Patents Assigned to Dolby International AB
  • Patent number: 12293768
    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 comprising spectral coefficients corresponding to frequencies up to a first cross-over frequency for a time frame and performing parametric decoding at a second cross-over frequency for the time frame 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 also includes extracting from the encoded audio bitstream a second waveform-coded signal comprising spectral coefficients corresponding to a subset of frequencies above the first cross-over frequency for the time frame and interleaving the second waveform-coded signal with the reconstructed signal to produce an interleaved signal for the time frame.
    Type: Grant
    Filed: November 8, 2023
    Date of Patent: May 6, 2025
    Assignee: Dolby International AB
    Inventors: Kristofer Kjörling, Heiko Purnhagen, Harald Mundt, Karl Jonas Roeden, Leif Sehlström
  • Publication number: 20250140268
    Abstract: Exemplary embodiments provide encoding and decoding methods, and associated encoders and decoders, for encoding and decoding of an audio scene which is represented by one or more audio signals. The encoder generates a bit stream which comprises downmix signals and side information which includes individual matrix elements of a reconstruction matrix which enables reconstruction of the one or more audio signals in the decoder.
    Type: Application
    Filed: November 8, 2024
    Publication date: May 1, 2025
    Applicant: Dolby International AB
    Inventors: Heiko PURNHAGEN, Lars VILLEMOES, Leif Jonas SAMUELSSON, Toni HIRVONEN
  • Publication number: 20250142276
    Abstract: The present document describes a method (400) for rendering an ambisonics signal using a loudspeaker arrangement comprising S loudspeakers. The method (400) comprises converting (401) a set of N ambisonics channel signals (111) into a set of unfiltered pre-rendered signals (211), with N>1 and S>1. Furthermore, the method (400) comprises performing (402) near field compensation, referred to as NFC, filtering of M unfiltered pre-rendered signals (211) of the set of unfiltered pre-rendered signals (211) to provide a set of S filtered loudspeaker channel signals (114) for rendering using the corresponding S loudspeakers.
    Type: Application
    Filed: February 3, 2023
    Publication date: May 1, 2025
    Applicants: Dolby Laboratories Licensing Corporation, Dolby International AB
    Inventors: Saketh SATHUVALLI, Christof Joseph FERSCH, Panji SETIAWAN, Tripti TIWARI, Reshma RAI
  • Publication number: 20250142280
    Abstract: A method (900) for rendering audio in a virtual reality rendering environment (180) is described. The method (900) comprises rendering (901) an origin audio signal of an origin audio source (113) of an origin audio scene (111) from an origin source position on a sphere (114) around a listening position (201) of a listener (181). Furthermore, the method (900) comprises determining (902) that the listener (181) moves from the listening position (201) within the origin audio scene (111) to a listening position (202) within a different destination audio scene (112). In addition, the method (900) comprises applying (903) a fade-out gain to the origin audio signal to determine a modified origin audio signal, and rendering (903) the modified origin audio signal of the origin audio source (113) from the origin source position on the sphere (114) around the listening position (201, 202).
    Type: Application
    Filed: November 11, 2024
    Publication date: May 1, 2025
    Applicant: Dolby International AB
    Inventors: Leon Terentiv, Christof Fersch, Daniel Fischer
  • Publication number: 20250142285
    Abstract: Diffuse or spatially large audio objects may be identified for special processing. A decorrelation process may be performed on audio signals corresponding to the large audio objects to produce decorrelated large audio object audio signals. These decorrelated large audio object audio signals may be associated with object locations, which may be stationary or time-varying locations. For example, the decorrelated large audio object audio signals may be rendered to virtual or actual speaker locations. The output of such a rendering process may be input to a scene simplification process. The decorrelation, associating and/or scene simplification processes may be performed prior to a process of encoding the audio data.
    Type: Application
    Filed: January 7, 2025
    Publication date: May 1, 2025
    Applicants: Dolby Laboratories Licensing Corporation, Dolby International AB
    Inventors: Dirk Jeroen BREEBAART, Lie LU, Nicolas R. TSINGOS, Antonio MATEOS SOLE
  • Patent number: 12288564
    Abstract: A method for decoding an encoded audio bitstream is disclosed. The method includes receiving the encoded audio bitstream and decoding the audio data to generate a decoded lowband audio signal. The method further includes extracting high frequency reconstruction metadata and filtering the decoded lowband audio signal with an analysis filterbank to generate a filtered lowband audio signal. The method also includes extracting a flag indicating whether either spectral translation or harmonic transposition is to be performed on the audio data and regenerating a highband portion of the audio signal using the filtered lowband audio signal and the high frequency reconstruction metadata in accordance with the flag.
    Type: Grant
    Filed: December 16, 2024
    Date of Patent: April 29, 2025
    Assignee: Dolby International AB
    Inventors: Kristofer Kjoerling, Lars Villemoes, Heiko Purnhagen, Per Ekstrand
  • Patent number: 12284416
    Abstract: Described herein is a method for controlling media data playout on a client device, wherein the method includes the steps of: (a) retrieving, by the client device, media data comprising a plurality of segments subdivided into one or more chunks for playout from at least one media server; (b) analyzing a current chunk of the one or more chunks of a current segment; and (c) adapting the playout of the media data in response to the result of the analysis prior to fully retrieving the current chunk. Described herein are further a client device having implemented a media player application configured to perform said method and a computer program product with instructions adapted to cause a device having processing capability to carry out said method.
    Type: Grant
    Filed: February 1, 2021
    Date of Patent: April 22, 2025
    Assignee: Dolby International AB
    Inventor: Jonas Moeller Larsen
  • Publication number: 20250118311
    Abstract: A method for decoding an encoded audio bitstream is disclosed. The method includes receiving the encoded audio bitstream and decoding the audio data to generate a decoded lowband audio signal. The method further includes extracting high frequency reconstruction metadata and filtering the decoded lowband audio signal with an analysis filterbank to generate a filtered lowband audio signal. The method also includes extracting a flag indicating whether either spectral translation or harmonic transposition is to be performed on the audio data and regenerating a highband portion of the audio signal using the filtered lowband audio signal and the high frequency reconstruction metadata in accordance with the flag.
    Type: Application
    Filed: December 16, 2024
    Publication date: April 10, 2025
    Applicant: Dolby International AB
    Inventors: Kristofer Kjoerling, Lars Villemoes, Heiko Purnhagen, Per Ekstrand
  • Publication number: 20250118312
    Abstract: A method for decoding an encoded audio bitstream is disclosed. The method includes receiving the encoded audio bitstream and decoding the audio data to generate a decoded lowband audio signal. The method further includes extracting high frequency reconstruction metadata and filtering the decoded lowband audio signal with an analysis filterbank to generate a filtered lowband audio signal. The method also includes extracting a flag indicating whether either spectral translation or harmonic transposition is to be performed on the audio data and regenerating a highband portion of the audio signal using the filtered lowband audio signal and the high frequency reconstruction metadata in accordance with the flag.
    Type: Application
    Filed: December 16, 2024
    Publication date: April 10, 2025
    Applicant: Dolby International AB
    Inventors: Kristofer Kjoerling, Lars Villemoes, Heiko Purnhagen, Per Ekstrand
  • Publication number: 20250078846
    Abstract: The disclosure relates to a method and device for processing object-based audio and channel-based audio. The method comprises receiving a first frame of audio of a first format; receiving a second frame of audio of a second format different from the first format, the second frame for playback subsequent to the first frame; decoding the first frame of audio into a decoded first frame; decoding the second frame of audio into a decoded second frame; and generating a plurality of output frames of a third format by performing rendering based on the decoded first frame and the decoded second frame. The first format may be an object-based audio format and the second format is a channel-based audio format or vice versa.
    Type: Application
    Filed: July 21, 2022
    Publication date: March 6, 2025
    Applicant: Dolby International AB
    Inventors: Eytan Rubin, Klaus Peichl, Dawid Powazka
  • Patent number: 12245017
    Abstract: Described herein is a method of processing audio content for rendering in a three-dimensional audio scene, wherein the audio content comprises a sound source at a source position, the method comprising: obtaining a voxelized representation of the three-dimensional audio scene, wherein the voxelized representation indicates volume elements in which sound can propagate and volume elements by which sound is occluded; generating a two-dimensional projection map for the audio scene based on the voxelized representation by applying a projection operation to the voxelized representation that projects onto a horizontal plane; and determining parameters indicating a virtual source position of a virtual sound source based on the source position, a listener position, and the projection map, to simulate, by rendering a virtual source signal from the virtual source position, an impact of acoustic diffraction by the three-dimensional audio scene on a source signal of the sound source at the source position.
    Type: Grant
    Filed: March 29, 2021
    Date of Patent: March 4, 2025
    Assignee: Dolby International AB
    Inventors: Leon Terentiv, Daniel Fischer, Christof Fersch, Panji Setiawan
  • Patent number: 12231699
    Abstract: A method for decoding a video bitstream is disclosed. The method comprises: entropy decoding a first portion of a video bitstream, wherein first portion of video bitstream is associated with a video frame, thereby producing a first portion of decoded data; entropy decoding a second portion of video bitstream, wherein second portion of video bitstream is associated with video frame, thereby producing a second portion of decoded data, wherein entropy decoding second portion of video bitstream is independent of entropy decoding first portion of video bitstream; and reconstructing a first portion of video frame associated with video bitstream using first portion of decoded data and second portion of decoded data.
    Type: Grant
    Filed: October 27, 2023
    Date of Patent: February 18, 2025
    Assignee: Dolby International AB
    Inventors: Jie Zhao, Christopher A. Segall, Louis J. Kerofsky
  • Patent number: 12223966
    Abstract: Methods and systems for advanced stereo processing of an audio signal are disclosed. The methods and systems include selecting a coding mode of either transform coding or linear predictive coding and performing advanced stereo processing when in the selected coding mode. Both encoding and decoding operations are provided.
    Type: Grant
    Filed: April 25, 2022
    Date of Patent: February 11, 2025
    Assignee: Dolby International AB
    Inventors: Heiko Purnhagen, Pontus Carlsson, Kristofer Kjoerling
  • Patent number: 12223968
    Abstract: Described herein is a method of encoding an audio signal. The method comprises: generating a plurality of subband audio signals based on the audio signal; determining a spectral envelope of the audio signal; for each subband audio signal, determining autocorrelation information for the subband audio signal based on an autocorrelation function of the subband audio signal; and generating an encoded representation of the audio signal, the encoded representation comprising a representation of the spectral envelope of the audio signal and a representation of the autocorrelation information for the plurality of subband audio signals. Further described are methods of decoding the audio signal from the encoded representation, as well as corresponding encoders, decoders, computer programs, and computer-readable recording media.
    Type: Grant
    Filed: August 18, 2020
    Date of Patent: February 11, 2025
    Assignee: Dolby International AB
    Inventors: Lars Villemoes, Heidi-Maria Lehtonen, Heiko Purnhagen, Per Hedelin
  • Patent number: 12212953
    Abstract: Diffuse or spatially large audio objects may be identified for special processing. A decorrelation process may be performed on audio signals corresponding to the large audio objects to produce decorrelated large audio object audio signals. These decorrelated large audio object audio signals may be associated with object locations, which may be stationary or time-varying locations. For example, the decorrelated large audio object audio signals may be rendered to virtual or actual speaker locations. The output of such a rendering process may be input to a scene simplification process. The decorrelation, associating and/or scene simplification processes may be performed prior to a process of encoding the audio data.
    Type: Grant
    Filed: July 10, 2023
    Date of Patent: January 28, 2025
    Assignees: Dolby Laboratories Licensing Corporation, Dolby International AB
    Inventors: Dirk Jeroen Breebaart, Lie Lu, Nicolas R. Tsingos, Antonio Mateos Sole
  • Patent number: 12205581
    Abstract: The present disclosure relates to methods for processing a decoded audio signal and for selectively applying speech/dialog enhancement to the decoded audio signal. The present disclosure also relates to a method of operating a headset for computer-mediated reality. A method of processing a decoded audio signal comprises obtaining a measure of a cognitive load of a listener that listens to a rendering of the audio signal, determining whether speech/dialog enhancement shall be applied based on the obtained measure of the cognitive load, and performing speech/dialog enhancement based on the determination. A method of operating a headset for computer-mediated reality comprises obtaining eye-tracking data of a wearer of the headset, determining a measure of a cognitive load of the wearer of the headset based on the eye-tracking data, and outputting an indication of the cognitive load of the wearer of the headset.
    Type: Grant
    Filed: March 25, 2021
    Date of Patent: January 21, 2025
    Assignee: Dolby International AB
    Inventor: Arijit Biswas
  • Patent number: 12205607
    Abstract: Described herein is a method for generating a modified bitstream on a source device, wherein the method includes the steps of: a) receiving, by a receiver, a bitstream including coded media data; b) generating, by an embedder, payload of additional media data and embedding the payload in the bitstream for obtaining, as an output from the embedder, a modified bitstream including the coded media data and the payload of the additional media data; and d) outputting the modified bitstream to a sink device. Described is further a method for processing said modified bitstream on a sink device. Described are moreover a respective source device and sink device as well as a system of a source device and a sink device and respective computer program products.
    Type: Grant
    Filed: August 13, 2020
    Date of Patent: January 21, 2025
    Assignees: Dolby Laboratories Licensing Corporation, Dolby International AB
    Inventors: Christof Fersch, Daniel Fischer, Leon Terentiv, Gregory John McGarry
  • Patent number: 12205602
    Abstract: A method for decoding an encoded audio bitstream is disclosed. The method includes receiving the encoded audio bitstream and decoding the audio data to generate a decoded lowband audio signal. The method further includes extracting high frequency reconstruction metadata and filtering the decoded lowband audio signal with an analysis filterbank to generate a filtered lowband audio signal. The method also includes extracting a flag indicating whether either spectral translation or harmonic transposition is to be performed on the audio data and regenerating a highband portion of the audio signal using the filtered lowband audio signal and the high frequency reconstruction metadata in accordance with the flag.
    Type: Grant
    Filed: March 11, 2024
    Date of Patent: January 21, 2025
    Assignee: Dolby International AB
    Inventors: Kristofer Kjoerling, Lars Villemoes, Heiko Purnhagen, Per Ekstrand
  • Patent number: 12170875
    Abstract: A multi-stream rendering system and method may render and play simultaneously a plurality of audio program streams over a plurality of arbitrarily placed loudspeakers. At least one of the program streams may be a spatial mix. The rendering of said spatial mix may be dynamically modified as a function of the simultaneous rendering of one or more additional program streams. The rendering of one or more additional program streams may be dynamically modified as a function of the simultaneous rendering of the spatial mix.
    Type: Grant
    Filed: July 27, 2020
    Date of Patent: December 17, 2024
    Assignees: Dolby Laboratories Licensing Corporation, Dolby International AB
    Inventors: Alan J. Seefeldt, Joshua B. Lando, Daniel Arteaga, Mark R. P Thomas, Glenn N. Dickins
  • Patent number: D1058001
    Type: Grant
    Filed: July 1, 2021
    Date of Patent: January 14, 2025
    Assignees: Dolby Laboratories Licensing Corporation, Dolby International AB
    Inventors: Paul Arnulf Frick, Matthew William Clare, Xiaoxi Zhang, Rui Bao, Yifan Wu, Giovanna Bucchiarone, Brent Warren Behringer, Pascal Sijen, Douglas J. Gorny, Gilbert K. Lee, Christopher R. Kukshtel, Peter Michaelian, Su Jiao