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: 20170215020
    Abstract: Embodiments are described for an adaptive audio system that processes audio data comprising a number of independent monophonic audio streams. One or more of the streams has associated with it metadata that specifies whether the stream is a channel-based or object-based stream. Channel-based streams have rendering information encoded by means of channel name; and the object-based streams have location information encoded through location expressions encoded in the associated metadata. A codec packages the independent audio streams into a single serial bitstream that contains all of the audio data. This configuration allows for the sound to be rendered according to an allocentric frame of reference, in which the rendering location of a sound is based on the characteristics of the playback environment (e.g., room size, shape, etc.) to correspond to the mixer's intent.
    Type: Application
    Filed: April 10, 2017
    Publication date: July 27, 2017
    Applicant: Dolby Laboratories Licensing Corporation
    Inventors: Charles Q. ROBINSON, Nicolas R. TSINGOS, Christophe CHABANNE
  • Publication number: 20170214917
    Abstract: Techniques are provided to encode and decode image data comprising a tone mapped (TM) image with HDR reconstruction data in the form of luminance ratios and color residual values. In an example embodiment, luminance ratio values and residual values in color channels of a color space are generated on an individual pixel basis based on a high dynamic range (HDR) image and a derivative tone-mapped (TM) image that comprises one or more color alterations that would not be recoverable from the TM image with a luminance ratio image. The TM image with HDR reconstruction data derived from the luminance ratio values and the color-channel residual values may be outputted in an image file to a downstream device, for example, for decoding, rendering, and/or storing. The image file may be decoded to generate a restored HDR image free of the color alterations.
    Type: Application
    Filed: April 7, 2017
    Publication date: July 27, 2017
    Applicant: Dolby Laboratories Licensing Corporation
    Inventors: Wenhui JIA, Ajit NINAN, Arkady TEN, Gregory John WARD
  • Publication number: 20170215019
    Abstract: Embodiments of the example embodiment relate to audio object extraction. A method for audio object extraction from audio content is disclosed. The method comprises determining a sub-band object probability for a sub-band of the audio signal in a frame of the audio content, the sub-band object probability indicating a probability of the sub-band of the audio signal containing an audio object. The method further comprises splitting the sub-band of the audio signal into an audio object portion and a residual audio portion based on the determined sub-band object probability. Corresponding system and computer program product are also disclosed.
    Type: Application
    Filed: July 23, 2015
    Publication date: July 27, 2017
    Applicant: Dolby Laboratories Licensing Corporation
    Inventors: Lianwu CHEN, Lie LU
  • Publication number: 20170213566
    Abstract: Many portable playback devices cannot decode and playback encoded audio content having wide bandwidth and wide dynamic range with consistent loudness and intelligibility unless the encoded audio content has been prepared specially for these devices. This problem can be overcome by including with the encoded content some metadata that specifies a suitable dynamic range compression profile by either absolute values or differential values relative to another known compression profile. A playback device may also adaptively apply gain and limiting to the playback audio. Implementations in encoders, in transcoders and in decoders are disclosed.
    Type: Application
    Filed: April 7, 2017
    Publication date: July 27, 2017
    Applicants: DOLBY INTERNATIONAL AB, Dolby Laboratories Licensing Corporation
    Inventors: Jeffrey Riedmiller, Harald Mundt, Michael Schug, Martin Wolters
  • Publication number: 20170214916
    Abstract: A processor for forward reshaping to a target bit depth receives an input image with an input bit depth. The input luminance range is divided into luminance bands and each band is assigned a visual importance index. The output codewords at the target bit depth are divided into codeword bins and each bin is assigned to one of the luminance bands. Each codeword bin is assigned the visual importance index of the luminance band it belongs. Each bin is allocated a number of reshaped codewords according to its visual importance index and a codeword mapping function, where bins with the highest importance index are allocated more codewords than the other bins. A signal reshaping function is generated based on the allocation of codewords, and the reshaping function is applied to the input image to generate an output image in the target bit depth.
    Type: Application
    Filed: January 19, 2017
    Publication date: July 27, 2017
    Applicant: DOLBY LABORATORIES LICENSING CORPORATION
    Inventors: Taoran LU, Fangjun PU, Peng YIN, Tao CHEN, Walter J. HUSAK
  • Publication number: 20170213540
    Abstract: The disclosure relates to combined active noise cancellation and noise compensation in a headphone. An audio processing device includes a selector and a noise compensation unit. The selector can select one of a plurality of first transfer functions based on at least one feature of at least one of an external noise and a content audio signal representing a sound to be reproduced through the headphone. The noise compensation unit can compute a second audio signal by applying the selected first transfer function to a first audio signal, and derive gains for the noise compensation at least based on the second audio signal. The at least one feature can be used to distinguish at least two of the first transfer functions. Each of the first transfer functions can transform the first audio signal to the second audio signal which is assumed as representing a version of the sound represented by the first audio signal, which arrives at an eardrum of a listener wearing the headphone.
    Type: Application
    Filed: September 30, 2015
    Publication date: July 27, 2017
    Applicant: Dolby Laboratories Licensing Corporation
    Inventors: Guilin MA, Xiguang ZHENG
  • Publication number: 20170213563
    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: Application
    Filed: April 6, 2017
    Publication date: July 27, 2017
    Applicant: DOLBY INTERNATIONAL AB
    Inventor: Lars VILLEMOES
  • Patent number: 9715881
    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 phase shifter, 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 phase shifter shifts a phase of the complex-valued subband samples by an arbitrary amount. The high frequency reconstructor modifies at least some of the complex valued subband samples. A phase shifter unshifts a phase of the modified complex-valued subband samples by the arbitrary amount. 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: April 4, 2017
    Date of Patent: July 25, 2017
    Assignee: Dolby International AB
    Inventor: Per Ekstrand
  • Patent number: 9715880
    Abstract: The present document relates to audio coding systems. In particular, the present document relates to efficient methods and systems for parametric multi-channel audio coding. An audio encoding system (500) configured to generate a bitstream (564) indicative of a downmix signal and spatial metadata for generating a multi-channel upmix signal from the downmix signal is described. The system (500) comprises a downmix processing unit (510) configured to generate the downmix signal from a multi-channel input signal (561); wherein the downmix signal comprises m channels and wherein the multi-channel input signal (561) comprises n channels; n, m being integers with m<n. Furthermore, the system (500) comprises a parameter processing unit (520) configured to determine the spatial metadata from the multi-channel input signal (561).
    Type: Grant
    Filed: February 21, 2014
    Date of Patent: July 25, 2017
    Assignee: Dolby International AB
    Inventors: Tobias Friedrich, Alexander Mueller, Karsten Linzmeier, Claus-Christian Spenger, Tobias R. Wagenblass
  • Patent number: 9716486
    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 phase shifter, 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 phase shifter shifts a phase of the complex-valued subband samples by an arbitrary amount. The high frequency reconstructor modifies at least some of the complex valued subband samples. A phase shifter unshifts a phase of the modified complex-valued subband samples by the arbitrary amount. 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: March 22, 2017
    Date of Patent: July 25, 2017
    Assignee: Dolby International AB
    Inventor: Per Ekstrand
  • Patent number: 9715882
    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: Grant
    Filed: February 1, 2017
    Date of Patent: July 25, 2017
    Assignee: Dolby Laboratories Licensing Corporation
    Inventor: Mark F. Davis
  • Patent number: 9716887
    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: Grant
    Filed: December 6, 2016
    Date of Patent: July 25, 2017
    Assignee: Dolby Laboratories Licensing Corporation
    Inventors: Robin Atkins, Jon Scott Miller
  • Publication number: 20170206907
    Abstract: Example embodiments disclosed herein relate to signal processing. A method for decomposing a plurality of audio signals from at least two different channels is disclosed. The method comprises obtaining a set of components that are weakly correlated, the set of components generated based on the plurality of audio signals. The method comprises extracting a feature from the set of components, and determining a set of gains associated with the set of components at least in part based on the extracted feature, each of the gains indicating a proportion of a diffuse part in the associated component. The method further comprises decomposing the plurality of audio signals by applying the set of gains to the set of components. Corresponding system and computer program product are also disclosed.
    Type: Application
    Filed: July 14, 2015
    Publication date: July 20, 2017
    Applicant: DOLBY LABORATORIES LICENSING CORPORATION
    Inventors: Jun WANG, Lie LU
  • Publication number: 20170206909
    Abstract: According to an aspect of the present invention, a method for reconstructing an audio signal having a baseband portion and a highband portion is disclosed. The method includes obtaining a decoded baseband audio signal by decoding an encoded audio signal and obtaining a plurality of subband signals by filtering the decoded baseband audio signal. The method further includes generating a high-frequency reconstructed signal by copying a number of consecutive subband signals of the plurality of subband signals and obtaining an envelope adjusted high-frequency signal. The method further includes generating a noise component based on a noise parameter. Finally, the method includes adjusting a phase of the high-frequency reconstructed signal and obtaining a time-domain reconstructed audio signal by combining the decoded baseband audio signal and the combined high-frequency signal to obtain a time-domain reconstructed audio signal.
    Type: Application
    Filed: March 30, 2017
    Publication date: July 20, 2017
    Applicant: Dolby Laboratories Licensing Corporation
    Inventors: Michael M. Truman, Mark S. Vinton
  • Publication number: 20170206911
    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 phase shifter, 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 phase shifter shifts a phase of the complex-valued subband samples by an arbitrary amount. The high frequency reconstructor modifies at least some of the complex valued subband samples. A phase shifter unshifts a phase of the modified complex-valued subband samples by the arbitrary amount. 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: April 4, 2017
    Publication date: July 20, 2017
    Applicant: Dolby International AB
    Inventor: Per Ekstrand
  • Publication number: 20170208105
    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: Application
    Filed: January 17, 2017
    Publication date: July 20, 2017
    Applicant: Dolby Laboratories Licensing Corporation
    Inventors: Rowan James KATEKAR, Glenn N. DICKINS
  • Publication number: 20170206910
    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 phase shifter, 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 phase shifter shifts a phase of the complex-valued subband samples by an arbitrary amount. The high frequency reconstructor modifies at least some of the complex valued subband samples. A phase shifter unshifts a phase of the modified complex-valued subband samples by the arbitrary amount. 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: April 4, 2017
    Publication date: July 20, 2017
    Applicant: Dolby International AB
    Inventor: Per Ekstrand
  • Publication number: 20170208412
    Abstract: The invention improves HOA sound field representation compression. The HOA representation is analysed for the presence of dominant sound sources and their directions are estimated. Then the HOA representation is decomposed into a number of dominant directional signals and a residual component. This residual component is transformed into the discrete spatial domain in order to obtain general plane wave functions at uniform sampling directions, which are predicted from the dominant directional signals. Finally, the prediction error is transformed back to the HOA domain and represents the residual ambient HOA component for which an order reduction is performed, followed by perceptual encoding of the dominant directional signals and the residual component.
    Type: Application
    Filed: February 16, 2017
    Publication date: July 20, 2017
    Applicant: DOLBY LABORATORIES LICENSING CORPORATION
    Inventors: Alexander KRUEGER, Sven KORDON, Johannes BOEHM
  • Publication number: 20170208409
    Abstract: A computer implemented system for rendering captured audio soundfields to a listener comprises apparatus to deliver the audio soundfields to the listener. The delivery apparatus delivers the audio soundfields to the listener with first and second audio elements perceived by the listener as emanating from first and second virtual source locations, respectively, and with the first audio element and/or the second audio element delivered to the listener from a third virtual source location. The first virtual source location and the second virtual source location are perceived by the listener as being located to the front of the listener, and the third virtual source location is located to the rear or the side of the listener.
    Type: Application
    Filed: April 5, 2017
    Publication date: July 20, 2017
    Applicant: Dolby Laboratories Licensing Corporation
    Inventors: Richard J. CARTWRIGHT, David S. MCGRATH, Glenn N. DICKINS
  • Publication number: 20170208392
    Abstract: Embodiments are directed to a virtual height filter for use with or in an upward-firing speaker system that reflects sound off a ceiling to a listening location at a distance from a speaker, and that provides height cues to reproduce audio objects that have overhead audio components. A virtual height filter based on a directional hearing model is applied to the upward-firing driver signal to improve the perception of height for audio signals transmitted by the virtual height speaker to provide optimum reproduction of the overhead reflected sound. The virtual height filter is provided by any one or combination of analog or digital filter circuits, or mechanical structures including speaker grill, enclosure, or driver design or configuration.
    Type: Application
    Filed: June 2, 2015
    Publication date: July 20, 2017
    Applicant: Dolby Laboratories Licensing Corporation
    Inventors: Michael J. SMITHERS, Brett G. CROCKETT, Alan J. SEEFELDT, C. Phillip BROWN
  • Patent number: 9712801
    Abstract: Stereoscopic images are subsampled and placed in a “checkerboard” pattern in an image. The image is encoded in a monoscopic video format. The monoscopic video is transmitted to a device where the “checkerboard” is decoded. Portions of the checkerboard (e.g., “black” portions) are used to reconstruct one of the stereoscopic images and the other portion of the checkerboard (e.g., “white” portions) are used to reconstruct the other image. The subsamples are, for example, taken from the image in a location coincident to the checkerboard position in which the subsamples are encoded.
    Type: Grant
    Filed: November 16, 2015
    Date of Patent: July 18, 2017
    Assignee: Dolby Laboratories Licensing Corporation
    Inventors: Walter J. Husak, David Ruhoff, Alexandros Tourapis, Athanasios Leontaris
  • Patent number: 9712939
    Abstract: A gain contribution of the audio signal for each of the N audio objects to at least one of M speakers may be determined. Determining the gain contribution may involve determining a center of loudness position that is a function of speaker (or cluster) positions and gains assigned to each speaker (or cluster). Determining the gain contribution also may involve determining a minimum value of a cost function. A first term of the cost function may represent a difference between the center of loudness position and an audio object position.
    Type: Grant
    Filed: June 17, 2014
    Date of Patent: July 18, 2017
    Assignees: Dolby Laboratories Licensing Corporation, Dolby International AB
    Inventors: Antonio Mateos Sole, Giulio Cengarle, Dirk Jeroen Breebart, Nicolas R. Tsingos
  • Patent number: 9711096
    Abstract: Several embodiments of display systems that use narrowband emitters are disclosed herein. In one embodiment, a display system comprises, for at least one primary color, a plurality of narrowband emitters distributed around the primary color point. The plurality of narrowband emitters provides a more regular power vs. spectral distribution in a desired band of frequencies.
    Type: Grant
    Filed: August 3, 2015
    Date of Patent: July 18, 2017
    Assignee: Dolby Laboratories Licensing Corporation
    Inventors: Eric Kozak, Scott Daly
  • Patent number: 9710215
    Abstract: In an embodiment, a first display monitor communicates with a second display monitor to determine a common set of display capabilities that are supported by both the first display monitor and the second display monitor. One or more first color grading instructions for one or more first images are received from a first user. In response to receiving the one or more first color grading instructions, the one or more first images are color graded with the one or more first color grading instructions to generate one or more first color graded images. The one or more first color graded images are rendered on the first display monitor. In addition, the one or more first color graded images are caused to be rendered on the second display monitor.
    Type: Grant
    Filed: March 25, 2015
    Date of Patent: July 18, 2017
    Assignee: Dolby Laboratories Licensing Corporation
    Inventor: Ajit Ninan
  • Patent number: 9712834
    Abstract: In an embodiment, a control map of false contour filtering is generated for a predicted image. The predicted image is predicted from a low dynamic range image mapped from the wide dynamic range image. Based at least in part on the control map of false contour filtering and the predicted image, one or more filter parameters for a sparse finite-impulse-response (FIR) filter are determined. The sparse FIR filter is applied to filter pixel values in a portion of the predicted image based at least in part on the control map of false contour filtering. The control map of false contour filtering is encoded into a part of a multi-layer video signal that includes the low dynamic range image.
    Type: Grant
    Filed: September 17, 2014
    Date of Patent: July 18, 2017
    Assignee: Dolby Laboratories Licensing Corporation
    Inventors: Guan-Ming Su, Qian Chen, Peng Yin, Sheng Qu
  • Patent number: 9711111
    Abstract: An HDR display is a combination of technologies including, for example, a dual modulation architecture incorporating algorithms for artifact reduction, selection of individual components, and a design process for the display and/or pipeline for preserving the visual dynamic range from capture to display of an image or images. In one embodiment, the dual modulation architecture includes a backlight with an array of RGB LEDs and a combination of a heat sink and thermally conductive vias for maintaining a desired operating temperature.
    Type: Grant
    Filed: June 4, 2013
    Date of Patent: July 18, 2017
    Assignee: Dolby Laboratories Licensing Corporation
    Inventor: Robin Atkins
  • Patent number: 9712796
    Abstract: Methods and systems for color grading video content are presented. A component (e.g. a frame, a shot and/or a scene) of the video content is designated to be a master component and one or more other components of the video content are designated to be slave components, each slave component associated with the master component. A master component color grading operation is performed to the master component. For each one of the slave components, the master component color grading operation is performed to the slave component and a slave color grading operation that is specific to the one of the slave components is also performed. Metadata, which form part of the video content, are created to provide indicators on to whether components of the video are designated as master or slave components.
    Type: Grant
    Filed: April 8, 2015
    Date of Patent: July 18, 2017
    Assignee: Dolby Laboratories Licensing Corporation
    Inventors: Peter W. Longhurst, William Brent Wilson
  • Patent number: 9712938
    Abstract: The invention discloses rendering sound field signals, such as Higher-Order Ambisonics (HOA), for arbitrary loudspeaker setups, where the rendering results in highly improved localization properties and is energy preserving. This is obtained by a new type of decode matrix for sound field data, and a new way to obtain the decode matrix. In a method for rendering an audio sound field representation for arbitrary spatial loudspeaker setups, the decode matrix for the rendering to a given arrangement of target loudspeakers is obtained by steps of obtaining a number of target speakers, their positions, positions of a spherical modeling grid and a HOA order, generating a mix matrix from the positions of the modeling grid and the positions of the speakers, generating a mode matrix from the positions of the spherical modeling grid and the HOA order, calculating a first decode matrix from the mix matrix and the mode matrix, and smoothing and scaling the first decode matrix with smoothing and scaling coefficients.
    Type: Grant
    Filed: July 16, 2013
    Date of Patent: July 18, 2017
    Assignee: Dolby Laboratories Licensing Corporation
    Inventors: Johannes Boehm, Florian Keiler
  • Publication number: 20170201221
    Abstract: The invention relates to the measurement and control of the perceived sound loudness and/or the perceived spectral balance of an audio signal. An audio signal is modified in response to calculations performed at least in part in the perceptual (psychoacoustic) loudness domain. The invention is useful, for example, in one or more of: loudness-compensating volume control, automatic gain control, dynamic range control (including, for example, limiters, compressors, expanders, etc.), dynamic equalization, and compensating for background noise interference in an audio playback environment. The invention includes not only methods but also corresponding computer programs and apparatus.
    Type: Application
    Filed: March 27, 2017
    Publication date: July 13, 2017
    Applicant: Dolby Laboratories Licensing Corporation
    Inventor: Alan Jeffrey Seefeldt
  • Patent number: 9704493
    Abstract: The present disclosure provides methods, devices and computer program products for encoding and decoding of a vector of parameters in an audio coding system. The disclosure further relates to a method and apparatus for reconstructing an audio object in an audio decoding system. According to the disclosure, a modulo differential approach for coding and encoding a vector of a non-periodic quantity may improve the coding efficiency and provide encoders and decoders with less memory requirements. Moreover, an efficient method for encoding and decoding a sparse matrix is provided.
    Type: Grant
    Filed: May 23, 2014
    Date of Patent: July 11, 2017
    Assignee: Dolby International AB
    Inventors: Leif Jonas Samuelsson, Heiko Purnhagen
  • Patent number: 9704274
    Abstract: Several embodiments of display systems that have wide color gamut performance are disclosed herein. In one embodiment, a display system comprises a plurality of emitters, said emitters emanating light into an optical path; a first modulator, said first modulator comprising a plurality of colored subpixels and wherein said first modulator transmitting light emanating from said emitters in said optical path; and a color notch filter, said color notch filter placed in said optical path for conditioning or convolving light together with said first modulator.
    Type: Grant
    Filed: June 17, 2016
    Date of Patent: July 11, 2017
    Assignee: Dolby Laboratories Licensing Corporation
    Inventor: John Gilbert
  • Patent number: 9704496
    Abstract: According to an aspect of the present invention, a method for reconstructing an audio signal having a baseband portion and a highband portion is disclosed. The method includes obtaining a decoded baseband audio signal by decoding an encoded audio signal and obtaining a plurality of subband signals by filtering the decoded baseband audio signal. The method further includes generating a high-frequency reconstructed signal by copying a number of consecutive subband signals of the plurality of subband signals and obtaining an envelope adjusted high-frequency signal. The method further includes generating a noise component based on a noise parameter. Finally, the method includes adjusting a phase of the high-frequency reconstructed signal and obtaining a time-domain reconstructed audio signal by combining the decoded baseband audio signal and the combined high-frequency signal to obtain a time-domain reconstructed audio signal.
    Type: Grant
    Filed: February 6, 2017
    Date of Patent: July 11, 2017
    Assignee: Dolby Laboratories Licensing Corporation
    Inventors: Michael M. Truman, Mark S. Vinton
  • Patent number: 9706219
    Abstract: A method is provided for coding at least one image split up into partitions, a current partition to be coded containing data, at least one data item of which is allotted a sign. The coding method includes, for the current partition, the following steps: calculating the value of a function representative of the data of the current partition with the exclusion of the sign; comparing the calculated value with a predetermined value of the sign; as a function of the result of the comparison, modifying or not modifying at least one of the data items of the current partition, in the case of modification; coding the at least one modified data item.
    Type: Grant
    Filed: April 18, 2016
    Date of Patent: July 11, 2017
    Assignee: Dolby International AB
    Inventors: Felix Henry, Gordon Clare
  • Patent number: 9704499
    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: Grant
    Filed: March 1, 2017
    Date of Patent: July 11, 2017
    Assignee: Dolby Laboratories Licensing Corporation
    Inventor: Mark F. Davis
  • Patent number: 9705461
    Abstract: The invention relates to the measurement and control of the perceived sound loudness and/or the perceived spectral balance of an audio signal. An audio signal is modified in response to calculations performed at least in part in the perceptual (psychoacoustic) loudness domain. The invention is useful, for example, in one or more of: loudness-compensating volume control, automatic gain control, dynamic range control (including, for example, limiters, compressors, expanders, etc.), dynamic equalization, and compensating for background noise interference in an audio playback environment. The invention includes not only methods but also corresponding computer programs and apparatus.
    Type: Grant
    Filed: March 27, 2017
    Date of Patent: July 11, 2017
    Assignee: Dolby Laboratories Licensing Corporation
    Inventor: Alan Jeffrey Seefeldt
  • Patent number: 9706308
    Abstract: This invention relates to the field of multichannel audio. More particularly, the invention relates to a method for the provision of audio channels suitable for application to loudspeakers located above conventional front loudspeakers.
    Type: Grant
    Filed: March 3, 2015
    Date of Patent: July 11, 2017
    Assignee: Dolby Laboratories Licensing Corporation
    Inventor: Christophe Chabanne
  • Patent number: 9706217
    Abstract: Implementations are provided that relate, for example, to view tiling in video encoding and decoding. A particular method includes accessing a video picture that includes multiple pictures combined into a single picture (826), accessing information indicating how the multiple pictures in the accessed video picture are combined (806, 808, 822), decoding the video picture to provide a decoded representation of at least one of the multiple pictures (824, 826), and providing the accessed information and the decoded video picture as output (824, 826). Some other implementations format or process the information that indicates how multiple pictures included in a single video picture are combined into the single video picture, and format or process an encoded representation of the combined multiple pictures.
    Type: Grant
    Filed: August 23, 2016
    Date of Patent: July 11, 2017
    Assignee: Dolby Laboratories Licensing Corporation
    Inventors: Purvin Bibhas Pandit, Peng Yin, Dong Tian
  • Publication number: 20170194942
    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 phase shifter, 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 phase shifter shifts a phase of the complex-valued subband samples by an arbitrary amount. The high frequency reconstructor modifies at least some of the complex valued subband samples. A phase shifter unshifts a phase of the modified complex-valued subband samples by the arbitrary amount. 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: March 22, 2017
    Publication date: July 6, 2017
    Applicant: Dolby International AB
    Inventor: Per Ekstrand
  • Publication number: 20170195819
    Abstract: Method and apparatus is described relating to configuring playback of audio via a home audio playback system. The method relates to a graphical user interface, where the graphical user interface comprises a positioning area. Control objects representing audio objects are movable by the user to different locations in the position area, where the current location of the control object represents a user-desired playback position in a listening environment. A method also relates to configuring playback of audio with a graphical user interface comprising a balance adjustment area. In the balance adjustment area of the user interface the user can select a volume level for foreground and background objects.
    Type: Application
    Filed: May 20, 2015
    Publication date: July 6, 2017
    Applicant: DOLBY INTERNATIONAL AB
    Inventors: Sigrid HARDER, Robert Andrew FRANCE, Thomas ZIEGLER, Radoslaw MUSIAL, Christopher OATES
  • Patent number: 9697799
    Abstract: A handheld imaging device has a data receiver that is configured to receive reference encoded image data. The data includes reference code values, which are encoded by an external coding system. The reference code values represent reference gray levels, which are being selected using a reference grayscale display function that is based on perceptual non-linearity of human vision adapted at different light levels to spatial frequencies. The imaging device also has a data converter that is configured to access a code mapping between the reference code values and device-specific code values of the imaging device. The device-specific code values are configured to produce gray levels that are specific to the imaging device. Based on the code mapping, the data converter is configured to transcode the reference encoded image data into device-specific image data, which is encoded with the device-specific code values.
    Type: Grant
    Filed: September 30, 2016
    Date of Patent: July 4, 2017
    Assignee: Dolby Laboratories Licensing Corporation
    Inventors: Jon Scott Miller, Scott Daly, Mahdi Nezamabadi, Robin Atkins
  • Patent number: 9697840
    Abstract: The present document relates to methods and systems for music information retrieval (MIR). In particular, the present document relates to methods and systems for extracting a chroma vector from an audio signal. A method (900) for determining a chroma vector (100) for a block of samples of an audio signal (301) is described. The method (900) comprises receiving (901) a corresponding block of frequency coefficients derived from the block of samples of the audio signal (301) from a core encoder (412) of a spectral band replication based audio encoder (410) adapted to generate an encoded bitstream (305) of the audio signal (301) from the block of frequency coefficients; and determining (904) the chroma vector (100) for the block of samples of the audio signal (301) based on the received block of frequency coefficients.
    Type: Grant
    Filed: November 28, 2012
    Date of Patent: July 4, 2017
    Assignee: Dolby International AB
    Inventors: Arijit Biswas, Marco Fink, Michael Schug
  • Patent number: 9696558
    Abstract: Laser or narrow band light sources are utilized to from left (R1, G1, B1) and right (R2,G2;B2,) images of a 3D projection. Under off-axis viewing of projections (i.e. oblique incident angles) the passbands of the viewing filters in the glasses are blue-shifted, which has the potential of cause crosstalk and/or loss of energy/brightness in any channel or color. This blue-shift is compensated via the combined use of any of viewing passbands (220) encompassing the associated projected lightband (222) and a red-shift passband (224) selection of passband wavelengths that maximize usability of the passband as it “shifts” due to varying or increasing angles of off-axis viewing), curvature of viewing filters, and guard bands between light bands of adjacent channels. Implemented with any number of light sources, additional light sources are utilized to affect a desirable increase in color gamut.
    Type: Grant
    Filed: March 14, 2012
    Date of Patent: July 4, 2017
    Assignee: Dolby Laboratories Licensing Corporation
    Inventor: Martin J. Richards
  • Patent number: 9698744
    Abstract: In some embodiments, a method for processing an audio signal in an audio processing apparatus is disclosed. The method includes receiving an audio signal and a parameter, the parameter indicating a location of an auditory event boundary. An audio portion between consecutive auditory event boundaries constitutes an auditory event. The method further includes applying a modification to the audio signal based in part on an occurrence of the auditory event. The parameter may be generated by monitoring a characteristic of the audio signal and identifying a change in the characteristic.
    Type: Grant
    Filed: March 2, 2017
    Date of Patent: July 4, 2017
    Assignee: Dolby Laboratories Licensing Corporation
    Inventors: Brett G. Crockett, Alan J. Seefeldt
  • Patent number: 9698743
    Abstract: Methods, media and apparatus for smoothing a time-varying level of a signal. A method includes estimating a time-varying probability density of a short-term level of the signal and smoothing a level of the signal by using the probability density. The signal may be an audio signal. The short-term level and the smoothed level may be time series, each having current and previous time indices. Here, before the smoothing, computing a probability of the smoothed level at the previous time index may occur. Before the smoothing, calculating smoothing parameters using the probability density may occur. Calculating the smoothing parameters may include calculating the smoothing parameters using the smoothed level at the previous time index, the short-term level at the current time index and the probability of the smoothed level at the previous time index. Calculating the smoothing parameters may include calculating the smoothing parameters using breadth of the estimated probability density.
    Type: Grant
    Filed: July 11, 2008
    Date of Patent: July 4, 2017
    Assignee: Dolby Laboratories Licensing Corporation
    Inventor: Alan Jeffrey Seefeldt
  • Patent number: 9697842
    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: Grant
    Filed: March 1, 2017
    Date of Patent: July 4, 2017
    Assignee: Dolby Laboratories Licensing Corporation
    Inventor: Mark F. Davis
  • Patent number: 9699585
    Abstract: A multi-channel decoder for generating a binaural signal from a downmix signal using upmix rule information on an energy-error introducing upmix rule for calculating a gain factor based on the upmix rule information and characteristics of head related transfer function based filters corresponding to upmix channels. The one or more gain factors are used by a filter processor for filtering the downmix signal so that an energy corrected binaural signal having a left binaural channel and a right binaural channel is obtained.
    Type: Grant
    Filed: July 30, 2014
    Date of Patent: July 4, 2017
    Assignee: DOLBY INTERNATIONAL AB
    Inventor: Lars Villemoes
  • Patent number: 9699484
    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: Grant
    Filed: December 6, 2016
    Date of Patent: July 4, 2017
    Assignee: Dolby Laboratories Licensing Corporation
    Inventors: Guan-Ming Su, Robin Atkins, Qian Chen
  • Patent number: 9699454
    Abstract: Rate control techniques are provided for encoding an input video sequence into a compressed coded bitstream with multiple coding passes. The final coding pass may comprise final splices with non-overlapping frames that do not extend into neighboring final splices. A final splice in the final coding pass may correspond to at least one non-final splice in a non-final coding pass. A non-final splice may have overlapping frames that extend into neighboring final splices in the final coding pass. The overlapping frames in the non-final splice may be used to derive complexity information about the neighboring final splices. The complexity information about the neighboring final splices, as derived from the overlapping frames, may be used to allocate or improve rate control related budgets in encoding the final splice into the compressed coded bitstream in the final coding pass.
    Type: Grant
    Filed: November 11, 2015
    Date of Patent: July 4, 2017
    Assignee: Dolby Laboratories Licensing Corporation
    Inventors: Athanasios Leontaris, Alexandros Tourapis
  • Patent number: RE46482
    Abstract: Adjacent blocks are identified in an image. Coding parameters for the adjacent blocks are identified. Deblock filtering between the identified adjacent blocks is skipped if the coding parameters for the identified adjacent blocks are similar and not skipped if the coding parameters for the identified adjacent blocks are substantially different.
    Type: Grant
    Filed: October 10, 2014
    Date of Patent: July 18, 2017
    Assignee: Dolby Laboratories Licensing Corporation
    Inventors: Shijun Sun, Shawmin Lei
  • Patent number: RE46491
    Abstract: Adjacent blocks are identified in an image. Coding parameters for the adjacent blocks are identified. Deblock filtering between the identified adjacent blocks is skipped if the coding parameters for the identified adjacent blocks are similar and not skipped if the coding parameters for the identified adjacent blocks are substantially different.
    Type: Grant
    Filed: October 10, 2014
    Date of Patent: July 25, 2017
    Assignee: Dolby Laboratories Licensing Corporation
    Inventors: Shijun Sun, Shawmin Lei