Dolby Labs Patents

Dolby Laboratories, Inc. licenses its audio technologies, including its noise-reduction systems, to the media industry. Its product portfolio includes Dolby Digital Plus (DD+), Dolby Digital (DD), AAC and HE-AAC, Dolby TrueHD, Dolby Atmos, Dolby AC-4, Dolby Voice and Dolby Vision. Products that incorporate Dolby technologies include televisions, set-top boxes, computers, DVD and Blu-ray devices, soundbars, smartphones, tablets, video game consoles, and automobile entertainment systems.

Dolby Labs Patents by Type

  • Patent number: 9990934
    Abstract: Higher Order Ambisonics represents three-dimensional sound independent of a specific loudspeaker set-up. However, transmission of an HOA representation results in a very high bit rate. Therefore compression with a fixed number of channels is used, in which directional and ambient signal components are processed differently. For coding, portions of the original HOA representation are predicted from the directional signal components. This prediction provides side information which is required for a corresponding decoding. By using some additional specific purpose bits, a known side information coding processing is improved in that the required number of bits for coding that side information is reduced on average.
    Type: Grant
    Filed: December 19, 2014
    Date of Patent: June 5, 2018
    Assignee: Dolby Laboratories Licensing Corporation
    Inventors: Alexander Krueger, Sven Kordon, Oliver Wuebbolt
  • Patent number: 9992507
    Abstract: Methods for decoding a video bitstream. One of the methods includes receiving a respective buffer description for each of one or more decoded reference pictures from the video bitstream; wherein the respective buffer descriptions include a poc cycle parameter for one or more long term reference pictures in the one or more decoded reference pictures, and wherein the poc cycle parameter is used to calculate a picture order count (POC) for the decoded long term reference pictures; identifying one or more decoded reference pictures for a current picture from a decoded picture buffer, based on the POC for the decoded long term reference pictures; decoding the current picture using inter-frame prediction based on the identified one or more decoded reference pictures; and buffering the decoded picture in the decoded picture buffer.
    Type: Grant
    Filed: May 21, 2014
    Date of Patent: June 5, 2018
    Assignee: Dolby International AB
    Inventors: Kiran Misra, Sachin G. Deshpande, Christopher A. Segall
  • Patent number: 9992476
    Abstract: Stereoscopic images are subsampled and placed in a “checkerboard” pattern in an image. The image is encoded in a monoscopic video format. The monoscopic video is transmitted to a device where the “checkerboard” is decoded. Portions of the checkerboard (e.g., “black” portions) are used to reconstruct one of the stereoscopic images and the other portion of the checkerboard (e.g., “white” portions) are used to reconstruct the other image. The subsamples are, for example, taken from the image in a location coincident to the checkerboard position in which the subsamples are encoded.
    Type: Grant
    Filed: January 22, 2018
    Date of Patent: June 5, 2018
    Assignee: Dolby Laboratories Licensing Corporation
    Inventors: Walter J. Husak, David Ruhoff, Alexandros Tourapis, Athanasios Leontaris
  • Patent number: 9990749
    Abstract: Systems and methods for perceptually synchronizing at least one secondary display that is in a same visual environment as a primary display. The image appearance parameters may be derived from the image/video shown on the primary display can be used to map the appearance of any arbitrary content on a secondary device. To produce a visually pleasing environment for a viewer in the visual environment, systems and methods are herein disclosed for synchronizing the display settings or parameters. The synchronization may be affected by dynamically adjusting the image data rendered upon one of the primary and/or secondary displays. Such dynamic adjustments may be made in accordance with the characteristics of the primary display and/or secondary display. Such adjustments may be made to the dynamic range, color mapping, etc. of the rendering on either display.
    Type: Grant
    Filed: February 19, 2014
    Date of Patent: June 5, 2018
    Assignee: Dolby Laboratories Licensing Corporation
    Inventor: Timo Kunkel
  • Patent number: 9990935
    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: Grant
    Filed: September 10, 2014
    Date of Patent: June 5, 2018
    Assignees: Dolby Laboratories Licensing Corporation, Dolby International AB
    Inventors: Alexander Groeschel, Jens Popp, Martin Wolters, Jeffrey Riedmiller, Michael Ward, Karl Jonas Roeden, Holger Hoerich, Karsten Linzmeier, Tobias Friedrich
  • Publication number: 20180151170
    Abstract: The disclosure relates to combined active noise cancellation and noise compensation in a headphone. An audio processing device includes a selector and a noise compensation unit. The selector can select one of a plurality of first transfer functions based on at least one feature of at least one of an external noise and a content audio signal representing a sound to be reproduced through the headphone. The noise compensation unit can compute a second audio signal by applying the selected first transfer function to a first audio signal, and derive gains for the noise compensation at least based on the second audio signal. The at least one feature can be used to distinguish at least two of the first transfer functions. Each of the first transfer functions can transform the first audio signal to the second audio signal which is assumed as representing a version of the sound represented by the first audio signal, which arrives at an eardrum of a listener wearing the headphone.
    Type: Application
    Filed: January 23, 2018
    Publication date: May 31, 2018
    Applicant: Dolby Laboratories Licensing Corporation
    Inventors: Guilin MA, Xiguang ZHENG
  • Publication number: 20180151188
    Abstract: Apparatus and methods for generating an encoded audio bitstream, including by including program loudness metadata and audio data in the bitstream, and optionally also program boundary metadata in at least one segment (e.g., frame) of the bitstream. Other aspects are apparatus and methods for decoding such a bitstream, e.g., including by performing adaptive loudness processing of the audio data of an audio program indicated by the bitstream, or authentication and/or validation of metadata and/or audio data of such an audio program. Another aspect is an audio processing unit (e.g., an encoder, decoder, or post-processor) configured (e.g., programmed) to perform any embodiment of the method or which includes a buffer memory which stores at least one frame of an audio bitstream generated in accordance with any embodiment of the method.
    Type: Application
    Filed: January 23, 2018
    Publication date: May 31, 2018
    Applicant: DOLBY LABORATORIES LICENSING CORPORATION
    Inventors: Michael GRANT, Scott Gregory NORCROSS, Jeffrey RIEDMILLER, Michael WARD
  • Publication number: 20180152678
    Abstract: Dual or multi-modulation display systems comprising a first modulator and a second modulator are disclosed. The first modulator may comprise a plurality of analog mirrors (e.g. MEMS array) and the second modulator may comprise a plurality of mirrors (e.g., DMD array). The display system may further comprise a controller that sends control signals to the first and second modulator. The display system may render highlight features within a projected image by affecting a time multiplexing scheme. In one embodiment, the first modulator may be switched on a sub-frame basis such that a desired proportion of the available light may be focused or directed onto the second modulator to form the highlight feature on a sub-frame rendering basis.
    Type: Application
    Filed: January 25, 2018
    Publication date: May 31, 2018
    Applicant: Dolby Laboratories Licensing Corporation
    Inventor: Martin J. Richards
  • Publication number: 20180152719
    Abstract: Implementations are provided that relate, for example, to view tiling in video encoding and decoding. A particular method includes accessing a video picture that includes multiple pictures combined into a single picture (826), accessing information indicating how the multiple pictures in the accessed video picture are combined (806, 808, 822), decoding the video picture to provide a decoded representation of at least one of the multiple pictures (824, 826), and providing the accessed information and the decoded video picture as output (824, 826). Some other implementations format or process the information that indicates how multiple pictures included in a single video picture are combined into the single video picture, and format or process an encoded representation of the combined multiple pictures.
    Type: Application
    Filed: January 24, 2018
    Publication date: May 31, 2018
    Applicant: DOLBY LABORATORIES LICENSING CORPORATION
    Inventors: Purvin Bibhas PANDIT, Peng YIN, Dong TIAN
  • Publication number: 20180151186
    Abstract: Methods and audio processing units for generating an object based audio program including conditional rendering metadata corresponding to at least one object channel of the program, where the conditional rendering metadata is indicative of at least one rendering constraint, based on playback speaker array configuration, which applies to each corresponding object channel, and methods for rendering audio content determined by such a program, including by rendering content of at least one audio channel of the program in a manner compliant with each applicable rendering constraint in response to at least some of the conditional rendering metadata. Rendering of a selected mix of content of the program may provide an immersive experience.
    Type: Application
    Filed: January 29, 2018
    Publication date: May 31, 2018
    Applicants: Dolby Laboratories Licensing Corporation, DOLBY INTERNATIONAL AB
    Inventors: Sripal S. MEHTA, Thomas ZIEGLER, Stewart MURRIE
  • Publication number: 20180151189
    Abstract: On the basis of a bitstream (P), an n-channel audio signal (X) is reconstructed by deriving an m-channel core signal (Y) and multichannel coding parameters (?) from the bitstream, where 1?m<n. Also derived from the bitstream are pre-processing dynamic range control, DRC, parameters (DRC2) quantifying an encoder-side dynamic range limiting of the core signal. The n-channel audio signal is obtained by parametric synthesis in accordance with the multichannel coding parameters and while cancelling any encoder-side dynamic range limiting based on the pre-processing DRC parameters. In particular embodiments, the reconstruction further includes use of compensated post-processing DRC parameters quantifying a potential decoder-side dynamic range compression. Cancellation of an encoder-side range limitation and range compression are preferably performed by different decoder-side components. Cancellation and compression may be coordinated by a DRC pre-processor.
    Type: Application
    Filed: January 26, 2018
    Publication date: May 31, 2018
    Applicants: DOLBY LABORATORIES LICENSING CORPORATION, DOLBY INTERNATIONAL AB
    Inventors: Jeffrey RIEDMILLER, Karl J. ROEDEN, Kristofer KJOERLING, Heiko PURNHAGEN, Vinay MELKOTE, Leif SEHLSTROM
  • Publication number: 20180152803
    Abstract: An audio processing system and method which calculates, based on spatial metadata of the audio object, a panning coefficient for each of the audio objects in relation to each of a plurality of predefined channel coverage zones. Converts the audio signal into submixes in relation to the predefined channel coverage zones based on the calculated panning coefficients and the audio objects. Each of the submixes indicating a sum of components of the plurality of the audio objects in relation to one of the predefined channel coverage zones. Generating a submix gain by applying an audio processing to each of the submix and controls an object gain applied to each of the audio objects. The object gain being as a function of the panning coefficients for each of the audio objects and the submix gains in relation to each of the predefined channel coverage zones.
    Type: Application
    Filed: May 26, 2016
    Publication date: May 31, 2018
    Applicant: DOLBY LABORATORIES LICENSING CORPORATION
    Inventors: Alan J. SEEFELDT, Lie LU, Chen ZHANG
  • Patent number: 9986249
    Abstract: Methods, systems, and computer programs for improving compressed image chroma information. In one aspect of the invention, a resolution for a red color component of a color video image is used that is higher than the resolution for a blue color component of the color video image. Another aspect includes utilizing a lower or higher value of a quantization parameter (QP) for one or more chroma channels as compared to the luminance channel. Another aspect is use of a logarithmic representation of a video image to benefit image coding. Another aspect uses more than two chroma channels to represent a video image.
    Type: Grant
    Filed: October 13, 2011
    Date of Patent: May 29, 2018
    Assignee: Dolby Laboratories Licensing Corporation
    Inventor: Gary A. Demos
  • Patent number: 9986338
    Abstract: Embodiments are directed to speakers and circuits that reflect sound off a wall surface (114) to a listening location at a distance from a speaker. The reflected sound (103) provides direct audio cues to reproduce audio objects that have direct audio components without the need for direct firing speakers. The speaker comprises sideward firing drivers (108) to reflect sound off of the wall surface (114) and represents a virtual direct speaker (116). A virtual direct filter is applied to the sideward-firing driver signal to improve the perception of direct audio transmitted by the sideward firing speaker (108) to provide optimum reproduction of the reflected sound. The virtual direct filter may be incorporated as part of a crossover circuit that separates the full band and sends high frequency sound to the sideward-firing driver (108).
    Type: Grant
    Filed: January 6, 2015
    Date of Patent: May 29, 2018
    Assignee: Dolby Laboratories Licensing Corporation
    Inventors: Warren Mansfield, Eugene Edward Radzik, Alan J. Seefeldt, Jared Smith, C. Phillip Brown, Michael Smithers
  • Patent number: 9984694
    Abstract: Conventional audio compression technologies perform a standardized signal transformation, independent of the type of the content. Multi-channel signals are decomposed into their signal components, subsequently quantized and encoded. This is disadvantageous due to lack of knowledge on the characteristics of scene composition, especially for e.g. multi-channel audio or Higher-Order Ambisonics (HOA) content. An improved method for encoding pre-processed audio data comprises encoding the pre-processed audio data, and encoding auxiliary data that indicate the particular audio pre-processing. An improved method for decoding encoded audio data comprises determining that the encoded audio data had been pre-processed before encoding, decoding the audio data, extracting from received data information about the pre-processing, and post-processing the decoded audio data according to the extracted pre-processing information.
    Type: Grant
    Filed: January 27, 2017
    Date of Patent: May 29, 2018
    Assignee: Dolby Laboratories Licensing Corporation
    Inventors: Oliver Wuebbolt, Johannes Boehm, Peter Jax
  • Patent number: 9986254
    Abstract: Implementations are provided that relate, for example, to view tiling in video encoding and decoding. A particular method includes accessing a video picture that includes multiple pictures combined into a single picture (826), accessing information indicating how the multiple pictures in the accessed video picture are combined (806, 808, 822), decoding the video picture to provide a decoded representation of at least one of the multiple pictures (824, 826), and providing the accessed information and the decoded video picture as output (824, 826). Some other implementations format or process the information that indicates how multiple pictures included in a single video picture are combined into the single video picture, and format or process an encoded representation of the combined multiple pictures.
    Type: Grant
    Filed: January 24, 2018
    Date of Patent: May 29, 2018
    Assignee: Dolby Laboratories Licensing Corporation
    Inventors: Purvin Bibhas Pandit, Peng Yin, Dong Tian
  • Patent number: 9983545
    Abstract: Dual or multi-modulation display system are disclosed that comprise projector systems with at least one modulator that may employ non-mechanical beam steering modulation. Many embodiments disclosed herein employ a non-mechanical beam steering and/or polarizer to provide for a highlights modulator.
    Type: Grant
    Filed: July 28, 2014
    Date of Patent: May 29, 2018
    Assignee: Dolby Laboratories Licensing Corporation
    Inventors: Douglas J. Gorny, Martin J. Richards
  • Patent number: 9985855
    Abstract: Described are: a method, an apparatus, and a tangible computer-readable storage medium comprising instructions to instruct one or more processors to carry out a method. One set of methods is for the transmit side of a communication link and another set of methods is for the receive side. A transmit side method includes assigning one of a set of classifications to media, e.g., voice/audio packets transmitted in a sequence, different classifications impacting differently a measure of perceptual quality calculated at the receive side if packets of the respective classifications are lost. A present packet is sent to the receive side containing the classification of a previous packet.
    Type: Grant
    Filed: June 26, 2013
    Date of Patent: May 29, 2018
    Assignee: Dolby Laboratories Licensing Corporation
    Inventors: Glenn N. Dickins, Hannes Muesch
  • Patent number: 9984695
    Abstract: The present document relates to the technical field of audio coding, decoding and processing. It specifically relates to methods of recovering high frequency content of an audio signal from low frequency content of the same audio signal in an efficient manner. A method for determining a first banded tonality value for a first frequency subband of an audio signal is described. The first banded tonality value is used for approximating a high frequency component of the audio signal based on a low frequency component of the audio signal.
    Type: Grant
    Filed: April 21, 2017
    Date of Patent: May 29, 2018
    Assignee: Dolby International AB
    Inventors: Robin Thesing, Michael Schug
  • Publication number: 20180146176
    Abstract: Apparatus for controlling a spatial light modulator (106) of an image projector (100), the image projector further comprising an illumination source (102) arranged to illuminate the spatial light modulator (106), the apparatus comprising an input (126) for receiving image data, an output for outputting image data and a controller (110) in communication with the input and the output, the controller (110) being configured to: •determine an estimated thermal state of the projector; •use at least the estimated thermal state of the projector to obtain an expected illumination pattern of light incident on the spatial light modulator (106) when illuminated by the illumination source (102); •use the expected illumination pattern to adjust the received image data so as to compensate for thermal changes in one or more components of the image projector; and •output the adjusted image data to the spatial light modulator (106).
    Type: Application
    Filed: May 6, 2016
    Publication date: May 24, 2018
    Applicant: Dolby Laboratories Licensing Corporation
    Inventors: Christopher John ORLICK, Jerome D. SHIELDS
  • Publication number: 20180144753
    Abstract: The application relates to HFR (High Frequency Reconstruction/Regeneration) of audio signals. In particular, the application relates to a method and system for performing HFR of audio signals having large variations in energy level across the low frequency range which is used to reconstruct the high frequencies of the audio signal. A system configured to generate a plurality of high frequency subband signals covering a high frequency interval from a plurality of low frequency subband signals is described.
    Type: Application
    Filed: January 16, 2018
    Publication date: May 24, 2018
    Applicant: Dolby International AB
    Inventor: Kristofer Kjoerling
  • Publication number: 20180144751
    Abstract: The application relates to audio encoder and decoder systems. An embodiment of the encoder system comprises a downmix stage for generating a downmix signal and a residual signal based on a stereo signal. In addition, the encoder system comprises a parameter determining stage for determining parametric stereo parameters such as an inter-channel intensity difference and an inter-channel cross-correlation. Preferably, the parametric stereo parameters are time- and frequency-variant. Moreover, the encoder system comprises a transform stage. The transform stage generates a pseudo left/right stereo signal by performing a transform based on the downmix signal and the residual signal. The pseudo stereo signal is processed by a perceptual stereo encoder. For stereo encoding, left/right encoding or mid/side encoding is selectable. Preferably, the selection between left/right stereo encoding and mid/side stereo encoding is time- and frequency-variant.
    Type: Application
    Filed: January 17, 2018
    Publication date: May 24, 2018
    Applicant: Dolby International AB
    Inventors: Heiko Purnhagen, Pontus Carlsson, Kristofer Kjoerling
  • Publication number: 20180144692
    Abstract: Systems and methods are disclosed for filtering metadata to be used in display management. Given an input video stream and input metadata comprising at least one of minimum, average, or maximum luminance values of the video frames in the video stream, values of a function of the input metadata are filtered using a temporal filter to generate filtered metadata, wherein the filtering is based only on metadata for input frames in the same scene. Methods for temporal filtering based on an exponential moving average filter or a look-ahead sliding window filter are presented, including methods for scene-change detection using the input metadata.
    Type: Application
    Filed: May 11, 2016
    Publication date: May 24, 2018
    Applicant: DOLBY LABORATORIES LICENSING CORPORATION
    Inventors: Robin ATKINS, Gregory John WARD, Samir N. HULYALKAR, Guan-Ming SU, Sheng QU
  • Publication number: 20180146185
    Abstract: Stereoscopic images are subsampled and placed in a “checkerboard” pattern in an image. The image is encoded in a monoscopic video format. The monoscopic video is transmitted to a device where the “checkerboard” is decoded. Portions of the checkerboard (e.g., “black” portions) are used to reconstruct one of the stereoscopic images and the other portion of the checkerboard (e.g., “white” portions) are used to reconstruct the other image. The subsamples are, for example, taken from the image in a location coincident to the checkerboard position in which the subsamples are encoded.
    Type: Application
    Filed: January 22, 2018
    Publication date: May 24, 2018
    Applicant: Dolby Laboratories Licensing Corporation
    Inventors: Walter J. Husak, David Ruhoff, Alexandros Tourapis, Athanasios Leontaris
  • Publication number: 20180146198
    Abstract: Video images are rendered in viewports of content viewers. Each content viewer views video images through a respective viewport in the viewports. Spatial locations in the video images to which foveal visions of the content viewers are directed are determined. ROIs in the video images are identified based on the spatial locations in the video images.
    Type: Application
    Filed: November 17, 2017
    Publication date: May 24, 2018
    Applicant: Dolby Laboratories Licensing Corporation
    Inventors: Chaitanya ATLURU, Ajit NINAN
  • Publication number: 20180146315
    Abstract: Higher Order Ambisonics represents three-dimensional sound independent of a specific loudspeaker set-up. However, transmission of an HOA representation results in a very high bit rate. Therefore compression with a fixed number of channels is used, in which directional and ambient signal components are processed differently. The ambient HOA component is represented by a minimum number of HOA coefficient sequences. The remaining channels contain either directional signals or additional coefficient sequences of the ambient HOA component, depending on what will result in optimum perceptual quality. This processing can change on a frame-by-frame basis.
    Type: Application
    Filed: January 22, 2018
    Publication date: May 24, 2018
    Applicant: DOLBY LABORATORIES LICENSING CORPORATION
    Inventors: SVEN KORDON, ALEXANDER KRUEGER
  • Publication number: 20180144759
    Abstract: Example embodiments disclosed herein relate to audio source separation with source direction determined based on iterative weighted component analysis. A method of separating audio sources in audio content is disclosed. The audio content includes a plurality of channels. The method includes obtaining multiple data samples from multiple time-frequency tiles of the audio content. The method also includes analyzing the data samples to generate multiple components in a plurality of iterations, wherein each of the components indicates a direction with a variance of the data samples, and wherein in each of the plurality of iterations, each of the data samples is weighted with a weight that is determined based on a selected component from the multiple components. The method further includes determining a source direction of the audio content based on the selected component for separating an audio source from the audio content.
    Type: Application
    Filed: May 12, 2016
    Publication date: May 24, 2018
    Applicant: DOLBY LABORATORIES LICENSING CORPORATION
    Inventors: Lie LU, Mingqing HU
  • Publication number: 20180146288
    Abstract: An apparatus and method are disclosed for processing an audio signal. The apparatus includes an input interface, a digital filterbank having an analysis part and a synthesis part, a first phase shifter, a spectral envelope adjuster, a second phase shifter, and an output interface. The first phase shifter and the second phase shifter reduce a complexity of the digital filterbank, which includes both analysis and synthesis filters that are complex-exponential modulated versions of a prototype filter.
    Type: Application
    Filed: January 22, 2018
    Publication date: May 24, 2018
    Applicant: Dolby International AB
    Inventor: Per Ekstrand
  • Patent number: 9979369
    Abstract: An audio peak limiter apparatus which calculates a smoothed sequence of gains for application to a sequence of blocks of samples of an audio signal. The apparatus sometimes calculates a candidate gain, to replace a too-large smoothed gain, such that applying the candidate gain would produce no scaled sample whose magnitude exceeds a predetermined limit. The apparatus sometimes calculates and stores a final gain to replace the too-large smoothed gain (where the final gain can be obtained e.g. by dividing the to-be-replaced smoothed gain by a prior smoothed gain and multiplying the result by the corresponding prior final gain), if it is determined that the candidate gain is not less than the immediately previous final gain.
    Type: Grant
    Filed: October 19, 2017
    Date of Patent: May 22, 2018
    Assignee: Dolby Laboratories Licensing Corporation
    Inventors: Nicholas Luke Appleton, Christopher Mark Tubb, William Thomas Rowley, Imankalyan Mukherjee
  • Patent number: 9979963
    Abstract: Embodiments of the present invention relate to methods and systems for ordering, communicating and applying pixel intra-prediction modes.
    Type: Grant
    Filed: February 1, 2016
    Date of Patent: May 22, 2018
    Assignee: Dolby Laboratories Licensing Corporation
    Inventors: Shijun Sun, Louis J. Kerofsky
  • Patent number: 9979829
    Abstract: Embodiments are described for a soundfield system that receives a transmitting soundfield, wherein the transmitting soundfield includes a sound source at a location in the transmitting soundfield. The system determines a rotation angle for rotating the transmitting soundfield based on a desired location for the sound source. The transmitting soundfield is rotated by the determined angle and the system obtains a listener's soundfield based on the rotated transmitting soundfield. The listener's soundfield is transmitted for rendering to a listener.
    Type: Grant
    Filed: March 13, 2014
    Date of Patent: May 22, 2018
    Assignee: Dolby Laboratories Licensing Corporation
    Inventor: Richard J. Cartwright
  • Patent number: 9978385
    Abstract: An encoding system (400) encodes an N-channel audio signal (X), wherein N?3, as a single-channel downmix signal (Y) together with dry and wet upmix parameters (C, P). In a decoding system (200), a decorrelating section (101) outputs, based on the downmix signal, an (N?1)-channel decorrelated signal (Z); a dry upmix section (102) maps the downmix signal linearly in accordance with dry upmix coefficients (C) determined based on the dry upmix parameters; a wet upmix section (103) populates an intermediate matrix based on the wet upmix parameters and knowing that the intermediate matrix belongs to a predefined matrix class, obtains wet upmix coefficients (P) by multiplying the intermediate matrix by a predefined matrix, and maps the decorrelated signal linearly in accordance with the wet upmix coefficients; and a combining section (104) combines outputs from the upmix sections to obtain a reconstructed signal (X) corresponding to the signal to be reconstructed.
    Type: Grant
    Filed: October 21, 2014
    Date of Patent: May 22, 2018
    Assignee: Dolby International AB
    Inventors: Lars Villemoes, Heidi-Maria Lehtonen, Heiko Purnhagen, Toni Hirvonen
  • Patent number: 9979366
    Abstract: The invention relates to the measurement and control of the perceived sound loudness and/or the perceived spectral balance of an audio signal. An audio signal is modified in response to calculations performed at least in part in the perceptual (psychoacoustic) loudness domain. The invention is useful, for example, in one or more of: loudness-compensating volume control, automatic gain control, dynamic range control (including, for example, limiters, compressors, expanders, etc.), dynamic equalization, and compensating for background noise interference in an audio playback environment. The invention includes not only methods but also corresponding computer programs and apparatus.
    Type: Grant
    Filed: August 9, 2017
    Date of Patent: May 22, 2018
    Assignee: Dolby Laboratories Licensing Corporation
    Inventor: Alan Jeffrey Seefedlt
  • Patent number: 9980073
    Abstract: A method and apparatus for decompressing a Higher Order Ambisonics (HOA) signal representation is disclosed. The apparatus includes an input interface that receives an encoded directional signal and an encoded ambient signal and an audio decoder that perceptually decodes the encoded directional signal and encoded ambient signal to produce a decoded directional signal and a decoded ambient signal, respectively. The apparatus further includes an extractor for obtaining side information related to the directional signal and an inverse transformer for converting the decoded ambient signal from a spatial domain to an HOA domain representation of the ambient signal. The apparatus also includes a synthesizer for recomposing a Higher Order Ambisonics (HOA) signal from the HOA domain representation of the ambient signal and the decoded directional signal. The side information includes a direction of the directional signal selected from a set of uniformly spaced directions.
    Type: Grant
    Filed: July 27, 2016
    Date of Patent: May 22, 2018
    Assignee: Dolby Laboratories Licensing Corporation
    Inventors: Alexander Krüger, Sven Kordon, Johannes Boehm, Johann-Markus Batke
  • Publication number: 20180139535
    Abstract: Methods and systems for generating an audio mix indicative of action sound captured at an event on a surface (e.g., a sporting event on a field) using a microphone array, where the array includes subsurface microphones (e.g., a large number of sub-surface microphones) positioned under the surface, and optionally also other microphones. In typical embodiments, at least one point of interest (“PI”) on the surface is selected in an automated manner, PI data indicative of a currently selected PI on the surface is generated (e.g., a sequence of PIs on the surface is selected, the PI data is indicative of the sequence of PIs, and a most recently selected PI in the sequence is the currently selected PI), and the audio mix is generated in response to the PI data. Aspects include methods performed by any embodiment of the system, and a system or device configured (e.g., programmed) to perform any embodiment of the method.
    Type: Application
    Filed: April 8, 2016
    Publication date: May 17, 2018
    Applicants: Dolby Laboratories Licensing Corporation, Dolby International AB
    Inventors: Giulio CENGARLE, Antonio MATEOS SOLE, Natanael David OLAIZ, Kenneth Robert HONOLD
  • Publication number: 20180137866
    Abstract: The invention provides methods and devices for stereo encoding and decoding using complex prediction in the frequency domain. In one embodiment, a decoding method, for obtaining an output stereo signal from an input stereo signal encoded by complex prediction coding and comprising first frequency-domain representations of two input channels, comprises the upmixing steps of: (i) computing a second frequency-domain representation of a first input channel; and (ii) computing an output channel on the basis of the first and second frequency-domain representations of the first input channel, the first frequency-domain representation of the second input channel and a complex prediction coefficient. The upmixing can be suspended responsive to control data.
    Type: Application
    Filed: December 20, 2017
    Publication date: May 17, 2018
    Applicant: DOLBY INTERNATIONAL AB
    Inventors: Heiko Purnhagen, Pontus Carlsson, Lars Villemoes
  • Publication number: 20180137867
    Abstract: The invention provides methods and devices for stereo encoding and decoding using complex prediction in the frequency domain. In one embodiment, a decoding method, for obtaining an output stereo signal from an input stereo signal encoded by complex prediction coding and comprising first frequency-domain representations of two input channels, comprises the upmixing steps of: (i) computing a second frequency-domain representation of a first input channel; and (ii) computing an output channel on the basis of the first and second frequency-domain representations of the first input channel, the first frequency-domain representation of the second input channel and a complex prediction coefficient. The upmixing can be suspended responsive to control data.
    Type: Application
    Filed: December 20, 2017
    Publication date: May 17, 2018
    Applicant: DOLBY INTERNATIONAL AB
    Inventors: Heiko Purnhagen, Pontus Carlsson, Lars Villemoes
  • Publication number: 20180139558
    Abstract: A multi-channel decoder for generating a binaural signal from a downmix signal using upmix rule information on an energy-error introducing upmix rule for calculating a gain factor based on the upmix rule information and characteristics of head related transfer function based filters corresponding to upmix channels. The one or more gain factors are used by a filter processor for filtering the downmix signal so that an energy corrected binaural signal having a left binaural channel and a right binaural channel is obtained.
    Type: Application
    Filed: December 20, 2017
    Publication date: May 17, 2018
    Applicant: DOLBY INTERNATIONAL AB
    Inventor: Lars VILLEMOES
  • Publication number: 20180137868
    Abstract: The invention provides methods and devices for stereo encoding and decoding using complex prediction in the frequency domain. In one embodiment, a decoding method, for obtaining an output stereo signal from an input stereo signal encoded by complex prediction coding and comprising first frequency-domain representations of two input channels, comprises the upmixing steps of: (i) computing a second frequency-domain representation of a first input channel; and (ii) computing an output channel on the basis of the first and second frequency-domain representations of the first input channel, the first frequency-domain representation of the second input channel and a complex prediction coefficient. The upmixing can be suspended responsive to control data.
    Type: Application
    Filed: December 20, 2017
    Publication date: May 17, 2018
    Applicant: DOLBY INTERNATIONAL AB
    Inventors: Heiko Purnhagen, Pontus Carlsson, Lars Villemoes
  • Publication number: 20180139537
    Abstract: Example embodiments disclosed herein relate to separated audio analysis and processing. A system for processing an audio signal is disclosed. The system includes an audio analysis module configured to analyze an input audio signal to determine a processing parameter for the input audio signal, the input audio signal being represented in time domain. The system also includes an audio processing module configured to process the input audio signal in parallel with the audio analysis module. The audio processing module includes a time domain filter configured to filter the input audio signal to obtain an output audio signal in the time domain, and a filter controller configured to control a filter coefficient of the time domain filter based on the processing parameter determined by the audio analysis module. Corresponding method and computer program product of processing an audio signal are also disclosed.
    Type: Application
    Filed: May 26, 2016
    Publication date: May 17, 2018
    Applicant: Dolby Laboratories Licensing Corporation
    Inventors: Dong SHI, Xuejing SUN
  • Publication number: 20180139559
    Abstract: A multi-channel decoder for generating a binaural signal from a downmix signal using upmix rule information on an energy-error introducing upmix rule for calculating a gain factor based on the upmix rule information and characteristics of head related transfer function based filters corresponding to upmix channels. The one or more gain factors are used by a filter processor for filtering the downmix signal so that an energy corrected binaural signal having a left binaural channel and a right binaural channel is obtained.
    Type: Application
    Filed: December 20, 2017
    Publication date: May 17, 2018
    Applicant: DOLBY INTERNATIONAL AB
    Inventor: Lars VILLEMOES
  • Publication number: 20180139566
    Abstract: Some implementations may involve receiving, via an interface system, personnel location data indicating a location of at least one person and receiving, from an orientation system, headset orientation data corresponding with the orientation of a headset. First environmental element location data, indicating a location of at least a first environmental element, may be determined. Based at least in part on the headset orientation data, the personnel location data and the first environmental element location data, headset coordinate locations of at least one person and at least the first environmental element in a headset coordinate system corresponding with the orientation of the headset may be determined. An apparatus may be caused to provide spatialization indications of the headset coordinate locations. Providing the spatialization indications may involve controlling a speaker system to provide environmental element sonification corresponding with at least the first environmental element location data.
    Type: Application
    Filed: April 22, 2016
    Publication date: May 17, 2018
    Applicant: Dolby Laboratories Licensing Corporation
    Inventor: Poppy Anne Carrie CRUM
  • Patent number: 9973208
    Abstract: A method and a device for arithmetic encoding of a current spectral coefficient using preceding spectral coefficients. The method comprises processing the preceding spectral coefficients, using the processed preceding spectral coefficients for determining a context class being one of at least two different context classes, using the determined context class and a mapping from the at least two different context classes to at least two different probability density functions for determining the probability density function, and arithmetic encoding the current spectral coefficient based on the determined probability density function wherein processing the preceding spectral coefficients comprises non-uniformly quantizing absolutes of the preceding spectral coefficients for use in determining of the context class.
    Type: Grant
    Filed: October 27, 2015
    Date of Patent: May 15, 2018
    Assignee: Dolby Laboratories Licensing Corporation
    Inventor: Oliver Wuebbolt
  • Patent number: 9973779
    Abstract: A sequence of 3D VDR images and 3D SDR images are encoded using a monoscopic SDR base layer and one or more enhancement layers. A first VDR view and a first SDR view are encoded with a DVDL encoder to output first and second coded signals. A predicted 3D VDR signal is generated, which has first and second predicted VDR views. First and second VDR residuals are generated based on their respective VDR views and predicted VDR views. A DVDL encoder encodes the first and second VDR residuals to output third and fourth coded signals. A 3D VDR decoder, which has two DVDL decoders and SDR-to-VDR predictors use the four coded input signals to generate a single-view SDR, 3D SDR, single-view VDR, or 3D VDR signals. A corresponding decoder is also described, which is capable of decoding these encoded 3D VDR and SDR images.
    Type: Grant
    Filed: March 6, 2013
    Date of Patent: May 15, 2018
    Assignee: Dolby Laboratories Licensing Corporation
    Inventors: Konstantinos Konstantinides, Tyrome Y. Brown
  • Patent number: 9973771
    Abstract: Implementations are provided that relate, for example, to view tiling in video encoding and decoding. A particular method includes accessing a video picture that includes multiple pictures combined into a single picture (826), accessing information indicating how the multiple pictures in the accessed video picture are combined (806, 808, 822), decoding the video picture to provide a decoded representation of at least one of the multiple pictures (824, 826), and providing the accessed information and the decoded video picture as output (824, 826). Some other implementations format or process the information that indicates how multiple pictures included in a single video picture are combined into the single video picture, and format or process an encoded representation of the combined multiple pictures.
    Type: Grant
    Filed: October 23, 2017
    Date of Patent: May 15, 2018
    Assignee: Dolby Laboratories Licensing Corporation
    Inventors: Purvin Bibhas Pandit, Peng Yin, Dong Tian
  • Patent number: 9972328
    Abstract: A method performed by an audio decoder for reconstructing N audio channels from an audio signal containing M audio channels is disclosed. The method includes receiving a bitstream containing an encoded audio signal having M audio channels and a set of spatial parameters, the set of spatial parameters including an inter-channel intensity difference parameter and an inter-channel coherence parameter. The encoded audio bitstream is then decoded to obtain a decoded frequency domain representation of the M audio channels, and at least a portion of the frequency domain representation is decorrelated with an all-pass filter having a fractional delay. The all-pass filter is attenuated at locations of a transient. A matrixed version of the decorrelated signals are summed with a matrixed version of the decoded frequency domain representation to obtain N audio signals that collectively having N audio channels where M is less than N.
    Type: Grant
    Filed: April 26, 2017
    Date of Patent: May 15, 2018
    Assignee: Dolby International AB
    Inventors: Heiko Purnhagen, Lars Villemoes, Jonas Engdegard, Jonas Roeden, Kristofer Kjoerling
  • Patent number: 9972330
    Abstract: A method performed by an audio decoder for reconstructing N audio channels from an audio signal containing M audio channels is disclosed. The method includes receiving a bitstream containing an encoded audio signal having M audio channels and a set of spatial parameters, the set of spatial parameters including an inter-channel intensity difference parameter and an inter-channel coherence parameter. The encoded audio bitstream is then decoded to obtain a decoded frequency domain representation of the M audio channels, and at least a portion of the frequency domain representation is decorrelated with an all-pass filter having a fractional delay. The all-pass filter is attenuated at locations of a transient. A matrixed version of the decorrelated signals are summed with a matrixed version of the decoded frequency domain representation to obtain N audio signals that collectively having N audio channels where M is less than N.
    Type: Grant
    Filed: April 26, 2017
    Date of Patent: May 15, 2018
    Assignee: Dolby International AB
    Inventors: Heiko Purnhagen, Lars Villemoes, Jonas Engdegard, Jonas Roeden, Kristofer Kjoerling
  • Patent number: 9972329
    Abstract: A method performed by an audio decoder for reconstructing N audio channels from an audio signal containing M audio channels is disclosed. The method includes receiving a bitstream containing an encoded audio signal having M audio channels and a set of spatial parameters, the set of spatial parameters including an inter-channel intensity difference parameter and an inter-channel coherence parameter. The encoded audio bitstream is then decoded to obtain a decoded frequency domain representation of the M audio channels, and at least a portion of the frequency domain representation is decorrelated with an all-pass filter having a fractional delay. The all-pass filter is attenuated at locations of a transient. A matrixed version of the decorrelated signals are summed with a matrixed version of the decoded frequency domain representation to obtain N audio signals that collectively having N audio channels where M is less than N.
    Type: Grant
    Filed: April 26, 2017
    Date of Patent: May 15, 2018
    Assignee: Dolby International AB
    Inventors: Heiko Purnhagen, Lars Villemoes, Jonas Engdegard, Jonas Roeden, Kristofer Kjoerling
  • Patent number: 9972331
    Abstract: A better compromise between a too high bitstream and decoding overhead on the one hand and flexibility of frame element positioning on the other hand is achieved by arranging that each of the sequence of frames of the bitstream has a sequence of N frame elements and, on the other hand, the bitstream has a configuration block having a field indicating the number of elements N and a type indication syntax portion indicating, for each element position of the sequence of N element positions, an element type out of a plurality of element types with, in the sequences of N frame elements of the frames, each frame element being of the element type indicated, by the type indication portion, for the respective element position at which the respective frame element is positioned within the sequence of N frame elements of the respective frame in the bitstream.
    Type: Grant
    Filed: June 5, 2017
    Date of Patent: May 15, 2018
    Assignees: FRAUNHOFER-GESELLSCHAFT ZUR FOERDERUNG DER ANGEWANDTEN FORSCHUNG E.V., DOLBY INTERNATIONAL AB, KONINKLIJKE PHILIPS N.V.
    Inventors: Max Neuendorf, Markus Multrus, Stefan Doehla, Heiko Purnhagen, Frans De Bont
  • Patent number: D819625
    Type: Grant
    Filed: March 28, 2016
    Date of Patent: June 5, 2018
    Assignee: DOLBY LABORATORIES LICENSING CORPORATION
    Inventors: Peter Michaelian, Grayson H. Byrd, Christine Anna Naples