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: 20170086007
    Abstract: Improved tools for authoring and rendering audio reproduction data are provided. Some such authoring tools allow audio reproduction data to be generalized for a wide variety of reproduction environments. Audio reproduction data may be authored by creating metadata for audio objects. The metadata may be created with reference to speaker zones. During the rendering process, the audio reproduction data may be reproduced according to the reproduction speaker layout of a particular reproduction environment.
    Type: Application
    Filed: December 2, 2016
    Publication date: March 23, 2017
    Applicant: Dolby Laboratories Licensing Corporation
    Inventors: Nicolas R. TSINGOS, Charles Q. ROBINSON, Jurgen W. SCHARPF
  • Publication number: 20170086008
    Abstract: A method of rendering an audio program by generating one or more loudspeaker channel feeds based on the dynamic trajectory of each audio object in the audio program, wherein the parameters of the dynamic trajectory may be included explicitly in the audio program, or may be derived from the instantaneous location of audio objects at two or more points in time. Embodiments include rendering audio by defining a nominal loudspeaker map of loudspeakers used for playback of the audio program, determining a trajectory of an auditory source corresponding to one or more audio objects through 3D space, generating loudspeaker signals feeding the loudspeakers based on the one or more audio object trajectories, and rendering the one or more audio objects based on object location to match the trajectory of the auditory source as perceived by a listener.
    Type: Application
    Filed: September 21, 2016
    Publication date: March 23, 2017
    Applicant: Dolby Laboratories Licensing Corporation
    Inventor: Charles Q. Robinson
  • Publication number: 20170085250
    Abstract: An apparatus for generating real-valued output audio samples is disclosed. The apparatus includes a memory that stores complex-valued input subband samples, real-valued demodulated samples, and the real-valued output audio samples. The apparatus also incudes a phase shifter that shifts a phase of the complex-valued input subband samples by an amount equal to a previously added phase shift and a complex-valued synthesis filter bank that generates the real-valued output audio samples in response to the complex-valued input subband samples, the real-valued demodulated samples, and prototype filter coefficients.
    Type: Application
    Filed: November 30, 2016
    Publication date: March 23, 2017
    Applicant: Dolby International AB
    Inventor: Per Ekstrand
  • Publication number: 20170085918
    Abstract: Video data with both ultra-high definition (UHD) resolution and high or enhanced dynamic range (EDR) data are coded in a backward-compatible layered stream which allows legacy decoders to extract an HD standard dynamic range (SDR) signal. In response to a base layer HD SDR signal, a predicted signal is generated using separate luma and chroma prediction models. In the luma predictor, luma pixel values of the predicted signal are computed based only on luma pixel values of the base layer, while in the chroma predictor, chroma pixel values of the predicted signal are computed based on both the luma and the chroma pixel values of the base layer. A residual signal is computed based on the input UHD EDR signal and the predicted signal. The base layer and the residual signal are coded separately to form a coded bitstream. A compatible dual-layer decoder is also presented.
    Type: Application
    Filed: December 6, 2016
    Publication date: March 23, 2017
    Applicant: Dolby Laboratories Licensing Corporation
    Inventors: Guan-Ming SU, Robin ATKINS, Qian CHEN
  • Publication number: 20170084281
    Abstract: A method and system for reconstructing an original audio signal is disclosed. The original audio signal has a baseband up to a cutoff frequency and high-frequency components not included in the baseband above the cutoff frequency. The system includes a bitstream deformatter that extracts a representation of the baseband, an estimated spectral envelope, and noise-blending parameters from an audio bitstream. The system also includes a spectral component regenerator that copies or translates all or at least some of the baseband spectral components to non-overlapping frequency ranges of the high-frequency components not included in the baseband to generate regenerated spectral components. The system further includes a gain adjuster that modifies a spectral envelope of the regenerated spectral components based at least in part on the estimated spectral envelope and the noise-blending parameters to generate gain-adjusted regenerated spectral components.
    Type: Application
    Filed: December 6, 2016
    Publication date: March 23, 2017
    Applicant: Dolby Laboratories Licensing Corporation
    Inventors: Michael M. Truman, Mark S. Vinton
  • Publication number: 20170084283
    Abstract: The present invention relates to a new method and apparatus for improvement of High Frequency Reconstruction (HFR) techniques using frequency translation or folding or a combination thereof. The proposed invention is applicable to audio source coding systems, and offers significantly reduced computational complexity. This is accomplished by means of frequency translation or folding in the subband domain, preferably integrated with spectral envelope adjustment in the same domain. The concept of dissonance guard-band filtering is further presented. The proposed invention offers a low-complexity, intermediate quality HFR method useful in speech and natural audio coding applications.
    Type: Application
    Filed: December 6, 2016
    Publication date: March 23, 2017
    Applicant: Dolby International AB
    Inventors: Lars G. Liljeryd, Per Ekstrand, Fredrik Henn, Kristofer Kjoerling
  • Publication number: 20170085881
    Abstract: Methods to reduce chroma-related artifacts during video coding of high dynamic range images are presented. Given an input signal in a color space comprising a luma component and two chromaticity components, a processor determines the original white point chromaticity coordinates (Du, Dv) of a white point in the color space of the input signal. The input signal is translated using a chromaticity translation function to a second signal in a translated color space comprising two translated chromaticity components, wherein the chromaticity translation function shifts the original white point chromaticity coordinates to a predetermined second set of coordinates in the translated chromaticity color space. The second signal is encoded to generate a coded bit stream.
    Type: Application
    Filed: December 6, 2016
    Publication date: March 23, 2017
    Applicant: Dolby Laboratories Licensing Corporation
    Inventors: Robin ATKINS, Jon Scott MILLER
  • Patent number: 9601122
    Abstract: A decoding system (100) reconstructs an n-channel audio signal on the basis of an input signal (A) representing the audio signal either by parametric coding or as n discretely coded channels. Parametric decoding proceeds on the basis of a core signal and mixing parameters (a) controlling a spatial synthesis stage (150), which is supplied with a downmix signal from a downmix stage (140). A selector (170) controls the components of the decoding system, in steady-state parametric and discrete decoding mode and transitions between these. The downmix stage realizes a projection on the downmix signal based on an n-channel signal, either an n-channel input signal or a core signal padded with neutral values. The downmix stage is active in each time frame in which the input signal represents the audio signal by parametric coding and in at least the first time frame after the last time frame in each episode of parametrically coded time frames.
    Type: Grant
    Filed: June 14, 2013
    Date of Patent: March 21, 2017
    Assignee: Dolby International AB
    Inventors: Heiko Purnhagen, Leif Sehlstrom, Karl Jonas Roeden, Kristofer Kjoerling, Lars Villemoes
  • Patent number: 9602940
    Abstract: In some embodiments, a method for monitoring speakers within an audio playback system (e.g., movie theater) environment. In typical embodiments, the monitoring method assumes that initial characteristics of the speakers (e.g., a room response for each of the speakers) have been determined at an initial time, and relies on one or more microphones positioned in the environment to perform a status check on each of the speakers to identify whether a change to at least one characteristic of any of the speakers has occurred since the initial time. In other embodiments, the method processes data indicative of output of a microphone to monitor audience reaction to an audiovisual program. Other aspects include a system configured (e.g., programmed) to perform any embodiment of the inventive method, and a computer readable medium (e.g., a disc) which stores code for implementing any embodiment of the inventive method.
    Type: Grant
    Filed: September 30, 2016
    Date of Patent: March 21, 2017
    Assignee: Dolby Laboratories Licensing Corporation
    Inventors: Sunil Bharitkar, Brett Crockett, Louis Fielder, Michael Rockwell
  • Patent number: 9601133
    Abstract: Techniques are provided for vector noise cancellation. Different value combinations for a plurality of weighting factors may be established for a plurality of selection regions. Each value combination for the plurality of weighting factors may correspond to a different combination of a set of input signals. One or more characteristics of input signals may be used to select a particular selection region. A particular value combination of the set of weighting factors may be chosen to attenuate or amplify the input signals to generate one or more output signals.
    Type: Grant
    Filed: December 29, 2015
    Date of Patent: March 21, 2017
    Assignee: Dolby Laboratories Licensing Corporation
    Inventors: Jon C. Taenzer, Steven H. Puthuff
  • Patent number: 9602943
    Abstract: An audio processing method and apparatus are described. In one embodiment, at least one first sub-band of a first audio signal is suppressed to obtain a reduced first audio signal with reserved sub-bands; suppressing at least one second sub-band of the at least one second audio signal to obtain at least one reduced second audio signal with reserved sub-bands; and mixing the reduced first audio signal and at least one reduced second audio signal. Alternatively, a first spatial auditory property is assigned to a first audio signal so that the first audio signal may be perceived as originating from a first position. Alternatively, rhythmic similarity between at least two audio signals is detected, and time scaling is applied to an audio signal in response to relatively high rhythmic similarity between the audio signal and the other audio signal(s); and then at least two audio signals are mixed.
    Type: Grant
    Filed: March 21, 2013
    Date of Patent: March 21, 2017
    Assignee: Dolby Laboratories Licensing Corporation
    Inventors: Huiqun Deng, Xuejing Sun
  • Patent number: 9600827
    Abstract: RFID data is utilized for billing and management of 3D glasses in a cinema theater or group of theaters. RFID pedestals identify privately owned or rented 3D glasses brought into a theater by a customer. An invoice is automatically generated billing the theater operator for the use of the 3D glasses. Usage of the glasses along with other data collected about the customers is utilized for targeted advertising (e.g., e-mails, texts, selected advertise in pre-show, etc.). The invention reduces up front cost in installing a reusable 3D glasses system.
    Type: Grant
    Filed: April 4, 2012
    Date of Patent: March 21, 2017
    Assignee: Dolby Laboratories Licensing Corporation
    Inventor: Andrew Healy
  • Publication number: 20170076731
    Abstract: A method performed in an audio decoder for decoding M encoded audio channels representing N audio channels is disclosed. The method includes receiving a bitstream containing the M encoded audio channels and a set of spatial parameters, decoding the M encoded audio channels, and extracting the set of spatial parameters from the bitstream. The method also includes analyzing the M audio channels to detect a location of a transient, decorrelating the M audio channels, and deriving N audio channels from the M audio channels and the set of spatial parameters. A first decorrelation technique is applied to a first subset of each audio channel and a second decorrelation technique is applied to a second subset of each audio channel. The first decorrelation technique represents a first mode of operation of a decorrelator, and the second decorrelation technique represents a second mode of operation of the decorrelator.
    Type: Application
    Filed: November 4, 2016
    Publication date: March 16, 2017
    Applicant: Dolby Laboratories Licensing Corporation
    Inventor: Mark F. Davis
  • Publication number: 20170078823
    Abstract: Embodiments are described for a method of rendering an audio program by receiving, in a renderer of a playback system, the audio program and a target response representing desired characteristics of the playback environment, deriving a playback environment response based on characteristics of the playback environment, comparing the target response to the playback environment response to generate a set of correction settings, and applying the correction settings to the audio program so that the audio program is rendered according to the characteristics of the target response. The target response may be based on audio characteristics in a creation environment.
    Type: Application
    Filed: September 8, 2016
    Publication date: March 16, 2017
    Applicant: Dolby Laboratories Licensing Corporation
    Inventor: Charles Q. Robinson
  • Publication number: 20170078724
    Abstract: A display management unit configured to provide a modified video signal for display on a target display over an electronic distribution network. The unit may access information regarding the target display and at least one input. The unit comprises a database interface configured to retrieve display characteristics corresponding to the information regarding the target display from a characteristics database, and a mapping unit configured to map at least one of tone and color values from the at least one input to corresponding mapped values based at least in part on the retrieved display characteristics to produce the modified video signal.
    Type: Application
    Filed: November 22, 2016
    Publication date: March 16, 2017
    Applicant: Dolby Laboratories Licensing Corporation
    Inventors: William Brent WILSON, Robin ATKINS
  • Publication number: 20170078791
    Abstract: A spatial adaptation system for multiple-microphone sound capture systems and methods thereof are described. A spatial adaptation system includes an inference and weight module configured to receive a inputs. The inputs based on two or more input signals captured by at least two microphones. The inference and weight module to determine one or more weight values base on at least one of the inputs. The spatial adaptation system also including a noise magnitude ratio update module coupled with the inference and weight module. The noise magnitude ratio update module to determine an updated noise target based on the one or more weight values from the inference and weight module.
    Type: Application
    Filed: November 23, 2016
    Publication date: March 16, 2017
    Applicant: DOLBY INTERNATIONAL AB
    Inventor: Leif Jonas SAMUELSSON
  • Publication number: 20170078488
    Abstract: In an audio conferencing mixing system of the type taking a plurality of audio input streams of input audio information of conference participants, including mixing transition events and outputting a plurality of audio output streams including output audio information, a method of mixing the audio output streams so as to reduce the detectability of the mixing transition events, the method including the steps of (a) determining that a transition event is to occur; (b) determining that a masking trigger is to occur; (c) scheduling the transition event to substantially occur when the masking event occurs. Change blindness mechanism to mask changes in audio conference mix and maintain perceptual continuity.
    Type: Application
    Filed: February 17, 2015
    Publication date: March 16, 2017
    Applicant: Dolby Laboratories Licensing Corporation
    Inventors: Richard J. CARTWRIGHT, Glenn N. DICKINS
  • Publication number: 20170078628
    Abstract: Dual or multi-modulation display systems comprising a first modulator and a second modulator are disclosed. The first modulator may comprise a plurality of analog mirrors (e.g. MEMS array) and the second modulator may comprise a plurality of mirrors (e.g., DMD array). The display system may further comprise a controller that sends control signals to the first and second modulator. The display system may render highlight features within a projected image by affecting a time multiplexing scheme. In one embodiment, the first modulator may be switched on a sub-frame basis such that a desired proportion of the available light may be focused or directed onto the second modulator to form the highlight feature on a sub-frame rendering basis.
    Type: Application
    Filed: November 22, 2016
    Publication date: March 16, 2017
    Applicant: Dolby Laboratories Licensing Corporation
    Inventor: Martin J. Richards
  • Patent number: 9595270
    Abstract: In one aspect, the invention provides an audio encoding method characterized by a decision being made as to whether the device which will decode the resulting bit stream should apply post filtering including attenuation of interharmonic noise. Hence, the decision whether to use the post filter, which is encoded in the bit stream, is taken separately from the decision as to the most suitable coding mode. In another aspect, there is provided an audio decoding method with a decoding step followed by a post-filtering step, including interharmonic noise attenuation, and being characterized in a step of disabling the post filter in accordance with post filtering information encoded in the bit stream signal. Such a method is well suited for mixed-origin audio signals by virtue of its capability to deactivate the post filter in dependence of the post filtering information only, hence independently of factors such as the current coding mode.
    Type: Grant
    Filed: April 27, 2016
    Date of Patent: March 14, 2017
    Assignee: Dolby International AB
    Inventors: Barbara Resch, Kristofer Kjörling, Lars Villemoes
  • Publication number: 20170069334
    Abstract: An apparatus and method are disclosed for filtering and performing high frequency reconstruction of an audio signal. The apparatus includes an analysis filter bank, a high frequency reconstructor, and a synthesis filter bank. The analysis filterbank receives real-valued time domain input audio samples and generates complex valued subband samples. The high frequency reconstructor modifies at least some of the complex valued subband samples. The synthesis filter bank receives the modified complex valued subband samples and generates time domain output audio samples. The analysis filter bank comprises analysis filters that are complex exponential modulated versions of a prototype filter with an arbitrary phase shift.
    Type: Application
    Filed: November 17, 2016
    Publication date: March 9, 2017
    Applicant: Dolby International AB
    Inventor: Per Ekstrand
  • Publication number: 20170070211
    Abstract: The document relates to modulated sub-sampled digital filter banks, as well as to methods and systems for the design of such filter banks. In particular, the present document proposes a method and apparatus for the improvement of low delay modulated digital filter banks. The method employs modulation of an asymmetric low-pass prototype filter and a new method for optimizing the coefficients of this filter. Further, a specific design for a 64 channel filter bank using a prototype filter length of 640 coefficients and a system delay of 319 samples is given. The method substantially reduces artifacts due to aliasing emerging from independent modifications of subband signals, for example when using a filter bank as a spectral equalizer. The method is preferably implemented in software, running on a standard PC or a digital signal processor (DSP), but can also be hardcoded on a custom chip.
    Type: Application
    Filed: November 17, 2016
    Publication date: March 9, 2017
    Applicant: Dolby International AB
    Inventor: Per Ekstrand
  • Publication number: 20170070615
    Abstract: In an audio teleconference mixing system, of the type mixing a first plurality of audio uplink input streams containing audio information including sensed audio and associated control information, to produce at least one audio downlink output stream for downlinking to at least one conference participants, wherein the audio uplink input streams potentially can include continuous transmission (CTX) and discontinuous transmission streams (DTX), a method of mixing multiple current audio uplink streams together to produce the at least one audio output stream, the method including the steps of: (a) determining a verbosity measure indicative of the likely importance of each current audio uplink streams; (b) where at least one current audio uplink stream can comprise a CTX stream, utilising at least one CTX stream in the mix to produce at least one current downlink output stream.
    Type: Application
    Filed: February 17, 2015
    Publication date: March 9, 2017
    Applicant: DOLBY LABORATORIES LICENSING CORPORATION
    Inventor: Richard J. CARTRIGHT
  • Patent number: 9591321
    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 7, 2013
    Date of Patent: March 7, 2017
    Assignee: DOLBY INTERNATIONAL AB
    Inventor: Sachin G. Deshpande
  • Patent number: 9589571
    Abstract: Conventional audio compression technologies perform a standardized signal transformation, independent of the type of the content. Multi-channel signals are decomposed into their signal components, subsequently quantized and encoded. This is disadvantageous due to lack of knowledge on the characteristics of scene composition, especially for e.g. multi-channel audio or Higher-Order Ambisonics (HOA) content. An improved method for encoding pre-processed audio data comprises encoding the pre-processed audio data, and encoding auxiliary data that indicate the particular audio pre-processing. An improved method for decoding encoded audio data comprises determining that the encoded audio data had been pre-processed before encoding, decoding the audio data, extracting from received data information about the pre-processing, and post-processing the decoded audio data according to the extracted pre-processing information.
    Type: Grant
    Filed: July 19, 2013
    Date of Patent: March 7, 2017
    Assignee: Dolby Laboratories Licensing Corporation
    Inventors: Olivier Wuebbolt, Johannes Boehm, Peter Jax
  • Patent number: 9591317
    Abstract: A system for decoding a video bitstream includes receiving a frame of the video that includes at least one slice and at least one tile and where each of the at least one slice and the at least one tile are not all aligned with one another.
    Type: Grant
    Filed: August 15, 2016
    Date of Patent: March 7, 2017
    Assignee: DOLBY INTERNATIONAL AB
    Inventor: Sachin G. Deshpande
  • Publication number: 20170061974
    Abstract: A method for encoding multi-channel HOA audio signals for noise reduction comprises steps of decorrelating the channels using an inverse adaptive DSHT, the inverse adaptive DSHT comprising a rotation operation and an inverse DSHT, with the rotation operation rotating the spatial sampling grid of the iDSHT, perceptually encoding each of the decorrelated channels, encoding rotation information, the rotation information comprising parameters defining said rotation operation, and transmitting or storing the perceptually encoded audio channels and the encoded rotation information.
    Type: Application
    Filed: September 26, 2016
    Publication date: March 2, 2017
    Applicant: DOLBY INTERNATIONAL AB
    Inventors: Johannes BOEHM, Sven KORDON, Alexander KRÜGER, Peter JAX
  • Publication number: 20170061982
    Abstract: A device (160) and a method are proposed for tuning a frequency-dependent attenuation stage (122),with the purpose of suppressing non-linear distortion occurring in an audio reproduction system (120) associated with the frequency-dependent attenuation stage. The device comprises a receiving section (162) adapted to receive data representing an output acoustic signal (140) from the audio reproduction system,recorded upon excitation of the audio reproduction system by a predetermined input data signal (110)a first distortion detection section (163) adapted to detect presence of non-linear distortion based on the received data and to apply psycho-acoustic compensation to the detected non-linear distortion and a control section (164) adapted to determine, based on the psycho-acoustically compensated non-linear distortion, control information (170) suitable for controlling the frequency-dependent attenuation stage.
    Type: Application
    Filed: February 18, 2015
    Publication date: March 2, 2017
    Applicants: DOLBY INTERNATIONAL AB, DOLBY LABORATORIES LICENSING CORPORATION
    Inventors: Jyri Tapani PAKARINEN, Michael SMITHERS, Juan Felix TORRES, Heiko PURNHAGEN
  • Patent number: 9584816
    Abstract: Methods, systems, and computer programs for improving compressed image chroma information. In one aspect of the invention, a resolution for a red color component of a color video image is used that is higher than the resolution for a blue color component of the color video image. Another aspect includes utilizing a lower or higher value of a quantization parameter (QP) for one or more chroma channels as compared to the luminance channel. Another aspect is use of a logarithmic representation of a video image to benefit image coding. Another aspect uses more than two chroma channels to represent a video image.
    Type: Grant
    Filed: August 3, 2011
    Date of Patent: February 28, 2017
    Assignee: Dolby Laboratories Licensing Corporation
    Inventor: Gary A. Demos
  • Patent number: 9584813
    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 22, 2016
    Date of Patent: February 28, 2017
    Assignee: DOLBY INTERNATIONAL AB
    Inventors: Yeping Su, Christopher A. Segall
  • Patent number: 9584784
    Abstract: Dual and multi-modulator projector display systems and techniques are disclosed. In one embodiment, a projector display system comprises a light source; a controller, a first modulator, receiving light from the light source and rendering a halftone image of said the input image; a blurring optical system that blurs said halftone image with a Point Spread Function (PSF); and a second modulator receiving the blurred halftone image and rendering a pulse width modulated image which may be projected to form the desired screen image. Systems and techniques for forming a binary halftone image from input image, correcting for misalignment between the first and second modulators and calibrating the projector system—e.g. over time—for continuous image improvement are also disclosed.
    Type: Grant
    Filed: August 13, 2014
    Date of Patent: February 28, 2017
    Assignee: Dolby Laboratories Licensing Corporation
    Inventor: Jerome Shields
  • Patent number: 9584087
    Abstract: A method, an apparatus, and logic to post-process raw gains determined by input processing to generate post-processed gains, comprising using one or both of delta gain smoothing and decision-directed gain smoothing. The delta gain smoothing comprises applying a smoothing filter to the raw gain with a smoothing factor that depends on the gain delta: the absolute value of the difference between the raw gain for the current frame and the post-processed gain for a previous frame. The decision-directed gain smoothing comprises converting the raw gain to a signal-to-noise ratio, applying a smoothing filter with a smoothing factor to the signal-to-noise ratio to calculate a smoothed signal-to-noise ratio, and converting the smoothed signal-to-noise ratio to determine the second smoothed gain, with smoothing factor possibly dependent on the gain delta.
    Type: Grant
    Filed: March 21, 2013
    Date of Patent: February 28, 2017
    Assignee: Dolby Laboratories Licensing Corporation
    Inventors: Xuejing Sun, Glenn N. Dickins
  • Patent number: 9584811
    Abstract: An encoder receives an input enhanced dynamic range (EDR) image to be coded in a layered representation. Input images may be gamma-coded or perceptually-coded using a bit-depth format not supported by one or more video encoders. The input image is remapped to one or more quantized layers to generate output code words suitable for compression using the available video encoders. Algorithms to determine optimum function parameters for linear and non-linear mapping functions are presented. Given a mapping function, the reverse mapping function may be transmitted to a decoder as a look-up table or it may be approximated using a piecewise polynomial approximation. A polynomial approximation technique for representing reverse-mapping functions and chromaticity translation schemes to reduce color shifts are also presented.
    Type: Grant
    Filed: June 16, 2014
    Date of Patent: February 28, 2017
    Assignee: Dolby Laboratories Licensing Corporation
    Inventor: Guan-Ming Su
  • Patent number: 9584083
    Abstract: Scaling, by a desired amount sm, the overall perceived loudness Lm of a multichannel audio signal, wherein perceived loudness is a nonlinear function of signal power P, by scaling the perceived loudness of each individual channel Lc by an amount substantially equal to the desired amount of scaling of the overall perceived loudness of all channels sm, subject to accuracy in calculations and the desired accuracy of the overall perceived loudness scaling sm. The perceived loudness of each individual channel may be scaled by changing the gain of each individual channel, wherein gain is a scaling of a channel's power. Optionally, in addition, the loudness scaling applied to each channel may be modified so as to reduce the difference between the actual overall loudness scaling and the desired amount of overall loudness scaling.
    Type: Grant
    Filed: March 31, 2014
    Date of Patent: February 28, 2017
    Assignee: Dolby Laboratories Licensing Corporation
    Inventors: Alan J. Seefeldt, Michael Smithers
  • Patent number: 9584786
    Abstract: A method and system for merging graphics and high dynamic range video data is disclosed. In a video receiver, if needed, video and graphics are translated first into the IPT-PQ color space. A display management process uses metadata to map the input video data and the graphics from their own color volume space into a target blending color volume space by taking into consideration the color volume space of the target display.
    Type: Grant
    Filed: November 10, 2015
    Date of Patent: February 28, 2017
    Assignee: Dolby Laboratories Licensing Corporation
    Inventors: Robin Atkins, Eldon Lee Rivers
  • Patent number: 9583118
    Abstract: An apparatus and method are disclosed for filtering and performing high frequency reconstruction of an audio signal. The apparatus includes an analysis filter bank, a high frequency reconstructor, and a synthesis filter bank. The analysis filterbank receives real-valued time domain input audio samples and generates complex valued subband samples. The high frequency reconstructor modifies at least some of the complex valued subband samples. The synthesis filter bank receives the modified complex valued subband samples and generates time domain output audio samples. The analysis filter bank comprises analysis filters that are complex exponential modulated versions of a prototype filter with an arbitrary phase shift.
    Type: Grant
    Filed: November 17, 2016
    Date of Patent: February 28, 2017
    Assignee: Dolby International AB
    Inventor: Per Ekstrand
  • Publication number: 20170054938
    Abstract: Methods and systems for controlling judder are disclosed. Judder can be introduced locally within a picture, to restore a judder feeling which is normally expected in films. Capture time and display time of frames can be manipulated to obtain a desired amount of judder. Frames can be interpolated to obtain a film with a higher frame rate and localized control of judder.
    Type: Application
    Filed: February 23, 2015
    Publication date: February 23, 2017
    Applicant: DOLBY LABORATORIES LICENSING CORPORATION
    Inventors: Ning XU, Kimball Darr THURSTON, III, Scott DALY, James E. CRENSHAW, Alfred SHE
  • Patent number: 9578334
    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: July 29, 2016
    Date of Patent: February 21, 2017
    Assignee: Dolby Laboratories Licensing Corporation
    Inventors: Stephen Gordon, Douglas Chin
  • Patent number: 9576555
    Abstract: Displays, display components, image and video processing apparatus and related methods are described. A method for driving local-dimming displays comprises generating control values for driving pixels of a spatial light modulator from one image data component and generating control values for driving backlight elements from a second image data component. The first and second image data components may respectively comprise a tone map and a ratio image. Control values for the spatial light modulator and/or backlight may be obtained using cost effective hardware.
    Type: Grant
    Filed: June 20, 2011
    Date of Patent: February 21, 2017
    Assignee: Dolby Laboratories Licensing Corporation
    Inventors: Ajit Ninan, Wenhui Jia
  • Patent number: 9578341
    Abstract: Methods, systems, and computer programs for improving compressed image chroma information. In one aspect of the invention, a resolution for a red color component of a color video image is used that is higher than the resolution for a blue color component of the color video image. Another aspect includes utilizing a lower or higher value of a quantization parameter (QP) for one or more chroma channels as compared to the luminance channel. Another aspect is use of a logarithmic representation of a video image to benefit image coding. Another aspect uses more than two chroma channels to represent a video image.
    Type: Grant
    Filed: August 3, 2011
    Date of Patent: February 21, 2017
    Assignee: Dolby Laboratories Licensing Corporation
    Inventor: Gary A. Demos
  • Publication number: 20170047071
    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: Application
    Filed: April 23, 2015
    Publication date: February 16, 2017
    Applicant: Dolby Laboratories Licensing Corporation
    Inventors: Vinay MELKOTE, Malcolm James LAW, Roy M. FEJGIN
  • Publication number: 20170048639
    Abstract: A method of decomposing a matrix of dimension L-by-N, where L is less than or equal to N, into a sequence of N-by-N unit primitive matrices and a permutation matrix comprising a sequence that is the product of the primitive matrices and the permutation matrix, containing L rows that are substantially close to the provided L-by-N matrix, where the choice of the permutation matrix and the indices of the non-trivial rows in the primitive matrices are chosen to limit the coefficient values in the primitive matrices.
    Type: Application
    Filed: April 23, 2015
    Publication date: February 16, 2017
    Applicant: DOLBY LABORATORIES LICENSING CORPORATION
    Inventors: Vinay MELKOTE, Malcolm James LAW
  • Patent number: 9570083
    Abstract: The present disclosure provides methods, devices and computer program products for encoding and decoding a stereo audio signal based on an input signal. According to the disclosure, a hybrid approach of using both parametric stereo coding and a discrete representation of the stereo audio signal is used which may improve the quality of the encoded and decoded audio for certain bitrates.
    Type: Grant
    Filed: April 4, 2014
    Date of Patent: February 14, 2017
    Assignee: Dolby International AB
    Inventors: Heiko Purnhagen, Kristofer Kjoerling
  • Patent number: 9571425
    Abstract: Voice communication method and apparatus and method and apparatus for operating jitter buffer are described. Audio blocks are acquired in sequence. Each of the audio blocks includes one or more audio frames. Voice activity detection is performed on the audio blocks. In response to deciding voice onset for a present one of the audio blocks, a subsequence of the sequence of the acquired audio blocks is retrieved. The subsequence precedes the present audio block immediately. The subsequence has a predetermined length and non-voice is decided for each audio block in the subsequence. The present audio block and the audio blocks in the subsequence are transmitted to a receiving party. The audio blocks in the subsequence are identified as reprocessed audio blocks. In response to deciding non-voice for the present audio block, the present audio block is cached.
    Type: Grant
    Filed: March 21, 2013
    Date of Patent: February 14, 2017
    Assignee: Dolby Laboratories Licensing Corporation
    Inventors: Glenn N. Dickins, Xuejing Sun, Brendon Costa
  • Patent number: 9571855
    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: June 22, 2016
    Date of Patent: February 14, 2017
    Assignee: Dolby Laboratories Licensing Corporation
    Inventor: Gary A. Demos
  • Publication number: 20170039690
    Abstract: Image data is adjusted for display on a target display. Maximum safe expansions for one or more attributes of the image data are compared to maximum available expansions for the attributes. An amount of expansion is selected that does not exceed either of the maximum safe expansion and the maximum available expansion. Artifacts caused by over expansion may be reduced or avoided.
    Type: Application
    Filed: October 24, 2016
    Publication date: February 9, 2017
    Applicant: Dolby Laboratories Licensing Corporation
    Inventors: Robin ATKINS, Steve MARGERM
  • Publication number: 20170039963
    Abstract: Dual modulator displays are disclosed incorporating a phosphorescent plate interposed in the optical path between a light source modulation layer and a display modulation layer. Spatially modulated light output from the light source modulation layer impinges on the phosphorescent plate and excites corresponding regions of the phosphorescent plate which in turn emit light having different spectral characteristics than the light output from the light source modulation layer. Light emitted from the phosphorescent plate is received and further modulated by the display modulation layer to provide the ultimate display output.
    Type: Application
    Filed: October 19, 2016
    Publication date: February 9, 2017
    Applicant: Dolby Laboratories Licensing Corporation
    Inventors: Lorne A. Whitehead, Gregory John Ward, Louis D. Silverstein, Helge Seetzen
  • Publication number: 20170041724
    Abstract: Embodiments are described for calibrating a speaker in a device having a microphone by inputting an original audio signal to a processing component and an output stage of the device for playback through the speakers, receiving playback sound output from the speakers through the microphone to generate a microphone signal, and inputting the microphone signal into the processing component to calibrate the speakers for optimal playback of the original audio signal, wherein the processing component is configured to compare the original audio signal to the microphone signal and correct the microphone signal by one or more audio processing functions in accordance with a refresh schedule.
    Type: Application
    Filed: August 3, 2016
    Publication date: February 9, 2017
    Applicant: Dolby Laboratories Licensing Corporation
    Inventors: Aaron Steven MASTER, Alan J. SEEFELDT, Yu Cecilia HOU
  • Patent number: 9565509
    Abstract: An audio object coder for generating an encoded object signal using a plurality of audio objects includes a downmix information generator for generating downmix information indicating a distribution of the plurality of audio objects into at least two downmix channels, an audio object parameter generator for generating object parameters for the audio objects, and an output interface for generating the imported audio output signal using the downmix information and the object parameters. An audio synthesizer uses the downmix information for generating output data usable for creating a plurality of output channels of the predefined audio output configuration.
    Type: Grant
    Filed: October 5, 2007
    Date of Patent: February 7, 2017
    Assignee: DOLBY INTERNATIONAL AB
    Inventors: Jonas Engdegard, Lars Villemoes, Heiko Purnhagen, Barbara Resch
  • Patent number: 9565314
    Abstract: The present document relates to audio conference systems. In particular, the present document relates to the mapping of soundfields within an audio conference system. A conference multiplexer (110, 175, 210, 400) configured to place a first input soundfield signal (402) originating from a first soundfield endpoint (120, 170) within a 2D or 3D conference scene (300) to be rendered to a listener (301) is described. The first input soundfield signal (402) is indicative of a soundfield captured by the first soundfield endpoint (120, 170).
    Type: Grant
    Filed: September 25, 2013
    Date of Patent: February 7, 2017
    Assignee: Dolby Laboratories Licensing Corporation
    Inventors: Richard J. Cartwright, David S. McGrath, Glenn N. Dickins
  • Patent number: D780150
    Type: Grant
    Filed: May 8, 2015
    Date of Patent: February 28, 2017
    Assignee: Dolby Laboratories Licensing Corporation
    Inventors: Andrew Border, Christopher Bennett, Thao D. Hovanky, David Clementson, Jeffrey William Smith, Venugopal Kalluri, Lucas E. Saule, Peter Michaelian, Quinn S. Huffstetler, Charles K. Ambler