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: 20190058892
    Abstract: The precision of up-sampling operations in a layered coding system is preserved when operating on video data with high bit-depth. In response to bit-depth requirements of the video coding or decoding system, scaling and rounding parameters are determined for a separable up-scaling filter. Input data are first filtered across a first spatial direction using a first rounding parameter to generate first up-sampled data. First intermediate data are generated by scaling the first up-sampled data using a first shift parameter. The intermediate data are then filtered across a second spatial direction using a second rounding parameter to generate second up-sampled data. Second intermediate data are generated by scaling the second up-sampled data using a second shift parameter. Final up-sampled data may be generated by clipping the second intermediate data.
    Type: Application
    Filed: October 23, 2018
    Publication date: February 21, 2019
    Applicant: DOLBY LABORATORIES LICENSING CORPORATION
    Inventors: Peng YIN, Taoran LU, Tao CHEN
  • Publication number: 20190057713
    Abstract: A method for hybrid speech enhancement which employs parametric-coded enhancement (or blend of parametric-coded and waveform-coded enhancement) under some signal conditions and waveform-coded enhancement (or a different blend of parametric-coded and waveform-coded enhancement) under other signal conditions. Other aspects are methods for generating a bitstream indicative of an audio program including speech and other content, such that hybrid speech enhancement can be performed on the program, a decoder including a buffer which stores at least one segment of an encoded audio bitstream generated by any embodiment of the inventive method, and a system or device (e.g., an encoder or decoder) configured (e.g., programmed) to perform any embodiment of the inventive method. At least some of speech enhancement operations are performed by a recipient audio decoder with Mid/Side speech enhancement metadata generated by an upstream audio encoder.
    Type: Application
    Filed: October 22, 2018
    Publication date: February 21, 2019
    Applicants: DOLBY LABORATORIES LICENSING CORPORATION, DOLBY INTERNATIONAL AB
    Inventors: Jeroen KOPPENS, Hannes MUESCH
  • Publication number: 20190058886
    Abstract: For each content-mapped frame of a scene, it is determined whether the content mapped frame is susceptible to object fragmentation with respect to texture in a homogeneous region based on statistical values derived from the content-mapped image and a source image mapped into the content-mapped image. The homogeneous region is a region of consistent texture in the source image. Based on a count of content-mapped frames susceptible to object fragmentation in homogeneous region, it is determined whether the scene is susceptible to object fragmentation in homogeneous region. If so, an upper limit for mapped codewords for a prediction function for predicting codewords of a predicted image from the mapped codewords in the content-mapped image is adjusted. Mapped codewords above the upper limit are clipped to the upper limit.
    Type: Application
    Filed: September 22, 2016
    Publication date: February 21, 2019
    Applicant: Dolby Laboratories Licensing Corporation
    Inventors: Qian CHEN, Guan-Ming SU
  • Publication number: 20190057694
    Abstract: The present disclosure relates to methods for processing a decoded audio signal and for selectively applying speech/dialog enhancement to the decoded audio signal. The present disclosure also relates to a method of operating a headset for computer-mediated reality. A method of processing a decoded audio signal comprises obtaining a measure of a cognitive load of a listener that listens to a rendering of the audio signal, determining whether speech/dialog enhancement shall be applied based on the obtained measure of the cognitive load, and performing speech/dialog enhancement based on the determination. A method of operating a headset for computer-mediated reality comprises obtaining eye-tracking data of a wearer of the headset, determining a measure of a cognitive load of the wearer of the headset based on the eye-tracking data, and outputting an indication of the cognitive load of the wearer of the headset.
    Type: Application
    Filed: August 16, 2018
    Publication date: February 21, 2019
    Applicant: Dolby International AB
    Inventor: Arijit Biswas
  • Publication number: 20190058944
    Abstract: A method of processing a series of microphone inputs of an audio conference, the method including the steps of: (a) conducting a spatial analysis and feature extraction of the audio conference based on current audio activity; (b) aggregating historical information to obtain information about the approximate relative location of recent sound objects relative to the series of microphone inputs; (c) utilising the relative location or distance of the sound objects from the series of microphone inputs to determine if beam forming should be utilised to enhance the audio reception from recent sound objects.
    Type: Application
    Filed: February 23, 2017
    Publication date: February 21, 2019
    Applicant: DOLBY LABORATORIES LICENSING CORPORATION
    Inventors: David GUNAWAN, Glenn N. DICKINS
  • Patent number: 10210872
    Abstract: Some methods involve receiving an input audio signal that includes N input audio channels, the input audio signal representing a first soundfield format having a first soundfield format resolution, N being an integer ?2. A first decorrelation process may be applied to two or more of the input audio channels to produce a first set of decorrelated channels, the first decorrelation process maintaining an inter-channel correlation of the set of input audio channels. A first modulation process may be applied to the first set of decorrelated channels to produce a first set of decorrelated and modulated output channels. The first set of decorrelated and modulated output channels may be combined with two or more undecorrelated output channels to produce an output audio signal that includes O output audio channels representing a second and relatively higher-resolution soundfield format than the first soundfield format, O being an integer ?3.
    Type: Grant
    Filed: March 2, 2016
    Date of Patent: February 19, 2019
    Assignee: Dolby Laboratories Licensing Corporation
    Inventor: David S. McGrath
  • Publication number: 20190052991
    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: February 14, 2019
    Applicant: DOLBY LABORATORIES LICENSING CORPORATION
    Inventors: Jun WANG, Lie LU, Lianwu CHEN, Mingqing HU
  • Publication number: 20190052990
    Abstract: A method for performing DRC on a HOA signal comprises transforming the HOA signal to the spatial domain, analyzing the transformed HOA signal, and obtaining, from results of said analyzing, gain factors that are usable for dynamic compression. The gain factors can be transmitted together with the HOA signal. When applying the DRC, the HOA signal is transformed to the spatial domain, the gain factors are extracted and multiplied with the transformed HOA signal in the spatial domain, wherein a gain compensated transformed HOA signal is obtained. The gain compensated transformed HOA signal is transformed back into the HOA domain, wherein a gain compensated HOA signal is obtained. The DRC may be applied in the QMF-filter bank domain.
    Type: Application
    Filed: February 7, 2018
    Publication date: February 14, 2019
    Applicant: Dolby Laboratories Licensing Corporation
    Inventors: Johannes BOEHM, Florian KEILER
  • Publication number: 20190051312
    Abstract: The present invention provides improvements to prior art audio codecs that generate a stereo-illusion through post-processing of a received mono signal. These improvements are accomplished by extraction of stereo-image describing parameters at the encoder side, which are transmitted and subsequently used for control of a stereo generator at the decoder side. Furthermore, the invention bridges the gap between simple pseudo-stereo methods, and current methods of true stereo-coding, by using a new form of parametric stereo coding. A stereo-balance parameter is introduced, which enables more advanced stereo modes, and in addition forms the basis of a new method of stereo-coding of spectral envelopes, of particular use in systems where guided HFR (High Frequency Reconstruction) is employed. As a special case, the application of this stereo-coding scheme in scalable HFR-based codecs is described.
    Type: Application
    Filed: October 11, 2018
    Publication date: February 14, 2019
    Applicant: DOLBY INTERNATIONAL AB
    Inventors: Fredrik HENN, Kristofer KJORLING, Lars LILJERYD, Jonas RODEN, Jonas ENGDEGARD
  • Publication number: 20190052956
    Abstract: An acoustic manifold for altering a sound wavefront shape from a loudspeaker having a substantially planar driver, comprising a mounting surface configured to attach to a front surface of a case surrounding the driver and having two vertical openings matching corresponding vertical openings in the case to allow sound from the driver to project therethrough, and a waveguide portion coupled to the mounting surface and having a structure channeling sound projected from the driver through the two vertical openings to be combined in one output area. The structure has a plurality of reflective surfaces configured to create output sound that has a consistent dispersion pattern over a defined area. The manifold is configured to increase a vertical and/or horizontal beamwidth of the projected sound so that listeners positioned off an axis of the loudspeaker will hear a wide range of audible frequencies at a substantially similar sound level.
    Type: Application
    Filed: February 22, 2017
    Publication date: February 14, 2019
    Applicant: DOLBY LABORATORIES LICENSING CORPORATION
    Inventors: Michael J. SMITHERS, Garth Norman SHOWALTER
  • Publication number: 20190052989
    Abstract: The present disclosure relates to reverberation generation for headphone virtualization. A method of generating one or more components of a binaural room impulse response (BRIR) for headphone virtualization is described. In the method, directionally-controlled reflections are generated, wherein directionally-controlled reflections impart a desired perceptual cue to an audio input signal corresponding to a sound source location. Then at least the generated reflections are combined to obtain the one or more components of the BRIR. Corresponding system and computer program products are described as well.
    Type: Application
    Filed: October 18, 2018
    Publication date: February 14, 2019
    Applicant: Dolby Laboratories Licensing Corporation
    Inventors: Louis D. FIELDER, Zhiwei SHUANG, Grant A. DAVIDSON, Xiguang ZHENG, Mark S. VINTON
  • Patent number: 10206031
    Abstract: An audio apparatus is configured to switch, when there exists a first audio interface between the audio apparatus and a computer apparatus, to using a second audio interface between the audio apparatus and the computer apparatus, the second audio interface being different from the first audio interface. The switching comprises: receiving, via the first audio interface, combined audio data and non-audio data, the non-audio data comprising a request to switch to using the second audio interface; obtaining the request from the data; and, in response to obtaining the request, transmitting to the computer apparatus a confirmation of switching to using the second audio interface. The audio apparatus and the computer apparatus are described and claimed.
    Type: Grant
    Filed: April 8, 2016
    Date of Patent: February 12, 2019
    Assignee: Dolby Laboratories Licensing Corporation
    Inventors: Glenn N. Dickins, Gopal Erinjippurath, Gary Spittle
  • Publication number: 20190045181
    Abstract: In some embodiments, a display device is disclosed to optically communicating display parameters. The device receives input image data. Embedded in the input image data is a code value identifying a request for a portion of a display parameter of the display device. The device decodes the embedded code value. The device generates an optical image based on the request and transmits the generated optical image to an output of the display device to communicate the requested portion of the requested display parameter.
    Type: Application
    Filed: August 2, 2018
    Publication date: February 7, 2019
    Applicant: Dolby Laboratories Licensing Corporation
    Inventors: Timo KUNKEL, Robin ATKINS, Tao CHEN
  • Publication number: 20190045312
    Abstract: Described herein are audio capture systems and methods. One embodiment provides an audio capture system (1) including: microphones (9-11) positioned to capture respective audio signals from different directions or locations within an audio environment; a mixing module (7) configured to mix the audio signals in accordance with a mixing control signal to produce an output audio mix, wherein, upon the detection of vibration activity, the mixing control signal controls the mixing module (7) to selectively temporarily modify one or more of the audio signals to reduce the presence of noise associated with vibration activity in the output audio mix.
    Type: Application
    Filed: February 16, 2017
    Publication date: February 7, 2019
    Applicant: Dolby Laboratories Licensing Corporation
    Inventors: David GUNAWAN, Glenn N. DICKINS
  • Publication number: 20190045315
    Abstract: A method for interactive and user guided manipulation of multichannel audio content, the method including the steps of: providing a content preview facility for replay and review of multichannel audio content by a user; providing a user interface for the user selection of a segment of multichannel audio content having an unsatisfactory audio content; processing the audio content to include associated audio object activity spatial or signal space regions, to create a time line of activity where one or more spatial or signal space regions are active at any given time; matching the user's gesture input against at least one of the active spatial or signal space regions; signal processing the audio emanating from selected active spatial or signal space region using a number of differing techniques to determine at least one processed alternative; providing the user with an interactive playback facility to listen to the processed alternative.
    Type: Application
    Filed: February 9, 2017
    Publication date: February 7, 2019
    Applicant: Dolby Laboratories Licensing Corporation
    Inventors: Glenn N. DICKINS, David GUNAWAN
  • Publication number: 20190043518
    Abstract: Methods and systems employing an internal microphone and an external microphone of a headset to capture own voice content in the presence of noise, extract the own voice content from background noise (by performing noise reduction on the microphone outputs to generate a noise reduced signal indicative of the own voice content), and optionally also perform voice activity detection to identify segments of own voice presence or absence. In some embodiments, the external microphone is employed to capture the own voice content, the internal microphone signal is employed to infer the noise captured by the external microphone, and the inferred noise is subtracted from the external microphone signal to generate the noise reduced signal. 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: February 24, 2017
    Publication date: February 7, 2019
    Applicant: DOLBY LABORATORIES LICENSING CORPORATION
    Inventor: Chunjian LI
  • Publication number: 20190045177
    Abstract: A projection display system includes a spatial modulator that is controlled to compensate for flare in a lens of the projector. The spatial modulator increases achievable intra-frame contrast and facilitates increased peak luminance without unacceptable black levels. Some embodiments provide 3D projection systems in which the spatial modulator is combined with a polarization control panel.
    Type: Application
    Filed: October 8, 2018
    Publication date: February 7, 2019
    Applicant: Dolby Laboratories Licensing Corporation
    Inventors: Gregory John Ward, Robin Atkins
  • Patent number: 10198792
    Abstract: Several implementations relate, for example, to depth encoding and/or filtering for 3D video (3DV) coding formats. A sparse dyadic mode for partitioning macroblocks (MBs) along edges in a depth map is provided as well as techniques for trilateral (or bilateral) filtering of depth maps that may include adaptive selection between filters sensitive to changes in video intensity and/or changes in depth. One implementation partitions a depth picture, and then refines the partitions based on a corresponding image picture. Another implementation filters a portion of a depth picture based on values for a range of pixels in the portion. For a given pixel in the portion that is being filtered, the filter weights a value of a particular pixel in the range by a weight that is based on one or more of location distance, depth difference, and image difference.
    Type: Grant
    Filed: October 14, 2010
    Date of Patent: February 5, 2019
    Assignee: Dolby Laboratories Licensing Corporation
    Inventors: Wang Lin Lai, Shujie Liu, Dong Tian
  • Patent number: 10200804
    Abstract: Embodiments of the present invention relate to video content assisted audio object extraction. A method of audio object extraction from channel-based audio content is disclosed. The method comprises extracting at least one video object from video content associated with the channel-based audio content, and determining information about the at least one video object. The method further comprises extracting from the channel-based audio content an audio object to be rendered as an upmixed audio signal based on the determined information. Corresponding system and computer program product are also disclosed.
    Type: Grant
    Filed: February 24, 2016
    Date of Patent: February 5, 2019
    Assignee: Dolby Laboratories Licensing Corporation
    Inventors: Lianwu Chen, Xuejing Sun, Lie Lu
  • Patent number: 10200666
    Abstract: Methods and systems for enhancing motion estimation are disclosed for stereoscopic video sequences. The motion vector parameters and disparity values for consecutive frames may be calculated to estimate motion in a coherent manner between two channels, such as a left channel and a right channel in stereoscopic images. Occlusion handling is also applied to improve the estimation.
    Type: Grant
    Filed: February 11, 2016
    Date of Patent: February 5, 2019
    Assignee: Dolby Laboratories Licensing Corporation
    Inventors: Ning Xu, Georgios Georgiadis, James E. Crenshaw
  • Patent number: 10197902
    Abstract: Prism assemblies for projector display systems disclosed receive inputs from discrete color channels (e.g., red, green and blue channels. In one embodiment, “off state” light from the red, green, and blue DLP modulation may be reflected away from on-state light paths within the prism, tending to avoid uncontrolled scatter. In other embodiments, by keeping the colors separate for much of the prism path length, power levels may be significantly reduced at typical failure points. Light efficiency may be increased significantly when using discrete light sources like LEDs and lasers by removal of the additional red, green, and blue separation and re-combination losses.
    Type: Grant
    Filed: December 21, 2015
    Date of Patent: February 5, 2019
    Assignee: Dolby Laboratories Licensing Corporation
    Inventors: Duane Scott Dewald, Nathan Wainwright, Douglas J. Gorny, Martin J. Richards
  • Patent number: 10200703
    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: Grant
    Filed: February 16, 2016
    Date of Patent: February 5, 2019
    Assignee: Dolby Laboratories Licensing Corporation
    Inventors: Guan-Ming Su, Qian Chen
  • Publication number: 20190037214
    Abstract: The quantization parameter QP is well-known in digital video compression as an indication of picture quality. Digital symbols representing a moving image are quantized with a quantizing step that is a function QSN of the quantization parameter QP, which function QSN has been normalized to the most significant bit of the bit depth of the digital symbols. As a result, the effect of a given QP is essentially independent of bit depth a particular QP value has a standard effect on image quality, regardless of bit depth. The invention is useful, for example, in encoding and decoding at different bit depths, to generate compatible, bitstreams having different bit depths, and to allow different bit depths for different components of a video signal by compressing each with the same fidelity (i.e., the same QP).
    Type: Application
    Filed: October 2, 2018
    Publication date: January 31, 2019
    Applicant: Dolby Laboratories Licensing Corporation
    Inventors: Walter C. Gish, Christopher J. Vogt
  • Publication number: 20190037331
    Abstract: Methods for dialogue enhancing audio content, comprising providing a first audio signal presentation of the audio components, providing a second audio signal presentation, receiving a set of dialogue estimation parameters configured to enable estimation of dialogue components from the first audio signal presentation, applying said set of dialogue estimation parameters to said first audio signal presentation, to form a dialogue presentation of the dialogue components; and combining the dialogue presentation with said second audio signal presentation to form a dialogue enhanced audio signal presentation for reproduction on the second audio reproduction system, wherein at least one of said first and second audio signal presentation is a binaural audio signal presentation.
    Type: Application
    Filed: January 26, 2017
    Publication date: January 31, 2019
    Applicants: Dolby Laboratories Licensing Corporation, Dolby International AB
    Inventors: Leif Jonas SAMUELSSON, Dirk Jeroen BREEBAART, David Matthew COOPER, Jeroen KOPPENS
  • Publication number: 20190035410
    Abstract: Encoding/decoding an audio signal having one or more audio components, wherein each audio component is associated with a spatial location. A first audio signal presentation (z) of the audio components, a first set of transform parameters (w(f)), and signal level data (?2) are encoded and transmitted to the decoder. The decoder uses the first set of transform parameters (w(f)) to form a reconstructed simulation input signal intended for an acoustic environment simulation, and applies a signal level modification (?) to the reconstructed simulation input signal. The signal level modification is based on the signal level data (?2) and data (p2) related to the acoustic environment simulation. The attenuated reconstructed simulation input signal is then processed in an acoustic environment simulator. With this process, the decoder does not need to determine the signal level of the simulation input signal, thereby reducing processing load.
    Type: Application
    Filed: January 23, 2017
    Publication date: January 31, 2019
    Applicant: Dolby Laboratories Licensing Corporation
    Inventor: Dirk Jeroen BREEBAART
  • Publication number: 20190037283
    Abstract: Personalized audio metadata is generated based on audio program elements and presentation configuration metadata to specify personalized audio presentations for a media presentation. The personalized audio metadata is transmitted to an adaptive streaming client in response to receiving a media presentation request by the adaptive streaming client for the media presentation. Audio program elements of a specific personalized audio presentation are transmitted to the adaptive streaming client in response to receiving subsequent media streaming requests for the audio program elements.
    Type: Application
    Filed: January 31, 2017
    Publication date: January 31, 2019
    Applicants: DOLBY LABORATORIES LICENSING CORPORATION, DOLBY INTERNATIONAL AB
    Inventors: Kurt KRAUSS, Michael Peter ASSENTI
  • Publication number: 20190037230
    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: September 27, 2018
    Publication date: January 31, 2019
    Applicant: DOLBY LABORATORIES LICENSING CORPORATION
    Inventors: Purvin Bibhas PANDIT, Peng YIN, Dong TIAN
  • Publication number: 20190037333
    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: September 26, 2018
    Publication date: January 31, 2019
    Applicant: DOLBY LABORATORIES LICENSING CORPORATION
    Inventors: Alan J. SEEFELDT, Lie LU, Chen ZHANG
  • Publication number: 20190037301
    Abstract: Personal audio systems and methods are disclosed. A personal audio system includes a voice activity detector to determine whether or not an ambient audio stream contains voice activity, a pitch estimator to determine a frequency of a fundamental component of an annoyance noise contained in the ambient audio stream, and a filter bank to attenuate the fundamental component and at least one harmonic component of the annoyance noise to generate a personal audio stream. The filter bank implements a first filter function when the ambient audio stream does not contain voice activity, or a second filter function when the ambient audio stream contains voice activity.
    Type: Application
    Filed: August 2, 2018
    Publication date: January 31, 2019
    Applicant: Dolby Laboratories Licensing Corporation
    Inventors: Gints KLIMANIS, Anthony PARKS
  • Publication number: 20190035411
    Abstract: A method for generating a bitstream indicative of an object based audio program is described. The bitstream comprises a sequence of containers. A first container of the sequence of containers comprises a plurality of substream entities for a plurality of substreams of the object based audio program and a presentation section. The method comprises determining a set of object channels. The method further comprises providing a set of object related metadata for the set of object channels. In addition, the method comprises inserting a first set of object channel frames and a first set of object related metadata frames into a respective set of substream entities of the first container. Furthermore, the method comprises inserting presentation data into the presentation section.
    Type: Application
    Filed: October 2, 2018
    Publication date: January 31, 2019
    Applicant: DOLBY INTERNATIONAL AB
    Inventors: Christof FERSCH, Alexander STAHLMANN
  • Patent number: 10192568
    Abstract: A method of audio source separation from audio content is disclosed. The method includes determining a spatial parameter of an audio source based on a linear combination characteristic of the audio source and an orthogonality characteristic of two or more audio sources to be separated in the audio content. The method also includes separating the audio source from the audio content based on the spatial parameter. Corresponding system and computer program product are also disclosed.
    Type: Grant
    Filed: February 12, 2016
    Date of Patent: January 29, 2019
    Assignee: Dolby Laboratories Licensing Corporation
    Inventors: Jun Wang, David S. McGrath
  • Patent number: 10194172
    Abstract: An encoding device evaluates a plurality of processing and/or post-processing algorithms and/or methods to be applied to a video stream, and signals a selected method, algorithm, class or category of methods/algorithms either in an encoded bitstream or as side information related to the encoded bitstream. A decoding device or post-processor utilizes the signaled algorithm or selects an algorithm/method based on the signaled method or algorithm. The selection is based, for example, on availability of the algorithm/method at the decoder/post-processor and/or cost of implementation. The video stream may comprise, for example, downsampled multiplexed stereoscopic images and the selected algorithm may include any of upconversion and/or error correction techniques that contribute to a restoration of the downsampled images.
    Type: Grant
    Filed: August 16, 2017
    Date of Patent: January 29, 2019
    Assignee: Dolby Laboratories Licensing Corporation
    Inventors: Alexandros Tourapis, Athanasios Leontaris, Peshala V. Pahalawatta, Kevin J. Stec
  • Patent number: 10194257
    Abstract: Encoding of Higher Order Ambisonics (HOA) signals commonly results in high data rates. For data rate reduction, a method (100) for encoding direction information for frames of an input HOA signal comprises determining (s101) active candidate directions (MDIR(k)) among predefined global directions having global direction indices, dividing (s102) the input HOA signal into frequency subbands (f1 . . .
    Type: Grant
    Filed: July 2, 2015
    Date of Patent: January 29, 2019
    Assignee: Dolby Laboratories Licensing Corporation
    Inventors: Alexander Krueger, Sven Kordon
  • Patent number: 10192517
    Abstract: Source image content is adapted to a target display. Target image content associated with the target display is provided. A histogram is computed for the target image content. A prominent feature present in the target histogram is determined. A histogram is computed for the source image content. The source content histogram is manipulated to reflect the determined target histogram prominent feature(s). Adapted source image content is generated based on the manipulated source histograms(s). Another prominent feature present in the target histogram is determined. The source histogram is further manipulated to reflect the other prominent determined target histogram features. Further adapted source image content is generated based on the further manipulated source histogram if the adapted source image content has insufficient image quality and perceptual color characteristics.
    Type: Grant
    Filed: July 6, 2012
    Date of Patent: January 29, 2019
    Assignee: Dolby Laboratories Licensing Corporation
    Inventors: Anders Ballestad, Gerwin Damberg
  • Patent number: 10194161
    Abstract: A reference picture information decoding unit (13) omits decoding of a reference list sorting presence or absence flag and/or a reference list sorting order based on the number of current picture referable pictures.
    Type: Grant
    Filed: October 20, 2017
    Date of Patent: January 29, 2019
    Assignee: Dolby International AB
    Inventors: Tomoyuki Yamamoto, Tomohiro Ikai, Yukinobu Yasugi, Takeshi Tsukuba
  • Patent number: 10192559
    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 (cn(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: Grant
    Filed: August 28, 2018
    Date of Patent: January 29, 2019
    Assignee: Dolby Laboratories Licensing Corporation
    Inventors: Sven Kordon, Alexander Krueger, Oliver Wuebbolt
  • Patent number: 10192565
    Abstract: The present invention relates to audio coding systems which make use of a harmonic transposition method for high frequency reconstruction (HFR). A system and a method for generating a high frequency component of a signal from a low frequency component of the signal is described. The system comprises an analysis filter bank providing a plurality of analysis subband signals of the low frequency component of the signal. It also comprises a non-linear processing unit to generate a synthesis subband signal with a synthesis frequency by modifying the phase of a first and a second of the plurality of analysis subband signals and by combining the phase-modified analysis subband signals. Finally, it comprises a synthesis filter bank for generating the high frequency component of the signal from the synthesis subband signal.
    Type: Grant
    Filed: September 20, 2017
    Date of Patent: January 29, 2019
    Assignee: Dolby International AB
    Inventors: Lars Villemoes, Per Hedelin
  • Patent number: 10192562
    Abstract: The invention provides an efficient implementation of cross-product enhanced high-frequency reconstruction (HFR), wherein a new component at frequency Q?+r?0 is generated on the basis of existing components at ? and ?+?0. The invention provides a block-based harmonic transposition, wherein a time block of complex subband samples is processed with a common phase modification. Superposition of several modified samples has the net effect of limiting undesirable intermodulation products, thereby enabling a coarser frequency resolution and/or lower degree of oversampling to be used. In one embodiment, the invention further includes a window function suitable for use with block-based cross-product enhanced HFR. A hardware embodiment of the invention may include an analysis filter bank, a subband processing unit configurable by control data and a synthesis filter bank.
    Type: Grant
    Filed: February 26, 2018
    Date of Patent: January 29, 2019
    Assignee: Dolby International AB
    Inventor: Lars Villemoes
  • Patent number: 10194149
    Abstract: In a video processing system, a method and system for generating a transform size syntax element for video decoding are provided. For high profile mode video decoding operations, the transform sizes may be selected based on the prediction macroblock type and the contents of the macroblock. A set of rules may be utilized to select from a 4.×.4 or an 8.×.8 transform size during the encoding operation. Dynamic selection of transform size may be performed on intra-predicted macroblocks, inter-predicted macroblocks, and/or direct mode inter-predicted macroblocks. The encoding operation may generate a transform size syntax element to indicate the transform size that may be used in reconstructing the encoded macroblock. The transform size syntax element may be transmitted to a decoder as part of the encoded video information bit stream.
    Type: Grant
    Filed: January 5, 2018
    Date of Patent: January 29, 2019
    Assignee: Dolby Laboratories Licensing Corporation
    Inventors: Stephen Gordon, Douglas Chin
  • Patent number: 10194160
    Abstract: A system for decoding a video bitstream includes receiving a bitstream and a plurality of enhancement bitstreams together with receiving a video parameter set and a video parameter set extension. The system also receives an output layer set change message including information indicating a change in at least one output layer set.
    Type: Grant
    Filed: April 4, 2014
    Date of Patent: January 29, 2019
    Assignee: Dolby International AB
    Inventor: Sachin G. Deshpande
  • Patent number: 10194127
    Abstract: Systems, apparatus and methods are provided to map a video range of image data to the video range of a display. Embodiments apply a weighted combination of values in input image data streams to generate image data having a range which matches the display capabilities. The weighted combination may be determined based on relative capabilities of the display and input image data. The video range of the image data and display may be a range of colors (gamut) and/or luminance (dynamic range).
    Type: Grant
    Filed: February 29, 2016
    Date of Patent: January 29, 2019
    Assignee: Dolby Laboratories Licensing Corporation
    Inventor: Robin Atkins
  • Publication number: 20190027157
    Abstract: An importance metric, based at least in part on an energy metric, may be determined for each of a plurality of received audio objects. Some methods may involve: determining a global importance metric for all of the audio objects, based, at least in part, on a total energy value calculated by summing the energy metric of each of the audio objects; determining an estimated quantization bit depth and a quantization error for each of the audio objects; calculating a total noise metric for all of the audio objects, the total noise metric being based, at least in part, on a total quantization error corresponding with the estimated quantization bit depth; calculating a total signal-to-noise ratio corresponding with the total noise metric and the total energy value; and determining a final quantization bit depth for each of the audio objects by applying a signal-to-noise ratio threshold to the total signal-to-noise ratio.
    Type: Application
    Filed: January 26, 2017
    Publication date: January 24, 2019
    Applicant: Dolby Laboratories Licensing Corporation
    Inventors: Nicolas R. TSINGOS, Zachary Gideon COHEN, Vivek KUMAR
  • Publication number: 20190028827
    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: Application
    Filed: August 28, 2018
    Publication date: January 24, 2019
    Applicants: Dolby Laboratories Licensing Corporation, Dolby International AB
    Inventors: Michael Ward, Jeffrey Riedmiller, Scott Gregory Norcross, Alexander Stahlmann
  • Patent number: 10186280
    Abstract: The present invention relates to coding of audio signals, and in particular to high frequency reconstruction methods including a frequency domain harmonic transposer. A system and method for generating a high frequency component of a signal from a low frequency component of the signal is described.
    Type: Grant
    Filed: October 25, 2017
    Date of Patent: January 22, 2019
    Assignee: Dolby International AB
    Inventors: Lars Villemoes, Per Ekstrand
  • Patent number: 10187432
    Abstract: A method of facilitating the re-joining of a virtual meeting by a participant. The method comprises determining at what time the participant was disconnected from the virtual meeting; and determining whether or not the participant was talking within a time period containing the time at which the participant was disconnected from the virtual meeting. If it is determined that the participant was talking within the time period, then, consequently, the method comprises deciding not to enable the participant to replay stored data representative of a missed portion of the virtual meeting. As well as the method, related apparatuses, systems and computer readable storage media are disclosed.
    Type: Grant
    Filed: January 17, 2017
    Date of Patent: January 22, 2019
    Assignee: Dolby Laboratories Licensing Corporation
    Inventors: Rowan James Katekar, Glenn N. Dickins
  • Patent number: 10186211
    Abstract: Apparatus and methods are provided that employ one or more of a variety of techniques for reducing the time required to display high resolution images on a high dynamic range display having a light source layer and a display layer. In one technique, the image resolution is reduced, an effective luminance pattern is determined for the reduced resolution image, and the resolution of the effective luminance pattern is then increased to the resolution of the—display layer. In another technique, the light source layer's point spread function is decomposed into a plurality of components, and an effective luminance pattern is determined for each component. The effective luminance patterns are then combined to produce a total effective luminance pattern. Additional image display time reduction techniques are provided.
    Type: Grant
    Filed: February 20, 2018
    Date of Patent: January 22, 2019
    Assignee: Dolby Laboratories Licensing Corporation
    Inventors: Lorne A. Whitehead, Helge Seetzen, Gregory John Ward, Wolfgang Heidrich
  • Publication number: 20190019528
    Abstract: The present document relates to audio source coding systems which make use of a harmonic transposition method for high frequency reconstruction (HFR), as well as to digital effect processors, e.g. exciters, where generation of harmonic distortion add brightness to the processed signal, and to time stretchers where a signal duration is prolonged with maintained spectral content. A system and method configured to generate a time stretched and/or frequency transposed signal from an input signal is described. The system comprises an analysis filterbank configured to provide an analysis subband signal from the input signal; wherein the analysis subband signal comprises a plurality of complex valued analysis samples, each having a phase and a magnitude. Furthermore, the system comprises a subband processing unit configured to determine a synthesis subband signal from the analysis subband signal using a subband transposition factor Q and a subband stretch factor S.
    Type: Application
    Filed: September 19, 2018
    Publication date: January 17, 2019
    Applicant: Dolby International AB
    Inventor: Lars Villemoes
  • Patent number: 10182207
    Abstract: The disclosure relates to handling nuisance in teleconference system. An endpoint device (400) for use in a teleconference includes an acquiring unit (401), a judging unit (402), a controller (403) and a processing unit (404). The acquiring unit acquires a media stream for presentation in the teleconference, and receives information from another device. The information includes a first estimation on whether the media stream is a nuisance to the teleconference. As the nuisance to a teleconference, audio or video signals are perceived by users as actually not relevant to the conference session or causing unpleasant feeling or confusion. The judging unit decides whether the media stream is the nuisance at least based on the information. The controller controls the processing of the media stream to degrade or suppress the presentation of the media stream in case that the media stream is decided as the nuisance. The processing unit processes the media stream under the control of the controller.
    Type: Grant
    Filed: February 16, 2016
    Date of Patent: January 15, 2019
    Assignee: Dolby Laboratories Licensing Corporation
    Inventors: Taoran Lu, Hariharan Ganapathy-Kathirvelu, Peng Yin, Glenn N. Dickins, Xuejing Sun
  • Patent number: 10182235
    Abstract: In a decoder, a processor extracts a control map of false contour filtering from a part of a multi-layer video signal that includes a low dynamic range image mapped from an original high-dynamic range (HDR) image. It determines one or more filter parameters for a sparse finite-impulse-response (FIR) filter, where the one or more filter parameters relate to at least in part on the control map of false contour filtering and a predicted image predicted from the low dynamic range image. It applies the sparse FIR filter to filter pixel values in a portion of the predicted image based at least in part on the control map of false contour filtering, and it reconstructs a version of the original HDR image based at least in part on the portion of the predicted image as filtered by the FIR filter.
    Type: Grant
    Filed: March 30, 2017
    Date of Patent: January 15, 2019
    Assignee: Dolby Laboratories Licensing Corporation
    Inventors: Guan-Ming Su, Qian Chen, Peng Yin, Sheng Qu
  • Patent number: D839452
    Type: Grant
    Filed: June 20, 2016
    Date of Patent: January 29, 2019
    Assignee: Dolby Laboratories Licensing, Corporation
    Inventor: Paul Frick