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

  • Publication number: 20180278963
    Abstract: In a method to reconstruct a high dynamic range video signal, a decoder receives a base layer standard dynamic range video signal, an enhancement layer video signal, a metadata bitstream for a reference processing unit and a CRC code related to the metadata. A decoder reconstructs a high-dynamic range video output signal based on the base layer video signal, the enhancement layer video signal, and the data syntax and metadata specified by the metadata bitstream.
    Type: Application
    Filed: November 1, 2016
    Publication date: September 27, 2018
    Applicants: DOLBY LABORATORIES LICENSING CORPORATION, DOLBY INTERNATIONAL AB
    Inventors: Klaas Heinrich SCHUEUER, BROOKS David, Satoshi TESHIGAWARA, Tao CHEN
  • Patent number: 10085105
    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: Grant
    Filed: December 15, 2017
    Date of Patent: September 25, 2018
    Assignee: Dolby International AB
    Inventor: Lars Villemoes
  • Patent number: 10083701
    Abstract: Encoding and decoding devices for encoding the channels of an audio system having at least four channels are disclosed. The decoding device has a first stereo decoding component which subjects a first pair of input channels to a first stereo decoding, and a second stereo decoding component which subjects a second pair of input channels to a second stereo decoding. The results of the first and second stereo decoding components are crosswise coupled to a third and a fourth stereo decoding component which each performs stereo decoding on one channel resulting from the first stereo decoding component, and one channel resulting from the second stereo decoding component.
    Type: Grant
    Filed: July 11, 2017
    Date of Patent: September 25, 2018
    Assignee: Dolby International AB
    Inventors: Kristofer Kjoerling, Harald Mundt, Heiko Purnhagen
  • Publication number: 20180270600
    Abstract: For generating 3D audio content from a two-channel stereo signal, the stereo signal (x(t)) is partitioned into overlapping sample blocks and is transformed into time-frequency domain. From the stereo signal directional and ambient signal components are separated, wherein the estimated directions of the directional components are changed by a predetermined factor, wherein, if changes are within a predetermined interval, they are combined in order to form a directional centre channel object signal. For the other directions an encoding to Higher Order Ambisonics (HOA) is performed. Additional ambient signal channels are generated by de-correlation and rating by gain factors, followed by encoding to HOA. The directional HOA signals and the ambient HOA signals are combined, and the combined HOA signal and the centre channel object signals are transformed to time domain.
    Type: Application
    Filed: September 29, 2016
    Publication date: September 20, 2018
    Applicant: DOLBY INTERNATIONAL
    Inventors: Johannes BOEHM, Xiaoming CHEN
  • Publication number: 20180270598
    Abstract: Audio perception in local proximity to visual cues is provided. A device includes a video display, first row of audio transducers, and second row of audio transducers. The first and second rows can be vertically disposed above and below the video display. An audio transducer of the first row and an audio transducer of the second row form a column to produce, in concert, an audible signal. The perceived emanation of the audible signal is from a plane of the video display (e.g., a location of a visual cue) by weighing outputs of the audio transducers of the column. In certain embodiments, the audio transducers are spaced farther apart at a periphery for increased fidelity in a center portion of the plane and less fidelity at the periphery.
    Type: Application
    Filed: October 19, 2016
    Publication date: September 20, 2018
    Applicant: DOLBY LABORATORIES LICENSING CORPORATION
    Inventors: Christophe Chabanne, Nicolas R. Tsingos, Charles Q. Robinson
  • Publication number: 20180268831
    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 ({tilde over (C)}, {tilde over (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 ({circumflex over (X)}) corresponding to the signal to be reconstructed.
    Type: Application
    Filed: May 21, 2018
    Publication date: September 20, 2018
    Applicant: DOLBY INTERNATIONAL AB
    Inventors: Lars VILLEMOES, Heidi-Maria LEHTONEN, Heiko PURNHAGEN, Toni HIRVONEN
  • Publication number: 20180268829
    Abstract: Methods for generating an object based audio program which is renderable in a personalizable manner, e.g., to provide an immersive, perception of audio content of the program. Other embodiments include steps of delivering (e.g., broadcasting), decoding, and/or rendering such a program. Rendering of audio objects indicated by the program may provide an immersive experience. The audio content of the program may be indicative of multiple object channels (e.g., object channels indicative of user-selectable and user-configurable objects, and typically also a default set of objects which will be rendered in the absence of a selection by a user) and a bed of speaker channels. Another aspect is an audio processing unit (e.g., encoder or decoder) configured to perform, or which includes a buffer memory which stores at least one frame (or other segment) of an object based audio program (or bitstream thereof) generated in accordance with, any embodiment of the method.
    Type: Application
    Filed: May 24, 2018
    Publication date: September 20, 2018
    Applicants: DOLBY LABORATORIES LICENSING CORPORATION
    Inventors: Robert Andrew FRANCE, Thomas ZIEGLER, Sripal S. MEHTA, Andrew Jonathan DOWELL, Prinyar SAUNGSOMBOON, Michael David DWYER, Farhad FARAHANI, Nicolas R. Tsingos, Freddie SANCHEZ
  • Publication number: 20180268827
    Abstract: The present document relates to a method of layered encoding of a frame of a compressed higher-order Ambisonics, HOA, representation of a sound or sound field. The compressed HOA representation comprises a plurality of transport signals. The method comprises assigning the plurality of transport signals to a plurality of hierarchical layers, the plurality of layers including a base layer and one or more hierarchical enhancement layers, generating, for each layer, a respective HOA extension payload including side information for parametrically enhancing a reconstructed HOA representation obtainable from the transport signals assigned to the respective layer and any layers lower than the respective layer, assigning the generated HOA extension payloads to their respective layers, and signaling the generated HOA extension payloads in an output bitstream.
    Type: Application
    Filed: October 7, 2016
    Publication date: September 20, 2018
    Applicant: DOLBY INTERNATIONAL AB
    Inventors: Sven KORDON, Alexander KRUEGER
  • Publication number: 20180270451
    Abstract: Systems and methods are described for detecting and remedying potential incongruence in a video conference. A camera of a video conferencing system may capture video images of a conference room. A processor of the video conferencing system may identify locations of a plurality of participants within an image plane of a video image. Using face and shape detection, a location of a center point of each identified participant's torso may be calculated. A region of congruence bounded by key parallax lines may be calculated, the key parallax lines being a subset of all parallax lines running through the center points of each identified participant. When the audio device location is not within the region of congruence, audio captured by an audio device may be adjusted to reduce effects of incongruence when the captured audio is replayed at a far end of the video conference.
    Type: Application
    Filed: March 12, 2018
    Publication date: September 20, 2018
    Applicant: Dolby Laboratories Licensing Corporation
    Inventors: Glenn N. DICKINS, Ludovic Christophe MALFAIT, David GUNAWAN
  • Patent number: 10080035
    Abstract: Coding techniques for a video image compression system involve improving an image quality of a sequence of two or more bi-directionally predicted intermediate frames, where each of the frames includes multiple pixels. One method involves determining a brightness value of at least one pixel of each bi-directionally predicted intermediate frame in the sequence as an equal average of brightness values of pixels in non-bidirectionally predicted frames bracketing the sequence of bi-directionally predicted intermediate frames. The brightness values of the pixels in at least one of the non-bidirectionally predicted frames is converted from a non-linear representation.
    Type: Grant
    Filed: September 8, 2017
    Date of Patent: September 18, 2018
    Assignee: Dolby Laboratories Licensing Corporation
    Inventor: Gary A. Demos
  • Patent number: 10079941
    Abstract: A method in a soundfield-capturing endpoint and the capturing endpoint that comprises a microphone array capturing soundfield, and an input processor pre-processing and performing auditory scene analysis to detect local sound objects and positions, de-clutter the sound objects, and integrate with auxiliary audio signals to form a de-cluttered local auditory scene that has a measure of plausibility and perceptual continuity. The input processor also codes the resulting de-cluttered auditory scene to form coded scene data comprising mono audio and additional scene data to send to others. The endpoint includes an output processor generating signals for a display unit that displays a summary of the de-cluttered local auditory scene and/or a summary of activity in the communication system from received data, the display including a shaped ribbon display element that has an extent with locations on the extent representing locations and other properties of different sound objects.
    Type: Grant
    Filed: July 1, 2015
    Date of Patent: September 18, 2018
    Assignee: Dolby Laboratories Licensing Corporation
    Inventors: Glenn N. Dickins, Gary Spittle, David Gunawan, Anthony Tucker
  • Patent number: 10080026
    Abstract: Statistical values are computed based on received source images. An adaptive reshaping function is selected for one or more source images based on the one or more statistical values. A portion of source video content is adaptively reshaped, based on the selected adaptive reshaping function to generate a portion of reshaped video content. The portion of source video content is represented by the one or more source images. An approximation of an inverse of the selected adaptive reshaping function is generated. The reshaped video content and a set of adaptive reshaping parameters defining the approximation of the inverse of the selected adaptive reshaping function are encoded into a reshaped video signal. The reshaped video signal may be processed by a downstream recipient device to generate a version of reconstructed source images, for example, for rendering with a display device.
    Type: Grant
    Filed: March 17, 2016
    Date of Patent: September 18, 2018
    Assignee: Dolby Laboratories Licensing Corporation
    Inventors: Guan-Ming Su, Qiuwei Wang, Hsuan-Ting Chou, Navaneeth Kamballur Kottayil
  • Publication number: 20180262856
    Abstract: Example embodiments disclosed herein relates to upmixing of audio signals. A method of upmixing an audio signal is described. The method includes decomposing the audio signal into a diffuse signal and a direct signal, generating an audio bed at least in part based on the diffuse signal, the audio bed including a height channel, extracting an audio object from the direct signal, estimating metadata of the audio object, the metadata including height information of the audio object; and rendering the audio bed and the audio object as an upmixed audio signal, wherein the audio bed is rendered to a predefined position and the audio object is rendered according to the metadata. Corresponding system and computer program product are described as well.
    Type: Application
    Filed: February 9, 2016
    Publication date: September 13, 2018
    Applicant: DOLBY LABORATORIES LICENSING CORPORATION
    Inventors: Jun WANG, Lie LU, Lianwu CHEN, Mingqing HU
  • Publication number: 20180262551
    Abstract: In one embodiment, a method for optimizing delivery of a digital program having a plurality of selectable program components includes delivering to a first node a composite set of program components, assembling from the composite set first and second subsets of program components, the first and second subsets differing by at least one program component, delivering the first subset of program components to a first user, and delivering the second subset of program components to a second user. The program components relate to multiple program categories and each of the multiple program categories is associated with a program presentation aspect and comprises a plurality of selections.
    Type: Application
    Filed: September 21, 2016
    Publication date: September 13, 2018
    Applicant: Dolby Laboratories Licensing Corporation
    Inventors: Michael F. DEMEYER, Timothy E. ONDERS
  • Publication number: 20180261184
    Abstract: A handheld imaging device has a data receiver that is configured to receive reference encoded image data. The data includes reference code values, which are encoded by an external coding system. The reference code values represent reference gray levels, which are being selected using a reference grayscale display function that is based on perceptual non-linearity of human vision adapted at different light levels to spatial frequencies. The imaging device also has a data converter that is configured to access a code mapping between the reference code values and device-specific code values of the imaging device. The device-specific code values are configured to produce gray levels that are specific to the imaging device. Based on the code mapping, the data converter is configured to transcode the reference encoded image data into device-specific image data, which is encoded with the device-specific code values.
    Type: Application
    Filed: September 21, 2016
    Publication date: September 13, 2018
    Applicant: Dolby Laboratories Licensing Corporation
    Inventor: Ajit NINAN
  • Publication number: 20180262769
    Abstract: Pixel data of a video sequence with enhanced dynamic range (EDR) are predicted based on pixel data of a corresponding video sequence with standard dynamic range (SDR) and an inter-layer predictor. Under a highlights clipping constrain, conventional SDR to EDR prediction is adjusted as follows: a) given a highlights threshold, the SDR to EDR predictor is adjusted to output a fixed output value for all input SDR pixel values larger than the highlights threshold, and b) given a dark-regions threshold, the residual values between the input EDR signal and its predicted value are set to zero for all input SDR pixel values lower than the dark-regions threshold. Example processes to determine the highlights and dark-regions thresholds and whether highlights clipping is occurring are provided.
    Type: Application
    Filed: February 16, 2016
    Publication date: September 13, 2018
    Applicant: DOLBY LABORATORIES LICENSING CORPORATION
    Inventors: Guan-Ming SU, Qian CHEN
  • Patent number: 10075799
    Abstract: The invention discloses rendering sound field signals, such as Higher-Order Ambisonics (HOA), for arbitrary loudspeaker setups, where the rendering results in highly improved localization properties and is energy preserving. This is obtained by a new type of decode matrix for sound field data, and a new way to obtain the decode matrix.
    Type: Grant
    Filed: March 14, 2018
    Date of Patent: September 11, 2018
    Assignee: Dolby Laboratories Licensing Corporation
    Inventors: Johannes Boehm, Florian Keiler
  • Patent number: 10074379
    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: Grant
    Filed: January 26, 2018
    Date of Patent: September 11, 2018
    Assignees: Dolby Laboratories Licensing Corporation, Dolby International AB
    Inventors: Jeffrey Riedmiller, Karl J. Roeden, Kristofer Kjoerling, Heiko Purnhagen, Vinay Melkote, Leif Sehlstrom
  • Patent number: 10074012
    Abstract: Image data relating to real-world objects or persons is collected from a scene while collecting audio data relating to the real-world objects or persons from the same scene. The audio data is used to derive sound objects corresponding to the real-world objects or persons. The image data is used to derive video objects corresponding to the real-world objects or persons. Based on the sound objects and the video objects, candidate salient objects are generated. A salient object is selected from among the candidate salient objects. Perceptual enhancement operations are performed on the selected salient object.
    Type: Grant
    Filed: June 15, 2017
    Date of Patent: September 11, 2018
    Assignee: Dolby Laboratories Licensing Corporation
    Inventors: Cong Zhou, Timo Kunkel, Cristina Michel Vasco
  • Patent number: 10074382
    Abstract: The present document relates to the determination of a 200 bitrate related to an encoded bitstream, and describes a method for determining an estimate of a bitrate of a bitstream comprising a sequence of frames comprising a varying number of bitsand corresponding to excerpts of an audio and/or video signal. At least two frames of the sequence of frames comprise a parameter indicative of a processing delay for the corresponding frame. The method comprises determining: a total number of bits for a subsequence of frames from the bitstream; a corrected number 201 of frames based on a number of frames comprised within the subsequence and the parameters of at least two frames of the subsequence; and a lower bitrate bound and an upper bitrate bound of the bitrate based on the total number of bits, the corrected number of frames and a frame rate of the bitstream.
    Type: Grant
    Filed: November 27, 2014
    Date of Patent: September 11, 2018
    Assignee: Dolby International AB
    Inventors: Holger Hoerich, Alexander Groeschel, Jens Popp, Marc Roessler, Malte Schmidt
  • Publication number: 20180255398
    Abstract: A system and method of providing a signal to wireless speakers. An audio stick connects to a source device and provides the audio signal to the wireless speakers. The audio stick combines the functionality of two separate devices: an audio receiver device and a transmitter device for the wireless speakers.
    Type: Application
    Filed: September 1, 2016
    Publication date: September 6, 2018
    Applicant: DOLBY LABORATORIES LICENSING CORPORATION
    Inventors: David Matthew FISCHER, Sripal S. MEHTA, Timothy James EGGERDING
  • Publication number: 20180255206
    Abstract: Methods and systems for color transforms are disclosed. A memory footprint of look up tables for color transforms can be reduced by separating the look up tables into factors, applying frequency domain transforms, dividing the look up tables into zones, or establishing hierarchical levels with increasing resolution. The methods can be applied to still image or video cameras with limited computation resources that can benefit from reduced memory footprints.
    Type: Application
    Filed: September 29, 2016
    Publication date: September 6, 2018
    Applicant: DOLBY LABORATORIES LICENSING CORPORATION
    Inventors: Joonsoo KIM, Jon S. MCELVAIN
  • Publication number: 20180254047
    Abstract: Systems, methods, and computer program products of audio processing based on Adaptive Intermediate Spatial Format (AISF) are described. The AISF is an extension to ISF that allows spatial resolution around an ISF ring to be adjusted dynamically with respect to content of incoming audio objects. An AISF encoder device adaptively warps each ISF ring during ISF encoding to adjust angular distance between objects, resulting in increase in uniformity of energy distribution around the ISF ring. At an AISF decoder device, matrices that decode sound positions to the output speaker take into account the warping that was performed at the AISF encoder device to reproduce the true positions of sound sources.
    Type: Application
    Filed: February 22, 2018
    Publication date: September 6, 2018
    Applicant: Dolby Laboratories Licensing Corporation
    Inventors: Juan Felix TORRES, David S. MCGRATH, Michael William MASON
  • Publication number: 20180254053
    Abstract: Example embodiments disclosed herein relate to filter coefficient updating in time domain filtering. A method of processing an audio signal is disclosed. The method includes obtaining a predetermined number of target gains for a first portion of the audio signal by analyzing the first portion of the audio signal. Each of the target gains is corresponding to a linear subband of the audio signal. The method also includes determining a filter coefficients for time domain filtering the first portion of the audio signal so as to approximate a frequency response given by the target gains. The filter coefficients are determined by iteratively selecting at least one target gain from the target gains and updating the filter coefficient based on the selected at least one target gain. Corresponding system and computer program product for processing an audio signal are also disclosed.
    Type: Application
    Filed: September 15, 2016
    Publication date: September 6, 2018
    Applicant: DOLBY LABORATORIES LICENSING CORPORATION
    Inventors: Dong SHI, Xuejing SUN
  • Patent number: 10068577
    Abstract: A method of encoding adaptive audio, comprising receiving N objects and associated spatial metadata that describes the continuing motion of these objects, and partitioning the audio into segments based on the spatial metadata. The method encodes adaptive audio having objects and channel beds by capturing a continuing motion of a number N objects in a time-varying matrix trajectory comprising a sequence of matrices, coding coefficients of the time-varying matrix trajectory in spatial metadata to be transmitted via a high-definition audio format for rendering the adaptive audio through a number M output channels, and segmenting the sequence of matrices into a plurality of sub-segments based on the spatial metadata, wherein the plurality of sub-segments are configured to facilitate coding of one or more characteristics of the adaptive audio.
    Type: Grant
    Filed: April 23, 2015
    Date of Patent: September 4, 2018
    Assignee: Dolby Laboratories Licensing Corporation
    Inventors: Vinay Melkote, Malcolm James Law, Roy M. Fejgin
  • Patent number: 10070243
    Abstract: Audio content coded for a reference speaker configuration is downmixed to downmix audio content coded for a specific speaker configuration. One or more gain adjustments are performed on individual portions of the downmix audio content coded for the specific speaker configuration. Loudness measurements are then performed on the individual portions of the downmix audio content. An audio signal that comprises the audio content coded for the reference speaker configuration and downmix loudness metadata is generated. The downmix loudness metadata is created based at least in part on the loudness measurements on the individual portions of the downmix audio content.
    Type: Grant
    Filed: June 16, 2017
    Date of Patent: September 4, 2018
    Assignees: Dolby Laboratories Licensing Corporation, Dolby International AB
    Inventors: Michael Ward, Jeffrey Riedmiller, Scott Gregory Norcross, Alexander Groeschel
  • Publication number: 20180247656
    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: Application
    Filed: April 30, 2018
    Publication date: August 30, 2018
    Applicant: DOLBY LABORATORIES LICENSING CORPORATION
    Inventors: Oliver WUEBBOLT, Johannes BOEHM, Peter JAX
  • Publication number: 20180247660
    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: February 23, 2018
    Publication date: August 30, 2018
    Applicant: DOLBY INTERNATIONAL AB
    Inventors: Heiko PURNHAGEN, Kristofer KJOERLING, Alexander STAHLMANN, Jens POPP, Karl Jonas ROEDEN
  • Publication number: 20180247646
    Abstract: One or more context aware processing parameters and an ambient audio stream are received. One or more sound characteristics associated with the ambient audio stream are identified using a machine learning model. One or more actions to perform are determined using the machine learning model and based on the one or more context aware processing parameters and the identified one or more sound characteristics. The one or more actions are performed.
    Type: Application
    Filed: December 21, 2017
    Publication date: August 30, 2018
    Applicant: Dolby Laboratories Licensing Corporation
    Inventors: Jacob Meacham, Matthew Sills, Richard Fritz Lanman, III, Jeffrey Baker
  • Patent number: 10063845
    Abstract: A 3D display is characterized by a quality of viewing experience (QVE) mapping which represents a display-specific input-output relationship between input depth values and output QVE values. Examples of QVE mappings based on a metric of “viewing blur” are presented. Given reference depth data generated for a reference display and a representation of an artist's mapping function, which represents an input-output relationship between original input depth data and QVE data generated using a QVE mapping for a reference display, a decoder may reconstruct the reference depth data and apply an inverse QVE mapping for a target display to generate output depth data optimized for the target display.
    Type: Grant
    Filed: March 17, 2014
    Date of Patent: August 28, 2018
    Assignee: Dolby Laboratories Licensing Corporation
    Inventors: Gopi Lakshminarayan, Samir Hulyalkar, Tao Chen, Hariharan Ganapathy, Santosh Chilkunda
  • Patent number: 10063985
    Abstract: Audio signals (201) are received. The audio signals include left and right surround channels (206). The audio signals are played back using far-field loudspeakers (101-108, 401-406) distributed around a space (111, 409) having a plurality of listener positions (112, 410). The left and right surround channels are played back by a pair of far-field loudspeakers (103, 106, 403, 405) arranged at opposite sides of the space having the plurality of listener positions. An audio component (208) coinciding with or approximating audio content common to the left and right surround channels is obtained. The audio component is played back using at least a pair of near-field transducers (109, 110, 407, 408) arranged at one of the listener positions. Associated systems (100, 400), methods (800) and computer program products are provided.
    Type: Grant
    Filed: May 12, 2016
    Date of Patent: August 28, 2018
    Assignee: Dolby Laboratories Licensing Corporation
    Inventors: Remi Audfray, Nicolas R. Tsingos, Jurgen W. Scharpf
  • Patent number: 10062333
    Abstract: Systems and methods are disclosed for dynamically adjusting the backlight of a display during video playback or for generating filtered video metadata. Given an input video stream and associated metadata values of minimum, average, or maximum luminance values of the video frames in the video stream, values of a function of the frame min, mid, or max luminance values are filtered using a temporal filter to generate a filtered output value for each frame. At least one filtering coefficient of the temporal filter is adapted based on a logistic function controlled by slope and sensitivity values. The instantaneous dynamic range of a target display is determined based on the filtered metadata values and the minimum and maximum brightness values of the display.
    Type: Grant
    Filed: October 5, 2016
    Date of Patent: August 28, 2018
    Assignee: Dolby Laboratories Licensing Corporation
    Inventors: Suzanne Farrell, Scott Daly, Robin Atkins, Timo Kunkel, Kimball Darr Thurston, III
  • Publication number: 20180242077
    Abstract: A soundbar speaker for transmitting reflected sound waves off an upper surface down to a listening environment, comprising: a cabinet containing a plurality of audio drivers, direct-firing drivers within the cabinet oriented to transmit sound along a horizontal axis substantially perpendicular to a front surface of the cabinet, and a pair of upward-firing slotted drivers placed proximate to ends of an top surface of the cabinet and oriented at an inclination angle relative to the horizontal axis. The slotted drivers are configured to create an overlapping reflected sound projection for high frequency sound when reflected down to a listening position located at a distance in front of the speaker pair. Such a speaker projects reflected sound that provides wider horizontal or side-to-side dispersion to better cover the listening area.
    Type: Application
    Filed: August 11, 2016
    Publication date: August 23, 2018
    Applicant: Dolby Laboratories Licensing Corporation
    Inventors: Michael J. SMITHERS, Alan J. SEEFELDT
  • Publication number: 20180240469
    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: Application
    Filed: April 18, 2018
    Publication date: August 23, 2018
    Applicant: Dolby Laboratories Licensing Corporation
    Inventors: Alexander KRUEGER, Sven KORDON, Oliver WUEBBOLT
  • Publication number: 20180240465
    Abstract: The present disclosure provides methods, devices and computer program products for encoding and decoding of a vector of parameters in an audio coding system. The disclosure further relates to a method and apparatus for reconstructing an audio object in an audio decoding system. According to the disclosure, a modulo differential approach for coding and encoding a vector of a non-periodic quantity may improve the coding efficiency and provide encoders and decoders with less memory requirements. Moreover, an efficient method for encoding and decoding a sparse matrix is provided.
    Type: Application
    Filed: April 5, 2018
    Publication date: August 23, 2018
    Applicant: DOLBY INTERNATIONAL AB
    Inventors: Leif Jonas SAMUELSSON, Heiko PURNHAGEN
  • Publication number: 20180240470
    Abstract: Example embodiments disclosed herein relate to source separation in audio content. A method for separating sources from audio content is disclosed, the audio content being of a multi-channel format based on a plurality of channels. The method comprises performing a component analysis on the audio content for each of the plurality of channels to generate a plurality of components, each of the plurality of components comprising a plurality of time-frequency tiles in full frequency band; generating at least one dominant source with at least one of the time-frequency tiles from the plurality of the components and separating the sources from the audio content by estimating spatial parameters and spectral parameters based on the dominant source. Corresponding system and computer program product are also disclosed.
    Type: Application
    Filed: February 11, 2016
    Publication date: August 23, 2018
    Applicant: DOLBY LABORATORIES LICENSING CORPORATION
    Inventor: Jun WANG
  • Publication number: 20180240437
    Abstract: A handheld imaging device has a data receiver that is configured to receive reference encoded image data. The data includes reference code values, which are encoded by an external coding system. The reference code values represent reference gray levels, which are being selected using a reference grayscale display function that is based on perceptual non-linearity of human vision adapted at different light levels to spatial frequencies. The imaging device also has a data converter that is configured to access a code mapping between the reference code values and device-specific code values of the imaging device. The device-specific code values are configured to produce gray levels that are specific to the imaging device. Based on the code mapping, the data converter is configured to transcode the reference encoded image data into device-specific image data, which is encoded with the device-specific code values.
    Type: Application
    Filed: April 23, 2018
    Publication date: August 23, 2018
    Applicant: DOLBY LABORATORIES LICENSING CORPORATION
    Inventors: Jon Scott MILLER, Scott DALY, Mahdi NEZAMABADI, Robin ATKINS
  • Patent number: 10057708
    Abstract: Embodiments are described for an adaptive audio system that processes audio data comprising a number of independent monophonic audio streams. One or more of the streams has associated with it metadata that specifies whether the stream is a channel-based or object-based stream. Channel-based streams have rendering information encoded by means of channel name; and the object-based streams have location information encoded through location expressions encoded in the associated metadata. A codec packages the independent audio streams into a single serial bitstream that contains all of the audio data. This configuration allows for the sound to be rendered according to an allocentric frame of reference, in which the rendering location of a sound is based on the characteristics of the playback environment (e.g., room size, shape, etc.) to correspond to the mixer's intent.
    Type: Grant
    Filed: February 26, 2018
    Date of Patent: August 21, 2018
    Assignee: Dolby Laboratories Licensing Corporation
    Inventors: Charles Q. Robinson, Nicolas R. Tsingos, Christophe Chabanne
  • Patent number: 10056055
    Abstract: Apparatus and methods for mapping video signal parameters such as tone and color may be applied at various points in a video generation and delivery pipeline. apparatus may be configured to control mappings based on a range of inputs which may include one or more of: ambient conditions, user inputs, control information, adaptation models. Apparatus and methods may be applied to display video or other images so as to preserve a creative intent embodied in video or other image data.
    Type: Grant
    Filed: February 18, 2011
    Date of Patent: August 21, 2018
    Assignee: Dolby Laboratories Licensing Corporation
    Inventors: Helge Seetzen, Robin Atkins, Neil W. Messmer, Gerwin Damberg
  • Patent number: 10057707
    Abstract: Various disclosed implementations involve processing and/or playback of a recording of a conference involving a plurality of conference participants. Some implementations involve receiving or determining conversational dynamics data. One or more variables of a cost function may be based, at least in part, on the conversational dynamics data. The cost function may be a spatial optimization cost function of a vector describing a virtual conference participant position for each of the conference participants in a virtual acoustic space. The virtual acoustic space may be determined relative to a listener's head. The virtual conference participant positions may be assigned according to a solution of the cost function.
    Type: Grant
    Filed: February 3, 2016
    Date of Patent: August 21, 2018
    Assignee: Dolby Laboratories Licensing Corporation
    Inventors: Richard J. Cartwright, Hannes Muesch
  • Patent number: 10055866
    Abstract: Systems and methods for overlaying a second image/video data onto a first image/video data are described herein. The first image/video data may be intended to be rendered on a display with certain characteristics—e.g., HDR, EDR, VDR or UHD capabilities. The second image/video data may comprise graphics, closed captioning, text, advertisement—or any data that may be desired to be overlaid and/or composited onto the first image/video data. The second image/video data may be appearance mapped according to the image statistics and/or characteristics of the first image/video data. In addition, such appearance mapping may be made according to the characteristics of the display that the composite data is to be rendered. Such appearance mapping is desired to render a composite data that is visually pleasing to a viewer, rendered upon a desired display.
    Type: Grant
    Filed: January 27, 2014
    Date of Patent: August 21, 2018
    Assignee: Dolby Laboratories Licensing Corporation
    Inventors: Timo Kunkel, Ning Xu, Tao Chen, Bongsun Lee, Samir N. Hulyalkar
  • Patent number: 10056042
    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: Grant
    Filed: May 11, 2016
    Date of Patent: August 21, 2018
    Assignee: Dolby Laboratories Licensing Corporation
    Inventors: Robin Atkins, Gregory John Ward, Samir N. Hulyalkar, Guan-Ming Su, Sheng Qu
  • Patent number: 10057808
    Abstract: The present disclosure provides methods, devices and computer program products for non-uniform quantization of parameters relating to parametric spatial coding of audio signals. The disclosure further relates to a method and apparatus for reconstructing an audio object in an audio decoding system taking the non-uniformly quantized parameters into account. According to the disclosure, such an approach renders it possible to reduce bit consumption without substantially reducing the quality of the reconstructed audio object.
    Type: Grant
    Filed: May 2, 2017
    Date of Patent: August 21, 2018
    Assignee: Dolby International AB
    Inventors: Heiko Purnhagen, Per Ekstrand
  • Patent number: 10057581
    Abstract: Methods and systems for improving coding decoding efficiency of video by providing a syntax modeler, a buffer, and a decoder. The syntax modeler may associate a first sequence of symbols with syntax elements. The buffer may store tables, each represented by a symbol in the first sequence, and each used to associate a respective symbol in a second sequence of symbols with encoded data. The decoder decodes the data into a bitstream using the second sequence retrieved from a table.
    Type: Grant
    Filed: June 15, 2017
    Date of Patent: August 21, 2018
    Assignee: Dolby International AB
    Inventors: Yeping Su, Christopher A. Segall
  • Publication number: 20180234785
    Abstract: A method for compressing a HOA signal being an input HOA representation with input time frames (C(k)) of HOA coefficient sequences comprises spatial HOA encoding of the input time frames and subsequent perceptual encoding and source encoding. Each input time frame is decomposed (802) into a frame of predominant sound signals (XPS(k?1)) and a frame of an ambient HOA component ({tilde over (C)}AMB(k?1)). The ambient HOA component ({tilde over (C)}AMB(k?1)) comprises, in a layered mode, first HOA coefficient sequences of the input HOA representation (cAMB,n(k?1)) in lower positions and second HOA coefficient sequences (cAMB,n(k?1)) in remaining higher positions. The second HOA coefficient sequences are part of an HOA representation of a residual between the input HOA representation and the HOA representation of the predominant sound signals.
    Type: Application
    Filed: February 8, 2018
    Publication date: August 16, 2018
    Applicant: DOLBY LABORATORIES LICENSING CORPORATION
    Inventors: Sven KORDON, Alexander KRUEGER, Oliver WUEBBOLT
  • Publication number: 20180234704
    Abstract: In a method to improve backwards compatibility when decoding high-dynamic range images coded in a wide color gamut (WCG) space which may not be compatible with legacy color spaces, hue and/or saturation values of images in an image database are computed for both a legacy color space (say, YCbCr-gamma) and a preferred WCG color space (say, IPT-PQ). Based on a cost function, a reshaped color space is computed so that the distance between the hue values in the legacy color space and rotated hue values in the preferred color space is minimized HDR images are coded in the reshaped color space. Legacy devices can still decode standard dynamic range images assuming they are coded in the legacy color space, while updated devices can use color reshaping information to decode HDR images in the preferred color space at full dynamic range.
    Type: Application
    Filed: August 3, 2016
    Publication date: August 16, 2018
    Applicant: Dolby Laboratories Licensing Corporation
    Inventors: Robin ATKINS, Peng YIN, Taoran LU, Jaclyn Anne PYTLARZ
  • Publication number: 20180234612
    Abstract: Methods, systems, and computer program products for automatically positioning a content capturing device are disclosed. A vehicle, e.g., an UAV, carries the content capturing device, e.g., a camcorder. The UAV can position the content capturing device at a best location for viewing a subject based on one or more audio or visual cues. The UAV can follow movement of the subject to achieve best audio or visual effect. In some implementations, a controller device carried by the subject can generate one or more signals for the UAV to follow. The controller device may be coupled to a microphone that records audio. The signals can be used to temporally synchronize video captured at the UAV and audio captured by the microphone.
    Type: Application
    Filed: October 17, 2017
    Publication date: August 16, 2018
    Applicant: Dolby Laboratories Licensing Corporation
    Inventors: Timo KUNKEL, Cong ZHOU, Vivek KUMAR, Remi S. AUDFRAY
  • Publication number: 20180234069
    Abstract: A method in a computing device configured to perform volume-levelling processing on input audio data by at least applying one or more filters to the input audio data, the computing device being configured to obtain an estimated difference between a target output loudness level and a loudness level associated with the input audio data, and to adapt the filter coefficients of the one or more filters based on the estimated difference. The method involves starting, or stopping, the volume-levelling processing. The method comprises gradually increasing, or decreasing, a weighting applied to the estimated difference, in response to obtaining an indication to start, or stop, the volume-levelling processing.
    Type: Application
    Filed: August 17, 2016
    Publication date: August 16, 2018
    Applicant: DOLBY LABORATORIES LICENSING CORPORATION
    Inventor: Mark David DE BURGH
  • Publication number: 20180233156
    Abstract: A method for representing a second presentation of audio channels or objects as a data stream, the method comprising the steps of: (a) providing a set of base signals, the base signals representing a first presentation of the audio channels or objects; (b) providing a set of transformation parameters, the transformation parameters intended to transform the first presentation into the second presentation; the transformation parameters further being specified for at least two frequency bands and including a set of multi-tap convolution matrix parameters for at least one of the frequency bands.
    Type: Application
    Filed: August 23, 2016
    Publication date: August 16, 2018
    Applicants: DOLBY LABORATORIES LICENSING CORPORATION, DOLBY INTERNATIONAL AB
    Inventors: Dirk Jeroen BREEBAART, David Matthew COOPER, Leif Jonas SAMUELSSON
  • Patent number: D828845
    Type: Grant
    Filed: January 5, 2015
    Date of Patent: September 18, 2018
    Assignee: Dolby International AB
    Inventors: Sigrid Harder, Robert Andrew France, Thomas Ziegler, Radoslaw Musial, Christopher Oates