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: 20170110136
    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: December 28, 2016
    Publication date: April 20, 2017
    Applicant: Dolby International AB
    Inventors: Kristofer KJOERLING, Lars VILLEMOES
  • Patent number: 9626149
    Abstract: In an audio encoder, for audio content received in a source audio format, default gains are generated based on a default dynamic range compression (DRC) curve, and non-default gains are generated for a non-default gain profile. Based on the default gains and non-default gains, differential gains are generated. An audio signal comprising the audio content, the default DRC curve, and differential gains is generated. In an audio decoder, the default DRC curve and the differential gains are identified from the audio signal. Default gains are re-generated based on the default DRC curve. Based on the combination of the re-generated default gains and the differential gains, operations are performed on the audio content extracted from the audio signal.
    Type: Grant
    Filed: April 14, 2016
    Date of Patent: April 18, 2017
    Assignees: Dolby Laboratories Licensing Corporation, Dobly International AB
    Inventors: Jeroen Koppens, Jeffrey Riedmiller, Kristofer Kjoerling, Alexander Groeschel, Holger Hoerich, Alan J. Seefeldt
  • Patent number: 9626921
    Abstract: A projection display system includes a spatial modulator that is controlled to compensate for flare in a lens of the projector. The spatial modulator increases achievable intra-frame contrast and facilitates increased peak luminance without unacceptable black levels. Some embodiments provide 3D projection systems in which the spatial modulator is combined with a polarization control panel.
    Type: Grant
    Filed: November 24, 2015
    Date of Patent: April 18, 2017
    Assignee: Dolby Laboratories Licensing Corporation
    Inventors: Gregory John Ward, Robin Atkins
  • Patent number: 9628802
    Abstract: In a video processing system, a method and system for generating a transform size syntax element for video decoding are provided. For high profile mode video decoding operations, the transform sizes may be selected based on the prediction macroblock type and the contents of the macroblock. A set of rules may be utilized to select from a 4.×.4 or an 8.×.8 transform size during the encoding operation. Dynamic selection of transform size may be performed on intra-predicted macroblocks, inter-predicted macroblocks, and/or direct mode inter-predicted macroblocks. The encoding operation may generate a transform size syntax element to indicate the transform size that may be used in reconstructing the encoded macroblock. The transform size syntax element may be transmitted to a decoder as part of the encoded video information bit stream.
    Type: Grant
    Filed: July 29, 2016
    Date of Patent: April 18, 2017
    Assignee: Dolby Laboratories Licensing Corporation
    Inventors: Stephen Gordon, Douglas Chin
  • Patent number: 9628801
    Abstract: In a video processing system, a method and system for generating a transform size syntax element for video decoding are provided. For high profile mode video decoding operations, the transform sizes may be selected based on the prediction macroblock type and the contents of the macroblock. A set of rules may be utilized to select from a 4.×.4 or an 8.×.8 transform size during the encoding operation. Dynamic selection of transform size may be performed on intra-predicted macroblocks, inter-predicted macroblocks, and/or direct mode inter-predicted macroblocks. The encoding operation may generate a transform size syntax element to indicate the transform size that may be used in reconstructing the encoded macroblock. The transform size syntax element may be transmitted to a decoder as part of the encoded video information bit stream.
    Type: Grant
    Filed: September 15, 2015
    Date of Patent: April 18, 2017
    Assignee: Dolby Laboratories Licensing Corporation
    Inventors: Stephen Gordon, Douglas Chin
  • Patent number: 9628818
    Abstract: A method of coding at least one image comprising the steps of splitting the image into a plurality of blocks, of grouping said blocks into a predetermined number of subsets of blocks, of coding each of said subsets of blocks in parallel, the blocks of a subset considered being coded according to a predetermined sequential order of traversal. The coding step comprises, for a current block of a subset considered, the sub-step of predictive coding of said current block with respect to at least one previously coded and decoded block, and the sub-step of entropy coding of said current block on the basis of at least one probability of appearance of a symbol.
    Type: Grant
    Filed: January 21, 2016
    Date of Patent: April 18, 2017
    Assignee: Dolby International AB
    Inventors: Felix Henry, Stephane Pateux
  • Patent number: 9628808
    Abstract: Input VDR images are received. A candidate set of function parameter values for a mapping function is selected from multiple candidate sets. A set of image blocks of non-zero standard deviations in VDR code words in at least one input VDR image is constructed. Mapped code values are generated by applying the mapping function with the candidate set of function parameter values to VDR code words in the set of image blocks in the at least one input VDR image. Based on the mapped code values, a subset of image blocks of standard deviations below a threshold value in mapped code words is determined as a subset of the set of image blocks. Based at least in part on the subset of image blocks, it is determined whether the candidate set of function parameter values is optimal for the mapping function to map the at least one input VDR image.
    Type: Grant
    Filed: March 25, 2014
    Date of Patent: April 18, 2017
    Assignee: Dolby Laboratories Licensing Corporation
    Inventors: Guan-Ming Su, Qian Chen, Hubert Koepfer
  • Patent number: 9628630
    Abstract: The present document relates to audio conference systems. In particular, the present document relates to improving the perceptual continuity within an audio conference system. According to an aspect, a method for multiplexing first and second continuous input audio signals is described, to yield a multiplexed output audio signal which is to be rendered to a listener. The first and second input audio signals (123) are indicative of sounds captured by a first and a second endpoint (120, 170), respectively. The method comprises determining a talk activity (201, 202) in the first and second input audio signals (123), respectively; and determining the multiplexed output audio signal based on the first and/or second input audio signals (123) and subject to one or more multiplexing conditions.
    Type: Grant
    Filed: September 25, 2013
    Date of Patent: April 18, 2017
    Assignee: Dolby Laboratories Licensing Corporation
    Inventors: Richard J. Cartwright, Glenn N. Dickins
  • Patent number: 9628826
    Abstract: A method for encoding an image having been cut up into partitions. The method includes: predicting data of a current partition based on an already encoded and then decoded reference partition, generating a predicted partition; determining residual data by comparing data relating to the current partition with the predicted partition, the residual data associated with various digital data items. Prior producing a signal containing the encoded information, performing the following steps: determining, from the predetermined residual data, a subset containing residual data capable of being modified; calculating the value of a function representative of the residual data; comparing the calculated value with a value of at least one of the digital data items; based on the comparison, modification or non-modification of at least one of the residual data items of the subset; and, in the event of a modification, entropy encoding the at least one modified residual data item.
    Type: Grant
    Filed: January 22, 2016
    Date of Patent: April 18, 2017
    Assignee: Dolby International AB
    Inventors: Felix Henry, Gordon Clare
  • Patent number: 9628887
    Abstract: A telecommunications device (1) comprises a base part (2), a cap part (4), a body part (3), a control panel (5), an upper light ring (9), a lower light ring (8), a plurality of sound microphones and a plurality of sound speakers. The cap part (4) is concave in shape. The body part (3) is frusto-conical in shape and tapers outwardly away from the cap part (4) towards the base part (2). The body part (3) and the cap part (4) cover the sound microphones and the sound speakers. The control panel (5) is inclined relative to the plane of the support surface (6) and relative to the plane of the base part (2). The control panel (5) protrudes upwardly from the upper edge of the body part (3) over the concave cap part (4), and the control panel (5) protrudes downwardly from the lower edge of the body part (3). The control panel (5) controls operation of the sound microphones and the sound speakers. The upper light ring (9) is located between the cap part (4) and the body part (3).
    Type: Grant
    Filed: October 3, 2013
    Date of Patent: April 18, 2017
    Assignee: Dolby Laboratories Licensing Corporation
    Inventors: Thao D. Hovanky, David Clementson, Venugopal Kalluri, Erwin Goesnar, Gary Spittle
  • Patent number: 9628933
    Abstract: Multi-channel audio content is mixed for a particular loudspeaker setup. However, a consumer's audio setup is very likely to use a different placement of speakers. The present invention provides a method of rendering multi-channel audio that assures replay of the spatial signal components with equal loudness of the signal. A method for obtaining an energy preserving mixing matrix (G) for mixing L1 input audio channels to L2 output channels comprises steps of obtaining (s711) a first mixing matrix G, performing (s712) a singular value decomposition on the first mixing matrix ? to obtain a singularity matrix S, processing (s713) the singularity matrix S to obtain a processed singularity matrix ?, determining (s715) a scaling factor a, and calculating (s716) an improved mixing matrix G according to G=a U ? VT. The perceived sound, loudness, timbre and spatial impression of multi-channel audio replayed on an arbitrary loudspeaker setup practically equals that of the original speaker setup.
    Type: Grant
    Filed: July 18, 2014
    Date of Patent: April 18, 2017
    Assignee: Dolby Laboratories Licensing Corporation
    Inventor: Johannes Boehm
  • Patent number: 9628934
    Abstract: M audio input channels, each associated with a spatial direction, are translated to N audio output channels, each associated with a spatial direction, wherein M and N are positive whole integers, M is three or more, and N is three or more, by deriving the N audio output channels from the M audio input channels, wherein one or more of the M audio input channels is associated with a spatial direction other than a spatial direction with which any of the N audio output channels is associated, and at least one of the one or more of the M audio input channels is mapped to a respective set of at least three of the N output channels. At least three output channels of a set may be associated with contiguous spatial directions.
    Type: Grant
    Filed: December 16, 2009
    Date of Patent: April 18, 2017
    Assignee: Dolby Laboratories Licensing Corporation
    Inventor: Mark F. Davis
  • Patent number: 9626970
    Abstract: Embodiments of the present invention relate to speaker identification using spatial information. A method of speaker identification for audio content being of a format based on multiple channels is disclosed. The method comprises extracting, from a first audio clip in the format, a plurality of spatial acoustic features across the multiple channels and location information, the first audio clip containing voices from a speaker, and constructing a first model for the speaker based on the spatial acoustic features and the location information, the first model indicating a characteristic of the voices from the speaker. The method further comprises identifying whether the audio content contains voices from the speaker based on the first model. Corresponding system and computer program product are also disclosed.
    Type: Grant
    Filed: December 16, 2015
    Date of Patent: April 18, 2017
    Assignee: Dolby Laboratories Licensing Corporation
    Inventors: Shen Huang, Xuejing Sun
  • Publication number: 20170103771
    Abstract: Example embodiments disclosed herein relate to noise level estimation. A method for noise level estimation is disclosed. The method includes, responsive to an increase of a signal level of a noise signal, calculating an impulsive noise probability of the noise signal, the impulsive noise probability indicating a likelihood that the noise signal is an impulsive noise. The method also includes determining a variable smoothing factor for noise level estimation based on the impulsive noise probability, the variable smoothing factor being associated with a previous estimated level of the noise signal. The method further includes smoothing the noise signal with the variable smoothing factor so as to determine a current estimated level of the noise signal. Corresponding system and computer program products are also disclosed.
    Type: Application
    Filed: June 8, 2015
    Publication date: April 13, 2017
    Applicant: DOLBY LABORATORIES LICENSING CORPORATION
    Inventors: Guilin MA, C. Phillip BROWN
  • Publication number: 20170104867
    Abstract: A voice quality estimation process may be triggered by receiving one or more alarms corresponding to one or more endpoint terminals being used during a teleconference. The alarm(s) may include uplink transmission alarms, downlink transmission alarms and/or acoustic quality alarms. The alarms may be based on evaluating transmission metrics and/or acoustic quality metrics. The voice quality estimation process may require a relatively greater computational burden than the processes of evaluating the transmission metrics and/or acoustic quality metrics for the purpose of potentially triggering an alarm. The accuracy and computational complexity of voice quality estimation may be adjusted by selecting times during which alarm detection will take place, alarm detector thresholds, alarm analyzer thresholds and/or levels of voice quality estimation.
    Type: Application
    Filed: June 15, 2015
    Publication date: April 13, 2017
    Applicant: DOLBY LABORATORIES LICENSING CORPORATION
    Inventors: Doh-Suk KIM, Jean-Francois CATZ
  • Publication number: 20170104552
    Abstract: A method of determining a near optimal forward error correction scheme for the transmission of audio data over a lossy packet switched network having preallocated estimated bandwidth, delay and packet losses, between at least a first and second communications devices, the method including the steps of: determining a first coding rate for the audio data; determining a peak redundancy coding rate for redundant versions of the audio data; determining an average redundancy coding rate over a period of time for redundant versions of the audio data; determining an objective function which maximizes a bitrate-perceptual audio quality mapping of the transmitted audio data including a playout function formulation; and optimising the objective function to produce a forward error correction scheme providing a high bitrate perceptual audio quality.
    Type: Application
    Filed: October 7, 2016
    Publication date: April 13, 2017
    Applicant: Dolby Laboratories Licensing Corporation
    Inventors: Xuejing Sun, Dong Shi
  • Publication number: 20170103761
    Abstract: A method of encoding audio information for forward error correction reconstruction of a transmitted audio stream over a lossy packet switched network, the method including the steps of: (a) dividing the audio stream into audio frames; (b) determining a series of corresponding audio frequency bands for the audio frames; (c) determining a series of power envelopes for the frequency bands; (d) encoding the envelopes as a low bit rate version of the audio frame in a redundant transmission frame.
    Type: Application
    Filed: October 7, 2016
    Publication date: April 13, 2017
    Applicant: Dolby Laboratories Licensing Corporation
    Inventors: Xuejing Sun, Kai Li, Mark S. Vinton, Shen Huang
  • Patent number: 9622010
    Abstract: Embodiments are directed to an interconnect for coupling components in an object-based rendering system comprising: a first network channel coupling a renderer to an array of individually addressable drivers projecting sound in a listening environment and transmitting audio signals and control data from the renderer to the array, and a second network channel coupling a microphone placed in the listening environment to a calibration component of the renderer and transmitting calibration control signals for acoustic information generated by the microphone to the calibration component. The interconnect is suitable for use in a system for rendering spatial audio content comprising channel-based and object-based audio components.
    Type: Grant
    Filed: August 26, 2013
    Date of Patent: April 11, 2017
    Assignee: Dolby Laboratories Licensing Corporation
    Inventors: S. Spencer Hooks, Joshua Brandon Lando, Sripal S. Mehta, Matthew Fellers, Stewart Murrie, Brad Basler
  • Patent number: 9620132
    Abstract: The processing efficiency of a process used to decode frames of an enhanced AC-3 bit stream is improved by processing each audio block in a frame only once. Audio blocks of encoded data are decoded in block order rather than in channel order. Exemplary decoding processes for enhanced bit stream coding features such as adaptive hybrid transform processing and spectral extension are disclosed.
    Type: Grant
    Filed: October 13, 2014
    Date of Patent: April 11, 2017
    Assignee: Dolby Laboratories Licensing Corporation
    Inventor: Kamalanathan Ramamoorthy
  • Patent number: 9622011
    Abstract: Embodiments are described for a system for virtual rendering of object based audio through binaural rendering of each object followed by panning of the resulting stereo binaural signal between a plurality of cross-talk cancelation circuits feeding a corresponding plurality of speaker pairs. In comparison to prior art virtual rendering utilizing a single pair of speakers, the described embodiments improve the spatial impression for both listeners inside and outside of the cross-talk canceller sweet spot. Also described is an improved equalization technique for a crosstalk canceller that is computed from both the crosstalk canceller filters and the binaural filters and applied to a monophonic audio signal being virtualized. The described techniques improve timbre for listeners outside of the sweet-spot as well as a smaller timbre shift when switching from standard rendering to virtual rendering.
    Type: Grant
    Filed: August 20, 2013
    Date of Patent: April 11, 2017
    Assignee: Dolby Laboratories Licensing Corporation
    Inventor: Alan J. Seefeldt
  • Patent number: 9619199
    Abstract: In an audio encoder, for audio content received in a source audio format, default gains are generated based on a default dynamic range compression (DRC) curve, and non-default gains are generated for a non-default gain profile. Based on the default gains and non-default gains, differential gains are generated. An audio signal comprising the audio content, the default DRC curve, and differential gains is generated. In an audio decoder, the default DRC curve and the differential gains are identified from the audio signal. Default gains are re-generated based on the default DRC curve. Based on the combination of the re-generated default gains and the differential gains, operations are performed on the audio content extracted from the audio signal.
    Type: Grant
    Filed: April 14, 2016
    Date of Patent: April 11, 2017
    Assignees: Dolby Laboratories Licensing Corporation, Dolby International AB
    Inventors: Jeroen Koppens, Jeffrey Riedmiller, Kristofer Kjoerling, Alexander Groeschel, Holger Hoerich, Alan J. Seefeldt
  • Patent number: 9619559
    Abstract: Techniques for re-associating dynamic metadata with media data are provided. A media processing system creates, with a first media processing stage, binding information comprising dynamic metadata and a time relationship between the dynamic metadata and media data. The binding information may be derived from the media data. While the first media processing stage delivers the media data to a second media processing stage in a first data path, the first media processing stage passes the binding information to the second media processing stage in a second data path. The media processing system re-associates, with the second media processing stage, the dynamic metadata and the media data using the binding information.
    Type: Grant
    Filed: June 3, 2015
    Date of Patent: April 11, 2017
    Assignee: Dolby Laboratories Licensing Corporation
    Inventors: Wenyu Jiang, Regunthan Radhakrishnan, Claus Bauer
  • Patent number: 9622006
    Abstract: A method for performing linear mixing on coupled Head-related transfer functions (HRTFs) to determine an interpolated HRTF for any specified arrival direction in a range (e.g., a range spanning at least 60 degrees in a plane, or a full range of 360 degrees in a plane), where the coupled HRTFs have been predetermined to have properties such that linear mixing can be performed thereon (to generate interpolated HRTFs) without introducing significant comb filtering distortion. In some embodiments, the method includes steps of: in response to a signal indicative of a specified arrival direction, performing linear mixing on data indicative of coupled HRTFs of a coupled HRTF set to determine an HRTF for the specified arrival direction; and performing HRTF filtering on an audio input signal using the HRTF for the specified arrival direction.
    Type: Grant
    Filed: March 21, 2013
    Date of Patent: April 11, 2017
    Assignee: Dolby Laboratories Licensing Corporation
    Inventor: David S. McGrath
  • Patent number: 9622008
    Abstract: Higher Order Ambisonics (HOA) represents three-dimensional sound. HOA provides high spatial resolution and facilitates analyzing of the sound field with respect to dominant sound sources. The invention aims to identify independent dominant sound sources constituting the sound field, and to track their temporal trajectories. Known applications are searching for all potential candidates for dominant sound source directions by looking at the directional power distribution of the original HOA representation, whereas in the invention all components which are correlated with the signals of previously found sound sources are removed. By such operation the problem of erroneously detecting many instead of only one correct sound source can be avoided in case its contributions to the sound field are highly directionally dispersed.
    Type: Grant
    Filed: February 7, 2014
    Date of Patent: April 11, 2017
    Assignee: Dolby Laboratories Licensing Corporation
    Inventors: Alexander Krueger, Sven Kordon
  • Patent number: 9621990
    Abstract: A method performed by an audio decoder for reconstructing N audio channels from an audio signal containing M audio channels is disclosed. The method includes receiving a bitstream containing an encoded audio signal having M audio channels and a set of spatial parameters, the set of spatial parameters including an inter-channel intensity difference parameter and an inter-channel coherence parameter. The encoded audio bitstream is then decoded to obtain a decoded frequency domain representation of the M audio channels, and at least a portion of the frequency domain representation is decorrelated with an all-pass filter having a fractional delay. The all-pass filter is attenuated at locations of a transient. A matrixed version of the decorrelated signals are summed with a matrixed version of the decoded frequency domain representation to obtain N audio signals that collectively having N audio channels where M is less than N.
    Type: Grant
    Filed: March 24, 2016
    Date of Patent: April 11, 2017
    Assignee: Dolby International AB
    Inventors: Heiko Purnhagen, Lars Villemoes, Jonas Engdegard, Jonas Roeden, Kristofer Kjoerling
  • Patent number: 9622009
    Abstract: Embodiments are described for an adaptive audio system that processes audio data comprising a number of independent monophonic audio streams. One or more of the streams has associated with it metadata that specifies whether the stream is a channel-based or object-based stream. Channel-based streams have rendering information encoded by means of channel name; and the object-based streams have location information encoded through location expressions encoded in the associated metadata. A codec packages the independent audio streams into a single serial bitstream that contains all of the audio data. This configuration allows for the sound to be rendered according to an allocentric frame of reference, in which the rendering location of a sound is based on the characteristics of the playback environment (e.g., room size, shape, etc.) to correspond to the mixer's intent.
    Type: Grant
    Filed: September 12, 2016
    Date of Patent: April 11, 2017
    Assignee: Dolby Laboratories Licensing Corporation
    Inventors: Charles Q. Robinson, Nicolas R. Tsingos, Christophe Chabanne
  • Patent number: 9621963
    Abstract: Essence of a media program can be encoded such that it carries essence identification information and a set of time points. Auxiliary content such as companion content and other auxiliary data can be associated with the essence of the media program by way of the set of time points. The set of time points and/or fingerprints used to retrieve/recover the set of time points can be delivered to one or more of a media device, a companion device/application, etc., in any of a variety of different methods. Through the set of time points and/or fingerprints, and user preferences, the auxiliary content can be retrieved by the one or more of the media device, the companion device/application, etc., presented and/or interacted with a user. In some embodiments, the auxiliary content as described herein can be customized for a specific sender and/or a specific recipient.
    Type: Grant
    Filed: January 27, 2015
    Date of Patent: April 11, 2017
    Assignee: Dolby Laboratories Licensing Corporation
    Inventors: Aaron Steven Master, Jeffrey Riedmiller
  • Patent number: 9621124
    Abstract: Equalizer controller and controlling method are disclosed. In one embodiment, an equalizer controller includes an audio classifier for identifying the audio type of an audio signal in real time; and an adjusting unit for adjusting an equalizer in a continuous manner based on the confidence value of the audio type as identified.
    Type: Grant
    Filed: March 17, 2014
    Date of Patent: April 11, 2017
    Assignee: Dolby Laboratories Licensing Corporation
    Inventors: Lie Lu, Jun Wang, Alan Seefeldt, Mingqing Hu
  • Patent number: 9622014
    Abstract: Embodiments are described for a method and system of rendering and playing back spatial audio content using a channel-based format. Spatial audio content that is played back through legacy channel-based equipment is transformed into the appropriate channel-based format resulting in the loss of certain positional information within the audio objects and positional metadata comprising the spatial audio content. To retain this information for use in spatial audio equipment even after the audio content is rendered as channel-based audio, certain metadata generated by the spatial audio processor is incorporated into the channel-based data. The channel-based audio can then be sent to a channel-based audio decoder or a spatial audio decoder. The spatial audio decoder processes the metadata to recover at least some positional information that was lost during the down-mix operation by upmixing the channel-based audio content back to the spatial audio content for optimal playback in a spatial audio environment.
    Type: Grant
    Filed: June 17, 2013
    Date of Patent: April 11, 2017
    Assignee: Dolby Laboratories Licensing Corporation
    Inventors: Christophe Chabanne, Brett Crockett, Spencer Hooks, Alan Seefeldt, Nicolas R. Tsingos, Mark Tuffy, Rhonda Wilson
  • Publication number: 20170098456
    Abstract: Embodiments of the present invention relate to signal processing. Methods for enhancing intelligibility of speech content in an audio signal are disclosed. One of the methods comprises obtaining reference loudness of the audio signal. The method further comprises enhancing the intelligibility of the speech content by adjusting partial loudness of the audio signal based on the reference loudness and a degree of the intelligibility. Corresponding systems and computer program products are also disclosed.
    Type: Application
    Filed: May 22, 2015
    Publication date: April 6, 2017
    Applicant: DOLBY LABORATORIES LICENSING CORPORATION
    Inventors: Guilin MA, Xiguang ZHENG, C. Phillip BROWN
  • Publication number: 20170099554
    Abstract: Example embodiments disclosed herein relate to modelling a frequency response characteristic of an electro-acoustic transducer. A method includes obtaining at least one measurement of the frequency response characteristic for at least one electro-acoustic transducer of the category. A model of a frequency response characteristic specific to a category of electro-acoustic transducers is generated at least in part based on perceptual importance of a frequency band, an averaged, normalized or microphone compensated measurement such that the distortion of the model is optimized. A further method for estimating a frequency response characteristic of an electro-acoustic transducer is based on the generated model and the sensitivity of the electro-acoustic transducer or headphone. Corresponding system and computer program product are also disclosed.
    Type: Application
    Filed: June 2, 2015
    Publication date: April 6, 2017
    Applicant: DOLBY LABORATORIES LICENSING CORPORATION
    Inventors: Guilin MA, Xiguang ZHENG, C. Phillip BROWN
  • Patent number: 9615169
    Abstract: A communication system for communicating with at least one loudspeaker is described where the loudspeaker is connected to audio equipment over standard two-wire speaker wire operable to carry an audio signal. The communication system includes a master node in electrical communication with a signal path carrying the audio signal between the audio equipment and the loudspeaker, the master node also including an interface with the audio equipment, a data encoder operable to encode data signals, a data transceiver operable to place the data signals onto the audio signal at frequencies above audio frequencies. The communication system also includes at least one slave node in electrical communication with the audio signal and each loudspeaker, the slave node including a data transceiver operable to receive data signals from the master node, a data decoder, and an interface able to communicate with the loudspeaker.
    Type: Grant
    Filed: March 12, 2015
    Date of Patent: April 4, 2017
    Assignee: Dolby Laboratories Licensing Corporation
    Inventor: Joel Butler
  • Patent number: 9613407
    Abstract: A display management processor receives an input image with enhanced dynamic range to be displayed on a target display which has a different dynamic range than a reference display. The input image is first transformed into a perceptually-quantized (PQ) color space. A non-linear mapping function generates a tone-mapped intensity image in response to the characteristics of the source and target display and a measure of the intensity of the PQ image. After a detail-preservation step which may generate a filtered tone-mapped intensity image, an image-adaptive intensity and saturation adjustment step generates an intensity adjustment factor and a saturation adjustment factor as functions of the measure of intensity and saturation of the PQ image, which together with the filtered tone-mapped intensity image are used to generate the output image. Examples of the functions to compute the intensity and saturation adjustment factors are provided.
    Type: Grant
    Filed: June 30, 2015
    Date of Patent: April 4, 2017
    Assignee: Dolby Laboratories Licensing Corporation
    Inventors: Robin Atkins, Samir N. Hulyalkar
  • Publication number: 20170094279
    Abstract: Novel methods and systems for non-backward compatible video encoding are disclosed. The bitrates of the base layer and enhancement layer are dynamically assigned based on features found in scenes in the video compared to a machine learned quality classifier.
    Type: Application
    Filed: September 20, 2016
    Publication date: March 30, 2017
    Applicant: Dolby Laboratories Licensing Corporation
    Inventors: Sankaranarayanan PIRAMANAYAGAM, Hsuan-Ting CHOU, Guan-Ming SU
  • Publication number: 20170094440
    Abstract: A method for creating a head-related impulse response (HRIR) for use in rendering audio for playback through headphones comprises receiving location parameters for a sound including azimuth, elevation, and range relative to a head of a listener, applying a spherical head model to the azimuth, elevation, and range input parameters to generate binaural HRIR values, computing a pinna model using the azimuth and elevation parameters to apply to the binaural HRIR values to pinna modeled HRIR values, computing a torso model using the azimuth and elevation parameters to apply to the pinna modeled HRIR values to generate pinna and torso modeled HRIR values, and computing a near-field model using the azimuth and range parameters to apply to the pinna and torso modeled HRIR values to generate pinna, torso and near-field modeled HRIR values.
    Type: Application
    Filed: March 4, 2015
    Publication date: March 30, 2017
    Applicant: Dolby Laboratories Licensing Corporation
    Inventors: C. Phillip BROWN, Matthew FELLERS, Regunathan RADHAKRISHNAN
  • Publication number: 20170092290
    Abstract: A system and method of mixing narration into content. The system automatically reduces the volume of the content according to a threshold value and a knee value. In this manner, the audio of the content does not overwhelm the narration.
    Type: Application
    Filed: September 21, 2016
    Publication date: March 30, 2017
    Applicant: Dolby Laboratories Licensing Corporation
    Inventor: Suraj Suhas Barkale
  • Patent number: 9608584
    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: April 29, 2016
    Date of Patent: March 28, 2017
    Assignee: Dolby Laboratories Licensing Corporation
    Inventor: Alan Jeffrey Seefeldt
  • Patent number: 9607556
    Abstract: In one embodiment, a dual modulator display systems and methods for rendering target image data upon the dual modulator display system are disclosed where the display system receives target image data, possible HDR image data and first calculates display control signals and then calculates backlight control signals from the display control signals. This order of calculating display signals and then backlight control signals later as a function of the display systems may tend to reduce clipping artifacts. In other embodiments, it is possible to split the input target HDR image data into a base layer and a detail layer, wherein the base layer is the low spatial resolution image data that may be utilized as for backlight illumination data. The detail layer is higher spatial resolution image data that may be utilized for display control data.
    Type: Grant
    Filed: June 10, 2013
    Date of Patent: March 28, 2017
    Assignee: Dolby Laboratories Licensing Corporation
    Inventors: Robin Atkins, Rabab Kreidieh Ward
  • Patent number: 9609344
    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: November 6, 2012
    Date of Patent: March 28, 2017
    Assignee: Dolby International AB
    Inventors: Felix Henry, Gordon Clare
  • Patent number: 9607558
    Abstract: Power levels of a backlight are adjusted in a number of ways and based on a number of criteria. The adjustments result in a lower power consumption and, in some cases, may enhance audience attention to important objects in a scene. The adjustments comprise, for example, a combination of ramping down power (lowering final display brightness) in concert with corresponding compensatory LCD adjustments (increasing final display brightness). The adjustments may also include, for example, system dimming after ramp down/LCD adjustments are exhausted, or the shifting of an LDR2HDR curve.
    Type: Grant
    Filed: February 21, 2014
    Date of Patent: March 28, 2017
    Assignee: Dolby Laboratories Licensing Corporation
    Inventors: Damir Wallener, Neil W. Messmer
  • Patent number: 9609327
    Abstract: An image decoding apparatus that includes a motion compensation prediction circuit configured to conduct motion compensation prediction for each of blocks to be decoded by using the reconstructed image, an inverse transformation circuit configured to conduct inverse orthogonal transformation for the data of the blocks to be decoded, and a determination circuit configured to determine a filtering strength and whether or not to conduct filtering, with respect to each of the boundaries. In addition, the determining circuit is configured to determine filtering is conducted when at least one of the two adjacent blocks is intra-coded, and filtering is not conducted when both of the two adjacent blocks are not intra-coded, a non-zero transformation coefficient is not coded in both of the two adjacent blocks, the two adjacent blocks are predicted by the same reference frame, and an absolute value of a difference between motion vectors of the two adjacent blocks is smaller than a specified threshold value.
    Type: Grant
    Filed: November 3, 2016
    Date of Patent: March 28, 2017
    Assignee: Dolby Laboartories Licensing Corporation
    Inventors: Shijun Sun, Shawmin Lei, Hiroyuki Katata
  • Patent number: 9607364
    Abstract: Novel methods and systems for inverse tone mapping are disclosed. A scene can be analyzed to obtain highlight detection from bright light sources and specular reflections. An inverse tone mapping curve can be calculated based on the lower dynamic range and higher dynamic range displays. Multi-scale filtering can be applied to reduce noise or artifacts.
    Type: Grant
    Filed: November 19, 2014
    Date of Patent: March 28, 2017
    Assignee: Dolby Laboratories Licensing Corporation
    Inventors: Ning Xu, Tao Chen, James E. Crenshaw, Timo Kunkel, Bongsun Lee
  • Patent number: 9607658
    Abstract: Methods and systems for generating and applying scene-stable metadata for a video data stream are disclosed herein. A video data stream is divided or partitioned into scenes and a first set of metadata may be generated for a given scene of video data. The first set of metadata may be any known metadata as a desired function of video content (e.g., luminance). The first set of metadata may be generated on a frame-by-frame basis. In one example, scene-stable metadata may be generated that may be different from the first set of metadata for the scene. The scene-stable metadata may be generated by monitoring a desired feature with the scene and may be used to keep the desired feature within an acceptable range of values. This may help to avoid noticeable and possibly objectionably visual artifacts upon rendering the video data.
    Type: Grant
    Filed: July 28, 2014
    Date of Patent: March 28, 2017
    Assignee: Dolby Laboratories Licensing Corporation
    Inventors: Robin Atkins, Raymond Yeung, Sheng Qu
  • Publication number: 20170084283
    Abstract: The present invention relates to a new method and apparatus for improvement of High Frequency Reconstruction (HFR) techniques using frequency translation or folding or a combination thereof. The proposed invention is applicable to audio source coding systems, and offers significantly reduced computational complexity. This is accomplished by means of frequency translation or folding in the subband domain, preferably integrated with spectral envelope adjustment in the same domain. The concept of dissonance guard-band filtering is further presented. The proposed invention offers a low-complexity, intermediate quality HFR method useful in speech and natural audio coding applications.
    Type: Application
    Filed: December 6, 2016
    Publication date: March 23, 2017
    Applicant: Dolby International AB
    Inventors: Lars G. Liljeryd, Per Ekstrand, Fredrik Henn, Kristofer Kjoerling
  • Publication number: 20170086008
    Abstract: A method of rendering an audio program by generating one or more loudspeaker channel feeds based on the dynamic trajectory of each audio object in the audio program, wherein the parameters of the dynamic trajectory may be included explicitly in the audio program, or may be derived from the instantaneous location of audio objects at two or more points in time. Embodiments include rendering audio by defining a nominal loudspeaker map of loudspeakers used for playback of the audio program, determining a trajectory of an auditory source corresponding to one or more audio objects through 3D space, generating loudspeaker signals feeding the loudspeakers based on the one or more audio object trajectories, and rendering the one or more audio objects based on object location to match the trajectory of the auditory source as perceived by a listener.
    Type: Application
    Filed: September 21, 2016
    Publication date: March 23, 2017
    Applicant: Dolby Laboratories Licensing Corporation
    Inventor: Charles Q. Robinson
  • Publication number: 20170086007
    Abstract: Improved tools for authoring and rendering audio reproduction data are provided. Some such authoring tools allow audio reproduction data to be generalized for a wide variety of reproduction environments. Audio reproduction data may be authored by creating metadata for audio objects. The metadata may be created with reference to speaker zones. During the rendering process, the audio reproduction data may be reproduced according to the reproduction speaker layout of a particular reproduction environment.
    Type: Application
    Filed: December 2, 2016
    Publication date: March 23, 2017
    Applicant: Dolby Laboratories Licensing Corporation
    Inventors: Nicolas R. TSINGOS, Charles Q. ROBINSON, Jurgen W. SCHARPF
  • Publication number: 20170085918
    Abstract: Video data with both ultra-high definition (UHD) resolution and high or enhanced dynamic range (EDR) data are coded in a backward-compatible layered stream which allows legacy decoders to extract an HD standard dynamic range (SDR) signal. In response to a base layer HD SDR signal, a predicted signal is generated using separate luma and chroma prediction models. In the luma predictor, luma pixel values of the predicted signal are computed based only on luma pixel values of the base layer, while in the chroma predictor, chroma pixel values of the predicted signal are computed based on both the luma and the chroma pixel values of the base layer. A residual signal is computed based on the input UHD EDR signal and the predicted signal. The base layer and the residual signal are coded separately to form a coded bitstream. A compatible dual-layer decoder is also presented.
    Type: Application
    Filed: December 6, 2016
    Publication date: March 23, 2017
    Applicant: Dolby Laboratories Licensing Corporation
    Inventors: Guan-Ming SU, Robin ATKINS, Qian CHEN
  • Publication number: 20170084281
    Abstract: A method and system for reconstructing an original audio signal is disclosed. The original audio signal has a baseband up to a cutoff frequency and high-frequency components not included in the baseband above the cutoff frequency. The system includes a bitstream deformatter that extracts a representation of the baseband, an estimated spectral envelope, and noise-blending parameters from an audio bitstream. The system also includes a spectral component regenerator that copies or translates all or at least some of the baseband spectral components to non-overlapping frequency ranges of the high-frequency components not included in the baseband to generate regenerated spectral components. The system further includes a gain adjuster that modifies a spectral envelope of the regenerated spectral components based at least in part on the estimated spectral envelope and the noise-blending parameters to generate gain-adjusted regenerated spectral components.
    Type: Application
    Filed: December 6, 2016
    Publication date: March 23, 2017
    Applicant: Dolby Laboratories Licensing Corporation
    Inventors: Michael M. Truman, Mark S. Vinton
  • Patent number: D784360
    Type: Grant
    Filed: May 21, 2014
    Date of Patent: April 18, 2017
    Assignee: Dolby International AB
    Inventors: Sigrid Harder, Robert Andrew France, Thomas Ziegler, Radoslaw Musial, Christopher Oates
  • Patent number: RE46370
    Abstract: Embodiments of the present invention comprise systems and methods for processing of data related to video wherein reduced bit depth intermediate calculations are enabled.
    Type: Grant
    Filed: March 12, 2014
    Date of Patent: April 18, 2017
    Assignee: Dolby Laboratories Licensing Corporation
    Inventor: Louis J. Kerofsky