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: 20180053515
    Abstract: Methods for generating an object based audio program, renderable in a personalizable manner, and including a bed of speaker channels renderable in the absence of selection of other program content (e.g., to provide a default full range audio experience). Other embodiments include steps of delivering, decoding, and/or rendering such a program. Rendering of content of the bed, or of a selected mix of other content of the program, may provide an immersive experience. The program may include multiple object channels (e.g., object channels indicative of user-selectable and user-configurable objects), the bed of speaker channels, and other speaker channels. Another aspect is an audio processing unit (e.g., encoder or decoder) configured to perform, or which includes a buffer memory which stores at least one frame (or other segment) of an object based audio program (or bitstream thereof) generated in accordance with, any embodiment of the method.
    Type: Application
    Filed: October 24, 2017
    Publication date: February 22, 2018
    Applicants: DOLBY LABORATORIES LICENSING CORPORATION, DOLBY INTERNATIONAL AB
    Inventors: Sripal S. MEHTA, Thomas ZIEGLER, Giles BAKER, Jeffrey RIEDMILLER, Prinyar SAUNGSOMBOON
  • Publication number: 20180054689
    Abstract: Embodiments of the present invention relate to video content assisted audio object extraction. A method of audio object extraction from channel-based audio content is disclosed. The method comprises extracting at least one video object from video content associated with the channel-based audio content, and determining information about the at least one video object. The method further comprises extracting from the channel-based audio content an audio object to be rendered as an upmixed audio signal based on the determined information. Corresponding system and computer program product are also disclosed.
    Type: Application
    Filed: February 24, 2016
    Publication date: February 22, 2018
    Applicant: Dolby Laboratories Licensing Corporation
    Inventors: Lianwu CHEN, Xuejing SUN, Lie LU
  • Publication number: 20180053517
    Abstract: The present invention proposes a new method for improving the performance of a real-valued filterbank based spectral envelope adjuster. By adaptively locking the gain values for adjacent channels dependent on the sign of the channels, as defined in the application, reduced aliasing is achieved. Furthermore, the grouping of the channels during gain-calculation, gives an improved energy estimate of the real valued subband signals in the filterbank.
    Type: Application
    Filed: October 31, 2017
    Publication date: February 22, 2018
    Applicant: DOLBY INTERNATIONAL AB
    Inventors: Kristofer KJOERLING, Lars VILLEMOES
  • Publication number: 20180054676
    Abstract: A multi-channel input signal having at least three original channels is represented by a parameter representation of the multi-channel signal. A first balance parameter, a first coherence parameter, or a first inter-channel time difference between a first channel pair and a second balance parameter, or a second coherence parameter, or a second inter-channel time difference parameter between a second channel pair are calculated. This set of parameters is the parameter representation of the original signals. The first channel pair has two channels, which are different from two channels of a second channel pair. Furthermore, each channel of the two channel pairs is one of the original channels, or a weighted combination of the original channels, and the first channel pair and the second channel pair include information on the three original channels.
    Type: Application
    Filed: April 19, 2013
    Publication date: February 22, 2018
    Applicant: Dolby International AB
    Inventors: Heiko PURNHAGEN, Lars VILLEMOES, Jonas ENGDEGARD, Jonas ROEDEN, Kristofer KJOERLING
  • Publication number: 20180054688
    Abstract: Some disclosed implementations include an interface system and a control system. The control system may be capable of receiving, via the interface system, microphone data. The control system may be capable of determining, based at least in part on the microphone data, instances of one or more acoustic events. The instances of one or more acoustic events may, in some examples, include conversational dynamics data. The control system may be capable of providing behavior modification feedback, via the interface system, corresponding with the instances of the one or more acoustic events.
    Type: Application
    Filed: August 15, 2017
    Publication date: February 22, 2018
    Applicant: Dolby Laboratories Licensing Corporation
    Inventors: Richard J. CARTWRIGHT, Peter MARTIN, Christopher Stanley MCGRATH, Glenn N. DICKINS
  • Publication number: 20180053516
    Abstract: The present invention proposes a new method for improving the performance of a real-valued filterbank based spectral envelope adjuster. By adaptively locking the gain values for adjacent channels dependent on the sign of the channels, as defined in the application, reduced aliasing is achieved. Furthermore, the grouping of the channels during gain-calculation, gives an improved energy estimate of the real valued subband signals in the filterbank.
    Type: Application
    Filed: October 31, 2017
    Publication date: February 22, 2018
    Applicant: DOLBY INTERNATIONAL AB
    Inventors: Kristofer KJOERLING, Lars VILLEMOES
  • Patent number: 9900720
    Abstract: Audio stems are generated to contain audio content to be mixed by recipient devices. Multiple sets of mixing instructions for multiple audio channel configurations are determined, for example, based on input of audio producers. Each set of mixing instructions is to be used for mixing the audio stems for rendering in a corresponding audio channel configuration. A bitstream is generated to carry both the audio stems and the sets of mixing instructions. A recipient device receives the bitstream as the input. The recipient device determines a specific audio channel configuration to be used for rendering the plurality of audio stems. Based on that determination, a specific set of mixing instructions is retrieved from the bitstream and used to mix the audio stems.
    Type: Grant
    Filed: March 25, 2014
    Date of Patent: February 20, 2018
    Assignees: Dolby Laboratories Licensing Corporation, Dolby International AB
    Inventors: Michael Grant, Timothy Addy, Michael Hoffmann, Sachin Nanda
  • Patent number: 9900721
    Abstract: There are two representations for Higher Order Ambisonics denoted HOA: spatial domain and coefficient domain. The invention generates from a coefficient domain representation a mixed spatial/coefficient domain representation, wherein the number of said HOA signals can be variable. A vector of coefficient domain signals is separated into a vector of coefficient domain signals having a constant number of HOA coefficients and a vector of coefficient domain signals having a variable number of HOA coefficients. The constant-number HOA coefficients vector is transformed to a corresponding spatial domain signal vector. In order to facilitate high-quality coding, without creating signal discontinuities the variable-number HOA coefficients vector of coefficient domain signals is adaptively normalized and multiplexed with the vector of spatial domain signals.
    Type: Grant
    Filed: May 5, 2017
    Date of Patent: February 20, 2018
    Assignee: Dolby Laboratories Licensing Corporation
    Inventors: Sven Kordon, Alexander Krueger
  • Patent number: 9899029
    Abstract: There are provided decoding and encoding methods for encoding and decoding of multichannel audio content for playback on a speaker configuration with N channels. The decoding method comprises decoding, in a first decoding module, M input audio signals into M mid signals which are suitable for playback on a speaker configuration with M channels; and for each of the N channels in excess of M channels, receiving an additional input audio signal corresponding to one of the M mid signals and decoding the input audio signal and its corresponding mid signal so as to generate a stereo signal including a first and a second audio signal which are suitable for playback on two of the N channels of the speaker configuration.
    Type: Grant
    Filed: April 18, 2017
    Date of Patent: February 20, 2018
    Assignee: Dolby International AB
    Inventors: Heiko Purnhagen, Harald Mundt, Kristofer Kjoerling
  • Publication number: 20180047405
    Abstract: In some embodiments, a pitch filter for filtering a preliminary audio signal generated from an audio bitstream is disclosed. The pitch filter has an operating mode selected from one of either: (i) an active mode where the preliminary audio signal is filtered using filtering information to obtain a filtered audio signal, and (ii) an inactive mode where the pitch filter is disabled. The preliminary audio signal is generated in an audio encoder or audio decoder having a coding mode selected from at least two distinct coding modes, and the pitch filter is capable of being selectively operated in either the active mode or the inactive mode while operating in the coding mode based on control information.
    Type: Application
    Filed: October 24, 2017
    Publication date: February 15, 2018
    Applicant: DOLBY INTERNATIONAL AB
    Inventors: Barbara RESCH, Kristofer KJÖRLING, Lars VILLEMOES
  • Publication number: 20180048904
    Abstract: Implementations are provided that relate, for example, to view tiling in video encoding and decoding. A particular method includes accessing a video picture that includes multiple pictures combined into a single picture (826), accessing information indicating how the multiple pictures in the accessed video picture are combined (806, 808, 822), decoding the video picture to provide a decoded representation of at least one of the multiple pictures (824, 826), and providing the accessed information and the decoded video picture as output (824, 826). Some other implementations format or process the information that indicates how multiple pictures included in a single video picture are combined into the single video picture, and format or process an encoded representation of the combined multiple pictures.
    Type: Application
    Filed: October 23, 2017
    Publication date: February 15, 2018
    Applicant: DOLBY LABORATORIES LICENSING CORPORATION
    Inventors: Purvin Bibhas PANDIT, Peng YIN, Dong TIAN
  • Publication number: 20180048768
    Abstract: In an audio conferencing environment, including multiple users participating by means of a series of associated audio input devices for the provision of audio input, and a series of audio output devices for the output of audio output streams to the multiple users, with the audio input and output devices being interconnected to a mixing control server for the control and mixing of the audio inputs from each audio input devices to present a series of audio streams to the audio output devices, a method of reducing the effects of cross talk pickup of at least a first audio conversation by multiple audio input devices, the method including the steps of: (a) monitoring the series of audio input devices for the presence of a duplicate audio conversation input from at least two input audio sources in an audio output stream; and (b) where a duplicate audio conversation input is detected, suppressing the presence of the duplicate audio conversation input in the audio output stream.
    Type: Application
    Filed: February 8, 2016
    Publication date: February 15, 2018
    Applicant: Dolby Laboratories Licensing Corporation
    Inventors: Gary SPITTLE, Glenn DICKINS, David GUNAWAN, Guilin MA
  • Publication number: 20180048974
    Abstract: There are two representations for Higher Order Ambisonics denoted HOA: spatial domain and coefficient domain. The invention generates from a coefficient domain representation a mixed spatial/coefficient domain representation, wherein the number of said HOA signals can be variable. A vector of coefficient domain signals is separated into a vector of coefficient domain signals having a constant number of HOA coefficients and a vector of coefficient domain signals having a variable number of HOA coefficients. The constant-number HOA coefficients vector is transformed to a corresponding spatial domain signal vector. In order to facilitate high-quality coding, without creating signal discontinuities the variable-number HOA coefficients vector of coefficient domain signals is adaptively normalised and multiplexed with the vector of spatial domain signals.
    Type: Application
    Filed: October 23, 2017
    Publication date: February 15, 2018
    Applicant: Dolby Laboratories Licensing Corporation
    Inventors: Sven Kordon, Alexander Krueger
  • Publication number: 20180047411
    Abstract: The present invention relates to coding of audio signals, and in particular to high frequency reconstruction methods including a frequency domain harmonic transposer. A system and method for generating a high frequency component of a signal from a low frequency component of the signal is described.
    Type: Application
    Filed: October 25, 2017
    Publication date: February 15, 2018
    Applicant: Dolby International AB
    Inventors: Lars Villemoes, Per Ekstrand
  • Publication number: 20180048683
    Abstract: Apparatus comprising an interface for receiving a respective uplink data stream from each of three or more further apparatuses, and for transmitting a respective downlink data stream to each of the further apparatuses; and a logic system in communication with the interface. The logic system is configured: to receive first data in the uplink data stream received from a first one of the further apparatuses; and in a first mode, to include at least some of the first data in the respective downlink data streams transmitted to every other one of the further apparatuses, or, in a second mode, to include at least some of the first data in the downlink data stream transmitted to a second one of the further apparatuses and to omit or attenuate substantially all of the first data in the downlink data stream transmitted to at least a third one of the further apparatuses. Corresponding methods and computer readable media are disclosed.
    Type: Application
    Filed: August 8, 2017
    Publication date: February 15, 2018
    Applicant: DOLBY LABORATORIES LICENSING CORPORATION
    Inventors: Rowan James KATEKAR, Glenn N. DICKINS
  • Patent number: 9892736
    Abstract: The invention provides methods and devices for stereo encoding and decoding using complex prediction in the frequency domain. In one embodiment, a decoding method, for obtaining an output stereo signal from an input stereo signal encoded by complex prediction coding and comprising first frequency-domain representations of two input channels, comprises the upmixing steps of: (i) computing a second frequency-domain representation of a first input channel; and (ii) computing an output channel on the basis of the first and second frequency-domain representations of the first input channel, the first frequency-domain representation of the second input channel and a complex prediction coefficient. The upmixing can be suspended responsive to control data.
    Type: Grant
    Filed: July 7, 2015
    Date of Patent: February 13, 2018
    Assignee: Dolby International AB
    Inventors: Heiko Purnhagen, Pontus Carlsson, Lars Villemoes
  • Patent number: 9892741
    Abstract: The present document relates to audio source coding systems. In particular, the present document relates to audio source coding systems which make use of linear prediction in combination with a filterbank. A method for estimating a first sample (615) of a first subband signal in a first subband of an audio signal is described. The first subband signal of the audio signal is determined using an analysis filterbank (612) comprising a plurality of analysis filters which provide a plurality of subband signals in a plurality of subbands from the audio signal, respectively.
    Type: Grant
    Filed: April 13, 2017
    Date of Patent: February 13, 2018
    Assignee: Dolby International AB
    Inventor: Lars Villemoes
  • Patent number: 9894314
    Abstract: Methods and apparatus for distributing video data provide video data containing two or more different versions of video content. The different versions may be optimized for display on different displays and/or for viewing under different ambient conditions. Video data optimized for display on a particular display under particular ambient conditions may be obtained by one or more of selecting one of the versions of video content and combining two or more of the versions of the video content.
    Type: Grant
    Filed: June 13, 2011
    Date of Patent: February 13, 2018
    Assignee: Dolby Laboratories Licensing Corporation
    Inventor: Robin Atkins
  • Patent number: 9892737
    Abstract: There is provided encoding and decoding methods for encoding and decoding of object based audio. An exemplary encoding method includes inter alia calculating M downmix signals by forming combinations of N audio objects, wherein M?N, and calculating parameters which allow reconstruction of a set of audio objects formed on basis of the N audio objects from the M downmix signals. The calculation of the M downmix signals is made according to a criterion which is independent of any loudspeaker configuration.
    Type: Grant
    Filed: May 23, 2014
    Date of Patent: February 13, 2018
    Assignee: Dolby International AB
    Inventors: Heiko Purnhagen, Kristofer Kjoerling, Toni Hirvonen, Lars Villemoes, Dirk Jeroen Breebaart, Leif Jonas Samuelsson
  • Publication number: 20180041759
    Abstract: A content-adaptive quantizer processor receives an input image with an input bit depth. A noise-mask generation process is applied to the input image to generate a noise mask image which characterizes each pixel in the input image in terms of its perceptual relevance in masking quantization noise. A noise mask histogram is generated based on the input image and the noise mask image. A masking-noise level to bit-depth function is applied to the noise mask histogram to generate minimal bit depth values for each bin in the noise mask histogram. A codeword mapping function is generated based on the input bit depth, a target bit depth, and the minimal bit depth values. The codeword mapping function is applied to the input image to generate an output image in the target bit depth.
    Type: Application
    Filed: March 1, 2016
    Publication date: February 8, 2018
    Applicants: DOLBY INTERNATIONAL AB, Dolby Laboratories Licensing Corporation
    Inventors: Jan FROEHLICH, Guan-Ming SU, Robin ATKINS, Scott DALY, Jon Scott MILLER
  • Publication number: 20180041639
    Abstract: Systems and methods are described for modifying one of far-end signal playback and capture of local audio on an audio device. Frames of both a far-end audio stream and a near-end audio stream may be analyzed using a measure of voice activity, the analyzing producing voice data associated with each frame. Based on the voice data, a conference state may be determined, and one of playback of the far-end audio stream and capture of local audio on an audio device may be modified based on the determined conference state. By associating the likely intent with a predefined state, the device may further cull or remove unwanted or unlikely content from the device input and output. This may have a substantial advantage in allowing for full duplex operation in the case of more meaningful and continuing voice activity, particularly in the case where there are many connected endpoints.
    Type: Application
    Filed: August 2, 2017
    Publication date: February 8, 2018
    Applicant: DOLBY LABORATORIES LICENSING CORPORATION
    Inventors: David GUNAWAN, Glenn N. DICKINS
  • Publication number: 20180039169
    Abstract: A locally dimmed display has a spatial light modulator illuminated by a light source. The spatial light modulator is illuminated with a low resolution version of a desired image. The illumination may comprise a series of lighting elements that vary smoothly from one element to another at the spatial light modulator.
    Type: Application
    Filed: October 17, 2017
    Publication date: February 8, 2018
    Applicant: Dolby Laboratories Licensing Corporation
    Inventors: Lorne A. Whitehead, Gregory John Ward, Wolfgang Stuerzlinger, Helge Seetzen
  • Publication number: 20180040336
    Abstract: A system and method of blind bandwidth extension. The system selects a prediction model from a number of stored prediction models that were generated using an unsupervised clustering method (e.g., a k-means method) and a supervised regression process (e.g., a support vector machine), and extends the bandwidth of an input musical audio signal.
    Type: Application
    Filed: August 2, 2017
    Publication date: February 8, 2018
    Applicant: Dolby Laboratories Licensing Corporation
    Inventors: Chih-Wei WU, Mark S. VINTON
  • Publication number: 20180033453
    Abstract: According to one aspect, a method for detecting voice activity is disclosed, the method including receiving a frame of an input audio signal, the input audio signal having an sample rate; dividing the frame into a plurality of subbands based on the sample rate, the plurality of subbands including at least a lowest subband and a highest subband; filtering the lowest subband with a moving average filter to reduce an energy of the lowest subband; estimating a noise level for each of the plurality of subbands; calculating a signal to noise ratio value for each of the plurality of subbands; and determining a speech activity level of the frame based on an average of the calculated signal to noise ratio values and a weighted average of an energy of each of the plurality of subbands. Other aspects include audio decoders that decode audio that was encoded using the methods described herein.
    Type: Application
    Filed: October 12, 2017
    Publication date: February 1, 2018
    Applicant: Dolby Laboratories Licensing Corporation
    Inventor: Hannes Muesch
  • Publication number: 20180031921
    Abstract: Techniques for driving a dual modulation display include generating backlight drive signals to drive individually-controllable illumination sources. The illumination sources emit first light onto a light conversion layer. The light conversion layer converts the first light, such as blue or ultraviolet light, into second light, such as white light. The light conversion layer can include quantum dot materials. Liquid crystal display (LCD) modulation drive signals are generated to determine transmission of the second light through individual color subpixels of the display. These LCD modulation drive signals can be adjusted based on one or more light field simulations to account for non-uniform, spatial color shifts. Alternatively, one or more light field simulations based on a uniformity assumption determine intermediate LCD modulation drive signals. A compensation field simulation, using backlight drive signals, is then used to adjust the intermediate LCD modulation drive signal for color correction.
    Type: Application
    Filed: October 5, 2017
    Publication date: February 1, 2018
    Applicant: Dolby Laboratories Licensing Corporation
    Inventors: Chun Chi WAN, Ajit NINAN
  • Publication number: 20180033446
    Abstract: The present invention relates to audio coding systems which make use of a harmonic transposition method for high frequency reconstruction (HFR). A system and a method for generating a high frequency component of a signal from a low frequency component of the signal is described. The system comprises an analysis filter bank providing a plurality of analysis subband signals of the low frequency component of the signal. It also comprises a non-linear processing unit to generate a synthesis subband signal with a synthesis frequency by modifying the phase of a first and a second of the plurality of analysis subband signals and by combining the phase-modified analysis subband signals. Finally, it comprises a synthesis filter bank for generating the high frequency component of the signal from the synthesis subband signal.
    Type: Application
    Filed: September 20, 2017
    Publication date: February 1, 2018
    Applicant: Dolby International AB
    Inventors: Lars Villemoes, Per Hedelin
  • Publication number: 20180035233
    Abstract: The present disclosure relates to reverberation generation for headphone virtualization. A method of generating one or more components of a binaural room impulse response (BRIR) for headphone virtualization is described. In the method, directionally-controlled reflections are generated, wherein directionally-controlled reflections impart a desired perceptual cue to an audio input signal corresponding to a sound source location. Then at least the generated reflections are combined to obtain the one or more components of the BRIR. Corresponding system and computer program products are described as well.
    Type: Application
    Filed: February 11, 2016
    Publication date: February 1, 2018
    Applicant: Dolby Laboratories Licensing Corporation
    Inventors: Louis D. FIELDER, Zhiwei SHUANG, Grant A. DAVIDSON, Xiguang ZHENG, Mark S. VINTON
  • Patent number: 9883311
    Abstract: An audio playback system generates output signals for multiple channels of acoustic transducers by applying a rendering matrix to data representing the aural content and spatial characteristics of audio objects, so that the resulting sound field creates accurate listener impressions of the spatial characteristics. Matrix coefficients are updated to render moving objects. Discontinuous updates of the rendering matrix coefficients are controlled according to psychoacoustic principles to reduce audible artifacts. The updates may also be managed to control the amount of data needed to perform the updates.
    Type: Grant
    Filed: June 23, 2014
    Date of Patent: January 30, 2018
    Assignee: Dolby Laboratories Licensing Corporation
    Inventors: Dirk Jeroen Breebaart, David S. McGrath, Rhonda Wilson
  • Patent number: 9881635
    Abstract: A method and system for filtering a multi-channel audio signal having a speech channel and at least one non-speech channel, to improve intelligibility of speech determined by the signal. In typical embodiments, the method includes steps of determining at least one attenuation control value indicative of a measure of similarity between speech-related content determined by the speech channel and speech-related content determined by the non-speech channel, and attenuating the non-speech channel in response to the at least one attenuation control value. Typically, the attenuating step includes scaling of a raw attenuation control signal (e.g., a ducking gain control signal) for the non-speech channel in response to the at least one attenuation control value. Some embodiments are a general or special purpose processor programmed with software or firmware and/or otherwise configured to perform filtering in accordance the invention.
    Type: Grant
    Filed: November 16, 2015
    Date of Patent: January 30, 2018
    Assignee: Dolby Laboratories Licensing Corporation
    Inventor: Hannes Muesch
  • Patent number: 9883213
    Abstract: Methods for generating a transport stream (e.g., an MPEG-2 transport stream) such that the transport stream has at least one perfect splicing property, and/or such that the transport stream is indicative of at least one audio/video program and includes metadata indicative of whether the program has a perfect splicing property. Other aspects are methods for splicing such a transport stream, audio/video processing units (e.g., splicers) configured to perform any embodiment of the inventive method, and audio/video processing units which include a buffer memory which stores at least one segment of transport stream generated in accordance with any embodiment of the inventive method.
    Type: Grant
    Filed: February 10, 2015
    Date of Patent: January 30, 2018
    Assignee: Dolby International AB
    Inventors: Marc Roessler, Malte Schmidt
  • Patent number: 9881622
    Abstract: Methods and audio processing units for generating an object based audio program including conditional rendering metadata corresponding to at least one object channel of the program, where the conditional rendering metadata is indicative of at least one rendering constraint, based on playback speaker array configuration, which applies to each corresponding object channel, and methods for rendering audio content determined by such a program, including by rendering content of at least one audio channel of the program in a manner compliant with each applicable rendering constraint in response to at least some of the conditional rendering metadata. Rendering of a selected mix of content of the program may provide an immersive experience.
    Type: Grant
    Filed: April 3, 2014
    Date of Patent: January 30, 2018
    Assignees: Dolby Laboratories Licensing Corporation, Dolby International AB
    Inventors: Sripal S. Mehta, Thomas Ziegler, Stewart Murrie
  • Patent number: 9881629
    Abstract: On the basis of a bitstream (P), an n-channel audio signal (X) is reconstructed by deriving an m-channel core signal (Y) and multichannel coding parameters (?) from the bitstream, where 1?m<n. Also derived from the bitstream are pre-processing dynamic range control, DRC, parameters (DRC2) quantifying an encoder-side dynamic range limiting of the core signal. The n-channel audio signal is obtained by parametric synthesis in accordance with the multichannel coding parameters and while cancelling any encoder-side dynamic range limiting based on the pre-processing DRC parameters. In particular embodiments, the reconstruction further includes use of compensated post-processing DRC parameters quantifying a potential decoder-side dynamic range compression. Cancellation of an encoder-side range limitation and range compression are preferably performed by different decoder-side components. Cancellation and compression may be coordinated by a DRC pre-processor.
    Type: Grant
    Filed: July 13, 2017
    Date of Patent: January 30, 2018
    Assignees: Dolby Laboratories Licensing Corporation, Dolby International AB
    Inventors: Jeffrey Riedmiller, Karl J. Roeden, Kristofer Kjoerling, Heiko Purnhagen, Vinay Melkote, Leif Sehlstrom
  • Patent number: 9883314
    Abstract: A method for altering an audio signal of interest in a multi-channel soundfield representation of an audio environment, the method including the steps of: (a) extracting the signal of interest from the soundfield representation; (b) determining a residual soundfield signal; (c) inputting a further associated audio signal, which is associated with the signal of interest; (d) transforming the associated audio signal into a corresponding associated soundfield signal compatable with the residual soundfield; and (e) combining the residual soundfield signal with the associated soundfield signal to produce an output soundfield signal.
    Type: Grant
    Filed: July 1, 2015
    Date of Patent: January 30, 2018
    Assignee: Dolby Laboratories Licensing Corporation
    Inventors: David Gunawan, Glenn N. Dickins, Richard J. Cartwright
  • Patent number: 9883136
    Abstract: A method of storing and outputting associated audio. The associated audio and the main audio are stored in, and output from, a single multimedia container. In this manner, when the main language is changed, the associated audio automatically changes with minimal audio artifacts.
    Type: Grant
    Filed: April 8, 2014
    Date of Patent: January 30, 2018
    Assignee: Dolby Laboratories Licensing Corporation
    Inventors: Hugues A. De Saint Salvy, Gregory John McGarry
  • Patent number: 9881597
    Abstract: The present document relates to audio coding systems which make use of a harmonic transposition method for high frequency reconstruction (HFR), and to digital effect processors, e.g. so-called exciters, where generation of harmonic distortion adds brightness to the processed signal. In particular, a system configured to generate a high frequency component of a signal from a low frequency component of the signal is described. The system may comprise an analysis filter bank (501) configured to provide a set of analysis subband signals from the low frequency component of the signal; wherein the set of analysis subband signals comprises at least two analysis subband signals; wherein the analysis filter bank (501) has a frequency resolution of ?f.
    Type: Grant
    Filed: October 14, 2015
    Date of Patent: January 30, 2018
    Assignee: Dolby International AB
    Inventors: Per Ekstrand, Lars Villemoes, Per Hedelin
  • Patent number: 9883309
    Abstract: A method for inserting a first audio signal into a bitstream which comprises a downmix signal and associated bitstream metadata is described. The downmix signal and associated bitstream metadata are indicative of an audio program comprising a plurality of spatially diverse audio signals. The downmix signal comprises at least one audio channel and the bitstream metadata comprise upmix metadata for reproducing the plurality of spatially diverse audio signals from the at least one channel. The method comprises mixing the first audio signal with the at least one audio channel to generate a modified downmix signal. The method further comprises generating an output bitstream comprising the modified downmix signal and the associated modified bitstream metadata indicative of a modified audio program comprising a plurality of modified spatially diverse audio signals.
    Type: Grant
    Filed: September 23, 2015
    Date of Patent: January 30, 2018
    Assignees: Dolby Laboratories Licensing Corporation, Dolby International AB
    Inventors: Leif J. Samuelsson, Phillip Williams, Christian Schindler, Wolfgang A. Schildbach
  • Patent number: 9881621
    Abstract: The present document relates to audio signal processing in general, and to the concealment of artifacts that results from loss of audio packets during audio transmission over a packet-switched network, in particular. A method (200) for concealing one or more consecutive lost packets (412, 413) is described. A lost packet (412) is a packet which is deemed to be lost by a transform-based audio decoder. Each of the one or more lost packets (412, 413) comprises a set of transform coefficients (313). A set of transform coefficients (313) is used by the transform-based audio decoder to generate a corresponding frame (412, 413) of a time domain audio signal. The method (200) comprises determining (205) for a current lost packet (412) of the one or more lost packets (412, 413) a number of preceding lost packets from the one or more lost packets (313); wherein the determined number is referred to as a loss position.
    Type: Grant
    Filed: December 5, 2016
    Date of Patent: January 30, 2018
    Assignee: Dolby Laboratories Licensing Corporation
    Inventors: Shen Huang, Xuejing Sun
  • Publication number: 20180025738
    Abstract: Embodiments relate to an audio processing unit that includes a buffer, bitstream payload deformatter, and a decoding subsystem. The buffer stores at least one block of an encoded audio bitstream. The block includes a fill element that begins with an identifier followed by fill data. The fill data includes at least one flag identifying whether enhanced spectral band replication (eSBR) processing is to be performed on audio content of the block. A corresponding method for decoding an encoded audio bitstream is also provided.
    Type: Application
    Filed: March 10, 2016
    Publication date: January 25, 2018
    Applicant: DOLBY INTERNATIONAL AB
    Inventors: Lars VILLEMOES, Heiko PURNHAGEN, Per EKSTRAND
  • Publication number: 20180027352
    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: August 9, 2017
    Publication date: January 25, 2018
    Applicant: Dolby Laboratories Licensing Corporation
    Inventors: Charles Q. ROBINSON, Nicolas R. TSINGOS, Christophe CHABANNE
  • Publication number: 20180027123
    Abstract: Various disclosed implementations involve processing and/or playback of a recording of a conference involving a plurality of conference participants. Some implementations disclosed herein involve receiving audio data corresponding to a recording of at least one conference involving a plurality of conference participants. The audio data may include conference participant speech data from multiple endpoints, recorded separately and/or conference participant speech data from a single endpoint corresponding to multiple conference participants and including spatial information for each conference participant of the multiple conference participants. A search of the audio data may be based on one or more search parameters. The search may be a concurrent search for multiple features of the audio data. Instances of conference participant speech may be rendered to at least two different virtual conference participant positions of a virtual acoustic space.
    Type: Application
    Filed: February 3, 2016
    Publication date: January 25, 2018
    Applicant: DOLBY LABORATORIES LICENSING CORPORATION
    Inventors: Richard J. CARTWRIGHT, Shen HUANG
  • Publication number: 20180025739
    Abstract: The present document relates to time-alignment of encoded data of an audio encoder with associated metadata, such as spectral band replication (SBR) metadata. An audio decoder configured to determine a reconstructed frame of an audio signal from an access unit of a received data stream is described. The access unit comprises waveform data and metadata, wherein the waveform data and the metadata are associated with the same reconstructed frame of the audio signal. The audio decoder comprises a waveform processing path configured to generate a plurality of waveform subband signals from the waveform data, and a metadata processing path configured to generate decoded metadata from the metadata.
    Type: Application
    Filed: September 29, 2017
    Publication date: January 25, 2018
    Applicant: DOLBY INTERNATIONAL AB
    Inventors: Kristofer KJOERLING, Heiko PURNHAGEN, Jenns POPP
  • Publication number: 20180027245
    Abstract: Techniques for selecting a coding mode for an image coding process are described. Coding modes can be selected through a coding mode transition state machine, a re-quantization process, selection of an optimal transform size, by skipping some quantization parameters, or by performing motion search.
    Type: Application
    Filed: August 7, 2017
    Publication date: January 25, 2018
    Applicant: Dolby Laboratories Licensing Corporation
    Inventors: Alexandros TOURAPIS, Yan YE
  • Publication number: 20180027351
    Abstract: Various disclosed implementations involve processing and/or playback of a recording of a conference involving a plurality of conference participants. Some implementations involve receiving or determining conversational dynamics data. One or more variables of a cost function may be based, at least in part, on the conversational dynamics data. The cost function may be a spatial optimization cost function of a vector describing a virtual conference participant position for each of the conference participants in a virtual acoustic space. The virtual acoustic space may be determined relative to a listener's head. The virtual conference participant positions may be assigned according to a solution of the cost function.
    Type: Application
    Filed: February 3, 2016
    Publication date: January 25, 2018
    Applicant: DOLBY LABORATORIES LICENSING CORPORATION
    Inventors: Richard J. CARTWRIGHT, Hannes MUESCH
  • Publication number: 20180024429
    Abstract: Prism assemblies for projector display systems disclosed receive inputs from discrete color channels (e.g., red, green and blue channels. In one embodiment, “off state” light from the red, green, and blue DLP modulation may be reflected away from on-state light paths within the prism, tending to avoid uncontrolled scatter. In other embodiments, by keeping the colors separate for much of the prism path length, power levels may be significantly reduced at typical failure points. Light efficiency may be increased significantly when using discrete light sources like LEDs and lasers by removal of the additional red, green, and blue separation and re-combination losses.
    Type: Application
    Filed: December 21, 2015
    Publication date: January 25, 2018
    Applicant: DOLBY LABORATORIES LICENSING CORPORATION
    Inventors: Duane Scott DEWALD, Nathan WAINWRIGHT, Douglas J. GORNY, Martin J. RICHARDS
  • Publication number: 20180025464
    Abstract: An existing metadata set that is specific to a color volume transformation model is transformed to a metadata set that is specific to a distinctly different color volume transformation model. For example, source content metadata for a first color volume transformation model is received. This source metadata determines a specific color volume transformation, such as a sigmoidal tone map curve. The specific color volume transformation is mapped to a color volume transformation of a second color volume transformation model, e.g., a Bézier tone map curve. Mapping can be a best fit curve, or a reasonable approximation. Mapping results in metadata values used for the second color volume transformation model (e.g., one or more Bézier curve knee points and anchors). Thus, devices configured for the second color volume transformation model can reasonably render source content according to received source content metadata of the first color volume transformation model.
    Type: Application
    Filed: May 2, 2017
    Publication date: January 25, 2018
    Applicant: Dolby Laboratories Licensing Corporation
    Inventors: Raymond YEUNG, Patrick GRIFFIS, Thaddeus BEIER, Robin ATKINS
  • Publication number: 20180025737
    Abstract: Embodiments relate to an audio processing unit that includes a buffer, bitstream payload deformatter, and a decoding subsystem. The buffer stores at least one block of an encoded audio bitstream. The block includes a fill element that begins with an identifier followed by fill data. The fill data includes at least one flag identifying whether enhanced spectral band replication (eSBR) processing is to be performed on audio content of the block. A corresponding method for decoding an encoded audio bitstream is also provided.
    Type: Application
    Filed: March 10, 2016
    Publication date: January 25, 2018
    Applicant: DOLBY INTERNATIONAL AB
    Inventors: Lars VILLEMOES, Heiko PURNHAGEN, Per EKSTRAND
  • Patent number: 9877108
    Abstract: Example embodiments disclosed herein relate to user experience oriented audio signal processing. There is provided a method for user experience oriented audio signal processing. The method includes obtaining a first audio signal from an audio sensor of an electronic device; computing, based on the first audio signal, a compensation factor for an acoustic path from the electronic device to a listener and applying the compensation factor to a second audio signal outputted from the electronic device. Corresponding system and computer program products are disclosed.
    Type: Grant
    Filed: October 13, 2015
    Date of Patent: January 23, 2018
    Assignee: Dolby Laboratories Licensing Corporation
    Inventors: Guilin Ma, Xiguang Zheng, Chen Zhang, Xuejing Sun
  • Patent number: 9877032
    Abstract: A sequence of visual dynamic range (VDR) images is encoded using a standard dynamic range (SDR) base layer and one or more enhancement layers. A predicted VDR image is generated from an SDR input by using a weighted, multi-band, cross-color channel prediction model. Exponential weights with an adaptable decay parameter for each band are also presented.
    Type: Grant
    Filed: October 13, 2016
    Date of Patent: January 23, 2018
    Assignee: Dolby Laboratories Licensing Corporation
    Inventors: Guan-Ming Su, Sheng Qu, Peng Yin
  • Patent number: 9877047
    Abstract: Sampled data is packaged in checkerboard format for encoding and decoding. The sampled data may be quincunx sampled multi-image video data (e.g., 3D video or a multi-program stream), and the data may also be divided into sub-images of each image which are then multiplexed, or interleaved, in frames of a video stream to be encoded and then decoded using a standardized video encoder. A system for viewing may utilize a standard video decoder and a formatting device that de-interleaves the decoded sub-images of each frame reformats the images for a display device. A 3D video may be encoded using a most advantageous interleaving format such that a preferred quality and compression ratio is reached. In one embodiment, the invention includes a display device that accepts data in multiple formats.
    Type: Grant
    Filed: April 23, 2015
    Date of Patent: January 23, 2018
    Assignee: Dolby Laboratories Licensing Corporation
    Inventors: Alexandros Tourapis, Walter J. Husak, Peshala V. Pahalawatta, Athanasios Leontaris
  • Patent number: RE46684
    Abstract: Estimates of spectral magnitude and phase are obtained by an estimation process using spectral information from analysis filter banks such as the Modified Discrete Cosine Transform. The estimation process may be implemented by convolution-like operations with impulse responses. Portions of the impulse responses may be selected for use in the convolution-like operations to trade off between computational complexity and estimation accuracy. Mathematical derivations of analytical expressions for filter structures and impulse responses are disclosed.
    Type: Grant
    Filed: November 13, 2012
    Date of Patent: January 23, 2018
    Assignee: Dolby Laboratories Licensing Corporation
    Inventors: Corey I. Cheng, Michael J. Smithers, David N. Lathrop