Patents by Inventor Karl Jonas Roeden

Karl Jonas Roeden 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).

  • Publication number: 20170186437
    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: March 14, 2017
    Publication date: June 29, 2017
    Applicant: Dolby International AB
    Inventors: Fredrik Henn, Kristofer Kjoerling, Lars G. Liljeryd, Karl Jonas Roeden, Jonas Engdegard
  • Publication number: 20170186435
    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: March 14, 2017
    Publication date: June 29, 2017
    Applicant: Dolby International AB
    Inventors: Fredrik Henn, Kristofer Kjoerling, Lars G. Liljeryd, Karl Jonas Roeden, Jonas Engdegard
  • Patent number: 9601122
    Abstract: A decoding system (100) reconstructs an n-channel audio signal on the basis of an input signal (A) representing the audio signal either by parametric coding or as n discretely coded channels. Parametric decoding proceeds on the basis of a core signal and mixing parameters (a) controlling a spatial synthesis stage (150), which is supplied with a downmix signal from a downmix stage (140). A selector (170) controls the components of the decoding system, in steady-state parametric and discrete decoding mode and transitions between these. The downmix stage realizes a projection on the downmix signal based on an n-channel signal, either an n-channel input signal or a core signal padded with neutral values. The downmix stage is active in each time frame in which the input signal represents the audio signal by parametric coding and in at least the first time frame after the last time frame in each episode of parametrically coded time frames.
    Type: Grant
    Filed: June 14, 2013
    Date of Patent: March 21, 2017
    Assignee: Dolby International AB
    Inventors: Heiko Purnhagen, Leif Sehlstrom, Karl Jonas Roeden, Kristofer Kjoerling, Lars Villemoes
  • Patent number: 9552818
    Abstract: A decoding system reconstructs an n-channel audio signal on the basis of an input signal representing the audio signal, in different time frames, either by parametric coding or as n discretely coded channels. Parametric decoding uses a core signal and mixing parameters controlling a spatial synthesis stage, to which a downmix signal is supplied from a downmix stage. The downmix stage realizes a projection on the downmix signal based on an n-channel input signal, either a discretely coded signal or a core signal padded with neutral-valued channels. The padding may take place either on the decoding side (reduced parametric coding) or the encoding side. In an embodiment, an audio decoder (110) in the decoding system pads the core signal during an initial portion of each reduced parametrically coded time frame directly succeeding a discretely coded time frame and during a final portion of each reduced parametrically coded time frame directly preceding a discretely coded time frame.
    Type: Grant
    Filed: June 14, 2013
    Date of Patent: January 24, 2017
    Assignee: Dolby International AB
    Inventors: Heiko Purnhagen, Leif Sehlstrom, Karl Jonas Roeden, Kristofer Kjoerling, Lars Villemoes
  • Publication number: 20170018279
    Abstract: There is provided methods and apparatuses for decoding and encoding of audio signals. In particular, a method for decoding includes receiving a waveform-coded signal having a spectral content corresponding to a subset of the frequency range above a cross-over frequency. The waveform-coded signal is interleaved with a parametric high frequency reconstruction of the audio signal above the cross-over frequency. In this way an improved reconstruction of the high frequency bands of the audio signal is achieved.
    Type: Application
    Filed: September 28, 2016
    Publication date: January 19, 2017
    Applicant: DOLBY INTERNATIONAL AB
    Inventors: Kristofer KJOERLING, Robin THESING, Harald MUNDT, Heiko PURNHAGEN, Karl Jonas ROEDEN
  • Patent number: 9514761
    Abstract: There is provided methods and apparatuses for decoding and encoding of audio signals. In particular, a method for decoding includes receiving a waveform-coded signal having a spectral content corresponding to a subset of the frequency range above a cross-over frequency. The waveform-coded signal is interleaved with a parametric high frequency reconstruction of the audio signal above the cross-over frequency. In this way an improved reconstruction of the high frequency bands of the audio signal is achieved.
    Type: Grant
    Filed: April 4, 2014
    Date of Patent: December 6, 2016
    Assignee: Dolby International AB
    Inventors: Kristofer Kjoerling, Robin Thesing, Harald Mundt, Heiko Purnhagen, Karl Jonas Roeden
  • Publication number: 20160343383
    Abstract: A method for decoding an encoded audio bitstream in an audio processing system is disclosed. The method includes extracting from the encoded audio bitstream a first waveform-coded signal including spectral coefficients corresponding to frequencies up to a first cross-over frequency and performing parametric decoding at a second cross-over frequency to generate a reconstructed signal. The second cross-over frequency is above the first cross-over frequency and the parametric decoding uses reconstruction parameters derived from the encoded audio bitstream to generate the reconstructed signal. The method further includes extracting from the encoded audio bitstream a second waveform-coded signal including spectral coefficients corresponding to a subset of frequencies above the first cross-over frequency and interleaving the second waveform-coded signal with the reconstructed signal to produce an interleaved signal. The interleaved signal is then combined with the first waveform-coded signal.
    Type: Application
    Filed: August 3, 2016
    Publication date: November 24, 2016
    Applicant: DOLBY INTERNATIONAL AB
    Inventors: Kristofer KJOERLING, Heiko PURNHAGEN, Harald MUNDT, Karl Jonas ROEDEN, Leif SEHLSTROM
  • Patent number: 9489957
    Abstract: The present disclosure provides methods, devices and computer program products for encoding and decoding a multi-channel audio signal based on an input signal. According to the disclosure, a hybrid approach of using both parametric stereo coding and discrete representation of the processed multi-channel audio signal is used which may improve the quality of the encoded and decoded audio for certain bitrates.
    Type: Grant
    Filed: April 4, 2014
    Date of Patent: November 8, 2016
    Assignee: Dolby International AB
    Inventors: Kristofer Kjoerling, Heiko Purnhagen, Harald Mundt, Karl Jonas Roeden, Leif Sehlstrom
  • Patent number: 9411881
    Abstract: A transcoding tool for transcoding an audio stream to be played at a playback device is provided. The transcoding tool comprises a receiving section adapted to receive at least one bit stream comprising an audio stream and metadata associated with the audio stream. The transcoding tool further comprises a processing section connected to the receiving section and adapted to create a processed audio stream based on the audio stream and metadata, and a transmitting section connected to the processing section and adapted to transmit the created processed audio stream to the playback device.
    Type: Grant
    Filed: October 29, 2013
    Date of Patent: August 9, 2016
    Assignee: Dolby International AB
    Inventors: Karl Jonas Roeden, Kristofer Kjoerling
  • Publication number: 20160196831
    Abstract: The present document relates to the design of anti-aliasing and/or anti-imaging filters for resamplers using rational resampling factors. In particular, the present document relates to a method for implementing such anti-aliasing and/or anti-imaging filters with reduced computational complexity. In addition, the present document relates to further aspects of an audio encoding and decoding system, such as the phase relation between the channels of a multi-channel audio signal and/or the structure of the bitstream of an encoded audio signal.
    Type: Application
    Filed: September 10, 2014
    Publication date: July 7, 2016
    Applicants: Dolby Laboratories Licensing Corporation, DOLBY INTERNATIONAL AB
    Inventors: Alexander GROESCHEL, Jenns POPP, Martin WOLTERS, Jeffrey RIEDMILLER, Michael WARD, Karl Jonas ROEDEN, Holger HOERICH, Karsten LINZMEIER, Tobias FRIEDRICH
  • Publication number: 20160055864
    Abstract: An audio processing system (100) accepts an audio bitstream having one of a plurality of predefined audio frame rates. The system comprises a front-end component (110), which receives a variable number of quantized spectral components, corresponding to one audio frame in any of the predefined audio frame rates, and performs an inverse quantization according to predetermined, frequency-dependent quantization levels. The front-end component may be agnostic of the audio frame rate. The audio processing system further comprises a frequency-domain processing stage (120) and a sample rate converter (130), which provide a reconstructed audio signal sampled at a target sampling frequency independent of the audio frame rate. By its frame-rate adaptability, the system can be configured to operate frame-synchronously in parallel with a video processing system that accepts plural video frame rates.
    Type: Application
    Filed: April 4, 2014
    Publication date: February 25, 2016
    Applicant: DOLBY LABORATORIES LICENSING CORPORATION
    Inventors: Heiko PURNHAGEN, Kristopher KJOERLING, Alexander GROESCHEL, Jens POPP, Karl Jonas ROEDEN
  • Publication number: 20160042742
    Abstract: There is provided methods and apparatuses for decoding and encoding of audio signals. In particular, a method for decoding includes receiving a waveform-coded signal having a spectral content corresponding to a subset of the frequency range above a cross-over frequency. The waveform-coded signal is interleaved with a parametric high frequency reconstruction of the audio signal above the cross-over frequency. In this way an improved reconstruction of the high frequency bands of the audio signal is achieved.
    Type: Application
    Filed: April 4, 2014
    Publication date: February 11, 2016
    Applicant: DOLBY INTERNATIONAL AB
    Inventors: Kristofer KJOERLING, Robin THESING, Harald MUNDT, Heiko PURNHAGEN, Karl Jonas ROEDEN
  • Publication number: 20160012825
    Abstract: The present disclosure provides methods, devices and computer program products for encoding and decoding a multi-channel audio signal based on an input signal. According to the disclosure, a hybrid approach of using both parametric stereo coding and discrete representation of the processed multi-channel audio signal is used which may improve the quality of the encoded and decoded audio for certain bitrates.
    Type: Application
    Filed: April 4, 2014
    Publication date: January 14, 2016
    Applicant: DOLBY INTERNATIONAL AB
    Inventors: Kristofer KJOERLING, Heiko PURNHAGEN, Harald MUNDT, Karl Jonas ROEDEN, Leif SEHLSTROM
  • Publication number: 20150363160
    Abstract: Embodiments are directed to a method and system for receiving, in a bitstream, metadata associated with the audio data, and analyzing the metadata to determine whether a loudness parameter for a first group of audio playback devices are available in the bitstream. Responsive to determining that the parameters are present for the first group, the system uses the parameters and audio data to render audio. Responsive to determining that the loudness parameters are not present for the first group, the system analyzes one or more characteristics of the first group, and determines the parameter based on the one or more characteristics.
    Type: Application
    Filed: January 15, 2014
    Publication date: December 17, 2015
    Applicants: DOLBY LABORATORIES LICENSING CORPORATION, DOLBY INTERNATIONAL AB
    Inventors: Jeffrey RIEDMILLER, Scott Gregory NORCROSS, Karl Jonas ROEDEN
  • Publication number: 20150187361
    Abstract: A decoding system (100) reconstructs an n-channel audio signal on the basis of an input signal (A) representing the audio signal either by parametric coding or as n discretely coded channels. Parametric decoding proceeds on the basis of a core signal and mixing parameters (a) controlling a spatial synthesis stage (150), which is supplied with a downmix signal from a downmix stage (140). A selector (170) controls the components of the decoding system, in steady-state parametric and discrete decoding mode and transitions between these. The downmix stage realizes a projection on the downmix signal based on an n-channel signal, either an n-channel input signal or a core signal padded with neutral values. The downmix stage is active in each time frame in which the input signal represents the audio signal by parametric coding and in at least the first time frame after the last time frame in each episode of parametrically coded time frames.
    Type: Application
    Filed: June 14, 2013
    Publication date: July 2, 2015
    Inventors: Heiko Purnhagen, Leif Sehlstrom, Karl Jonas Roeden, Kristofer Kjoerling, Lars Villemoes
  • Publication number: 20150154970
    Abstract: A decoding system reconstructs an n-channel audio signal on the basis of an input signal representing the audio signal, in different time frames, either by parametric coding or as n discretely coded channels. Parametric decoding uses a core signal and mixing parameters controlling a spatial synthesis stage, to which a downmix signal is supplied from a downmix stage. The downmix stage realizes a projection on the downmix signal based on an n-channel input signal, either a discretely coded signal or a core signal padded with neutral-valued channels. The padding may take place either on the decoding side (reduced parametric coding) or the encoding side. In an embodiment, an audio decoder (110) in the decoding system pads the core signal during an initial portion of each reduced parametrically coded time frame directly succeeding a discretely coded time frame and during a final portion of each reduced parametrically coded time frame directly preceding a discretely coded time frame.
    Type: Application
    Filed: June 14, 2013
    Publication date: June 4, 2015
    Applicant: DOLBY INTERNATIONAL AB
    Inventors: Heiko Purnhagen, Leif Sehlstrom, Karl Jonas Roeden, Kristofer Kjoerling, Lars Villemoes
  • 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: 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
  • Patent number: 8793125
    Abstract: A device (1) for converting a first number (M) of input audio channels into a second, larger number (N) of output audio channels comprises: decorrelation units (3) for decomposing the input audio channels into a set of decorrelated auxiliary channels, at least one upmix unit (4) for combining the decorrelated auxiliary channels into the output audio channels, and at least one pre-processing unit (2) for pre-processing the input audio channels and feeding the pre-processed input audio channels to the decorrelation units (3). The pre-processing unit (2) and the upmix unit (4) are preferably controlled by audio parameters.
    Type: Grant
    Filed: July 11, 2005
    Date of Patent: July 29, 2014
    Assignees: Koninklijke Philips Electronics N.V., Coding Technologies AB
    Inventors: Dirk Jeroen Breebaart, Erik Gosuinus Petrus Schuijers, Heiko Purnhagen, Karl Jonas Rödén
  • Publication number: 20140135963
    Abstract: A transcoding tool for transcoding an audio stream to be played at a playback device is provided. The transcoding tool comprises a receiving section adapted to receive at least one bit stream comprising an audio stream and metadata associated with the audio stream. The transcoding tool further comprises a processing section connected to the receiving section and adapted to create a processed audio stream based on the audio stream and metadata, and a transmitting section connected to the processing section and adapted to transmit the created processed audio stream to the playback device.
    Type: Application
    Filed: October 29, 2013
    Publication date: May 15, 2014
    Applicant: Dolby International AB
    Inventors: Karl Jonas Roeden, Kristofer Kjoerling