas Engdegard, Heiko Purnhagen, Kristofer Kjoerling, Dirk Jeroen Breebaart, Werner Oomen
  • Patent number: 8433583
    Abstract: An audio decoder comprises a receiver (801) for receiving input data comprising an N-channel signal corresponding to a down-mixed signal of an M-channel audio signal, M>N, having complex valued subband encoding matrices applied in frequency subbands and parametric multi-channel data. A subband filter bank (805) generates real-valued frequency subbands for the N-channel signal. A matrix processor (809) determines real-valued subband decoding matrices for compensating the application of the encoding matrices in response to the parametric multi-channel data. A compensation processor (807) generates down-mix data corresponding to the down-mixed signal by a matrix multiplication of the real-valued subband decoding matrices and data of the N-channel signal in the at least some real-valued frequency subbands. The down-mix data can be used to regenerate the down-mixed signal and the M-channel audio signal.
    Type: Grant
    Filed: March 23, 2007
    Date of Patent: April 30, 2013
    Assignees: Koninklijke Philips International N.V., Dolby Sweden AB
    Inventors: Lars Villemoes, Erik Schuijers
  • Publication number: 20110264456
    Abstract: Binaural rendering a multi-channel audio signal into a binaural output signal is described. The multi-channel audio signal has a stereo downmix signal into which a plurality of audio signals are downmixed, and side information having a downmix information, as well as object level information of the plurality of audio signals and inter-object cross correlation information. Based on a first rendering prescription, a preliminary binaural signal is computed from the first and second channels of the stereo downmix signal. A decorrelated signal is generated as an perceptual equivalent to a mono downmix of the first and second channels of the stereo downmix signal being, however, decorrelated to the mono downmix. Depending on a second rendering prescription, a corrective binaural signal is computed from the decorrelated signal and the preliminary binaural signal is mixed with the corrective binaural signal to obtain the binaural output signal.
    Type: Application
    Filed: April 6, 2011
    Publication date: October 27, 2011
    Applicants: Fraunhofer-Gesellschaft zur Foerderung der angewandten Forschung e.V., Dolby Sweden AB, Koninklijke Philips Electronics N.V.
    Inventors: Jeroen KOPPENS, Harald MUNDT, Leonid TERENTIEV, Cornelia FALCH, Johannes HILPERT, Oliver HELLMUTH, Lars VILLEMOES, Jan PLOGSTIES, Jeroen BREEBAART, Jonas ENGDEGARD
  • Publication number: 20110022402
    Abstract: An audio object coder for generating an encoded object signal using a plurality of audio objects includes a downmix information generator for generating downmix information indicating a distribution of the plurality of audio objects into at least two downmix channels, an audio object parameter generator for generating object parameters for the audio objects, and an output interface for generating the imported audio output signal using the downmix information and the object parameters. An audio synthesizer uses the downmix information for generating output data usable for creating a plurality of output channels of the predefined audio output configuration.
    Type: Application
    Filed: October 5, 2007
    Publication date: January 27, 2011
    Applicant: DOLBY SWEDEN AB
    Inventors: Jonas Engdegard, Lars Villemoes, Heiko Purnhagen, Barbara Resch