Patents by Inventor Jonas Engdegard

Jonas Engdegard has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 9237400
    Abstract: The present invention relates to audio signal processing. In particular, it relates to a method and system for reliably concealing intermittent mono reception of FM stereo radio receivers. The system comprises a parametric stereo parameter estimation stage configured to determine a first parametric stereo parameter based on a first frame of the received two-channel audio signal. The system further comprises a concealment detection stage configured to determine an energy of a side signal within the first signal frame; determine a number of following successive signal frames during which the energy of the side signal drops from a value above the high threshold to a value below a low threshold; determine that the two-channel audio signal following the first signal frame is a forced mono signal if the number of successive signal frames is below a frame threshold; and determine the parametric stereo parameter based on the first parametric stereo parameter.
    Type: Grant
    Filed: August 16, 2011
    Date of Patent: January 12, 2016
    Assignee: Dolby International AB
    Inventors: Leif Sehlstrom, Heiko Purnhagen, Jonas Engdegard
  • Patent number: 9218818
    Abstract: 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.
    Type: Grant
    Filed: April 27, 2012
    Date of Patent: December 22, 2015
    Assignee: DOLBY INTERNATIONAL AB
    Inventors: Fredrik Henn, Kristofer Kjorling, Lars Liljeryd, Jonas Roden, Jonas Engdegard
  • Publication number: 20150356976
    Abstract: 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.
    Type: Application
    Filed: August 14, 2015
    Publication date: December 10, 2015
    Inventors: Juergen HERRE, Johannes HILPERT, Andreas HOELZER, Jonas ENGDEGARD, Heiko PURNHAGEN
  • Publication number: 20150356977
    Abstract: 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.
    Type: Application
    Filed: August 14, 2015
    Publication date: December 10, 2015
    Inventors: Juergen HERRE, Johannes HILPERT, Andreas HOELZER, Jonas ENGDEGARD, Heiko PURNHAGEN
  • Patent number: 9191045
    Abstract: The present document relates to audio signal processing, in particular to an apparatus and a corresponding method for improving the audio signal of an FM stereo radio receiver. In particular, the present document relates to a method and system for reducing the noise of a received FM stereo radio signal. An apparatus (2) configured to reduce noise of a received multi-channel FM radio signal is described, wherein the received multi-channel FM radio signal is representable as a received mid signal and a received side signal. The apparatus (2) comprises a parameter determination unit (77) configured to determine one or more parameters indicative of a correlation and/or decorrelation between the received mid signal and the received side signal; and a noise reduction unit (79) configured to generate a noise-reduced side signal from the received mid signal and not from the received side signal using the one or more parameters.
    Type: Grant
    Filed: October 1, 2012
    Date of Patent: November 17, 2015
    Assignee: Dolby International AB
    Inventors: Heiko Purnhagen, Leif Sehlstrom, Jonas Engdegard
  • Patent number: 9105300
    Abstract: The application relates to a method for encoding time marking information within audio data. According to the method, time marking information is encoded as audio metadata within the audio data. The time marking information indicates at least one section of an audio object encoded in the audio data. E.g. the time marking information may specify a start position and an end position of the section or only a start position. The at least one section may be a characteristic part of the audio object, which allows instant recognition by listening. The time marking information encoded in the audio data enables instantaneous browsing to a certain section of the audio object. The application further relates to a method for decoding the time marking information encoded in the audio data.
    Type: Grant
    Filed: October 14, 2010
    Date of Patent: August 11, 2015
    Assignee: Dolby International AB
    Inventors: Barbara Resch, Jonas EngdegÄrd
  • Patent number: 9094754
    Abstract: The document relates to audio signal processing, in particular to a system and a corresponding method for improving an audio signal of an FM stereo radio receiver, in this context, one aspect relates to the estimation of noise in a received side signal and the compensation of such noise in parametric stereo parameters. A system for generating a parametric stereo parameter from a two-channel audio signal is described. The two-channel audio signal is presentable as a mid signal and side signal representative of a corresponding left and right audio signal. The system comprises a noise estimation stage configured to determine an impact factor characteristic for the noise of the side signal; and a parametric stereo parameter estimation stage configured to determine the parametric stereo parameter; wherein the determining is based on the two-channel audio signal and the impact factor.
    Type: Grant
    Filed: August 16, 2011
    Date of Patent: July 28, 2015
    Assignee: Dolby International AB
    Inventors: Jonas Engdegard, Heiko Purnhagen, Leif Sehlstrom
  • Patent number: 9060236
    Abstract: An apparatus for providing an upmix signal representation on the basis of a downmix signal representation and an object-related parametric information, which are included in a bitstream representation of an audio content, and in dependence on a rendering information, has a distortion limiter configured to adjust upmix parameters using a distortion control scheme to avoid or limit audible distortions which are caused by an inappropriate choice of rendering parameters. The distortion limiter is configured to obtain a distortion limitation control parameter, which is included in the bitstream representation of the audio content, and to adjust a distortion control scheme in dependence on the distortion limitation control parameter.
    Type: Grant
    Filed: April 18, 2012
    Date of Patent: June 16, 2015
    Assignees: Dolby International AB, Fraunhofer-Gesellschaft zur Foerderung der angewandten Forschung e.V.
    Inventors: Jonas Engdegard, Heiko Purnhagen, Juergen Herre, Leon Terentiv, Cornelia Falch, Oliver Hellmuth
  • Publication number: 20150086022
    Abstract: The invention relates to a method for improving a stereo audio signal of an FM stereo radio receiver. The method comprises determining one or more parametric stereo parameters based on the stereo audio signal in a frequency-variant or frequency-invariant manner. Preferably, these PS parameters are time- and frequency-variant. Moreover, the method comprises generating the improved stereo signal based on a first audio signal and the one or more parametric stereo parameters. The first audio signal is obtained from the stereo audio signal, e.g. by a downmix operation.
    Type: Application
    Filed: November 26, 2014
    Publication date: March 26, 2015
    Inventors: Jonas ENGDEGARD, Heiko PURNHAGEN, Karl Jonas ROEDEN
  • Patent number: 8965000
    Abstract: A method and system for applying reverb to an M-channel downmixed audio input signal indicative of X individual audio channels, where X is greater than M. Typically, the method includes steps of: in response to spatial cue parameters indicative of spatial image of the downmixed input signal, generating Y discrete reverb channel signals, where each of the reverb channel signals at a time, t, is a linear combination of at least a subset of values of the individual audio channels at the time, t, and individually applying reverb to each of at least two of the reverb channel signals, thereby generating Y reverbed channel signals.
    Type: Grant
    Filed: December 16, 2009
    Date of Patent: February 24, 2015
    Assignee: Dolby International AB
    Inventor: Jonas Engdegard
  • Patent number: 8929558
    Abstract: The invention relates to an apparatus for improving a stereo audio signal of an FM stereo radio receiver. The apparatus comprises a parametric stereo (PS) parameter estimation stage. The parameter estimation stage is configured to determine one or more parametric stereo parameters based on the stereo audio signal in a frequency-variant or frequency-invariant manner. Preferably, these PS parameters are time- and frequency-variant. Moreover, the apparatus comprises an upmix stage. The upmix stage is configured to generate the improved stereo signal based on a first audio signal and the one or more parametric stereo parameters. The first audio signal is obtained from the stereo audio signal, e.g. by a downmix operation in a downmix stage. The PS parameter estimation stage may be part of a PS encoder. The upmix stage may be part of a PS decoder.
    Type: Grant
    Filed: September 7, 2010
    Date of Patent: January 6, 2015
    Assignee: Dolby International AB
    Inventors: Jonas Engdegard, Heiko Purnhagen, Karl Jonas Roeden
  • Publication number: 20140330556
    Abstract: Low complexity detection of a time-wise position of a representative segment in media data is described. A subset of offset values is located in a set of offset values in media data using a first type of one or more types of features, which are extractable from (e.g., derivable from components of) the media data. The subset of offset values comprise values that are selected from the set of offset values based on one or more selection criteria. A set of candidate seed time points is identified based on the subset of offset values using a second type of the one or more types of features.
    Type: Application
    Filed: December 10, 2012
    Publication date: November 6, 2014
    Applicants: DOLBY INTERNATIONAL AB, DOLBY LABORATORIES LICENSING CORPORATION
    Inventors: Barbara Resch, Regunathan Radhakrishnan, Arijit Biswas, Jonas Engdegard
  • Publication number: 20140235192
    Abstract: The present document relates to audio signal processing, in particular to an apparatus and a corresponding method for improving the audio signal of an FM stereo radio receiver. In particular, the present document relates to a method and system for reducing the noise of a received FM stereo radio signal. An apparatus (2) configured to reduce noise of a received multi-channel FM radio signal is described, wherein the received multi-channel FM radio signal is representable as a received mid signal and a received side signal. The apparatus (2) comprises a parameter determination unit (77) configured to determine one or more parameters indicative of a correlation and/or decorrelation between the received mid signal and the received side signal; and a noise reduction unit (79) configured to generate a noise-reduced side signal from the received mid signal and not from the received side signal using the one or more parameters.
    Type: Application
    Filed: October 1, 2012
    Publication date: August 21, 2014
    Applicant: DOLBY INTERNATIONAL AB
    Inventors: Heiko Purnhagen, Leif Sehlstrom, Jonas Engdegard
  • Publication number: 20140236604
    Abstract: 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 downmix channel weighted by the level parameter is equal to a sum of energies of the original channels. The additional level parameter is transmitted to a multi-channel reconstructor together with the parameter set or together with a down-mix channel. An apparatus for generating a multi-channel representation uses the level parameter to correct the energy of the at least one transmitted down-mix channel before entering the down-mix signal into an upmixer or within the up-mixing process.
    Type: Application
    Filed: January 16, 2014
    Publication date: August 21, 2014
    Applicant: DOLBY INTERNATIONAL AB
    Inventors: Heiko PURNHAGEN, Lars VILLEMOES, Jonas ENGDEGARD, Jonas ROEDEN, Kristofer KJOERLING
  • Publication number: 20140226822
    Abstract: The present document relates to audio signal processing, in particular to an apparatus and a corresponding method for improving an audio signal of an FM stereo radio receiver. In particular, the present document relates to a method and system for reliably detecting the quality of a received FM stereo radio signal and for selecting an appropriate processing based on the detected quality. An apparatus (20) configured to estimate the quality of a received multi-channel FM radio signal is described. The received multi-channel FM radio signal is representable as a mid signal and a side signal, and the side signal is indicative of a difference between a left signal and a right signal.
    Type: Application
    Filed: October 1, 2012
    Publication date: August 14, 2014
    Applicant: DOLBY INTERNATIONAL AB
    Inventors: Jonas Engdegard, Heiko Purnhagen, Leif Sehlstrom
  • Publication number: 20140229187
    Abstract: An apparatus for providing one or more adjusted parameters for a provision of an upmix signal representation on the basis of a downmix signal representation and an object-related parametric information includes a parameter adjuster. The parameter adjuster is configured to receive one or more input parameters and to provide, on the basis thereof, one or more adjusted parameters. The parameter adjuster is configured to provide the one or more adjusted parameters in dependence on the one or more input parameters and the object-related parametric information, such that a distortion of the upmix signal representation caused by the use of non-optimal parameters is reduced at least for input parameters deviating from optimal parameters by more than a predetermined deviation.
    Type: Application
    Filed: April 10, 2014
    Publication date: August 14, 2014
    Applicants: FRAUNHOFER-GESELLSCHAFT ZUR FOERDERUNG DER ANGEWANDTEN FORSCHUNG E.V., Dolby International AB, Friedrich-Alexander-Universitaet Erlangen-Nuernberg
    Inventors: Juergen HERRE, Andreas HOELZER, Leonid TERENTIEV, Thorsten KASTNER, Cornelia FALCH, Heiko PURNHAGEN, Jonas ENGDEGARD, Falko RIDDERBUSCH
  • Patent number: 8731950
    Abstract: An apparatus for providing one or more adjusted parameters for a provision of an upmix signal representation on the basis of a downmix signal representation and an object-related parametric information includes a parameter adjuster. The parameter adjuster is configured to receive one or more input parameters and to provide, on the basis thereof, one or more adjusted parameters. The parameter adjuster is configured to provide the one or more adjusted parameters in dependence on the one or more input parameters and the object-related parametric information, such that a distortion of the upmix signal representation caused by the use of non-optimal parameters is reduced at least for input parameters deviating from optimal parameters by more than a predetermined deviation.
    Type: Grant
    Filed: October 28, 2011
    Date of Patent: May 20, 2014
    Assignees: Fraunhofer-Gesellschaft zur Foerderung der Angewandten Forschung E.V., Dolby International AB, Friedrich-Alexander-Universitaet Erlangen-Nuernberg
    Inventors: Juergen Herre, Andreas Hoelzer, Leonid Terentiev, Thorsten Kastner, Cornelia Falch, Heiko Purnhagen, Jonas Engdegard, Falko Ridderbusch
  • Patent number: 8693696
    Abstract: 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 downmix channel weighted by the level parameter is equal to a sum of energies of the original channels. The additional level parameter is transmitted to a multi-channel reconstructor together with the parameter set or together with a down-mix channel. An apparatus for generating a multi-channel representation uses the level parameter to correct the energy of the at least one transmitted downmix channel before entering the down-mix signal into an upmixer or within the up-mixing process.
    Type: Grant
    Filed: August 31, 2010
    Date of Patent: April 8, 2014
    Assignee: Dolby International AB
    Inventors: Heiko Purnhagen, Lars Villemoes, Jonas Engdegard, Jonas Roeden, Kristofer Kjoerling
  • 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
  • Publication number: 20140074485
    Abstract: 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.
    Type: Application
    Filed: November 12, 2013
    Publication date: March 13, 2014
    Inventors: Fredrik HENN, Kristofer KJORLING, Lars LILJERYD, Jonas RODEN, Jonas ENGDEGARD