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: 20180109874
    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: Application
    Filed: December 14, 2017
    Publication date: April 19, 2018
    Applicant: Dolby Laboratories Licensing Corporation
    Inventors: Guilin MA, Xiguang ZHENG, Chen ZHANG, Xuejing SUN
  • Publication number: 20180108366
    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: Application
    Filed: December 15, 2017
    Publication date: April 19, 2018
    Applicant: DOLBY INTERNATIONAL AB
    Inventor: Lars VILLEMOES
  • Publication number: 20180108362
    Abstract: A method for compressing a HOA signal being an input HOA representation with input time frames (C(k)) of HOA coefficient sequences comprises spatial HOA encoding of the input time frames and subsequent perceptual encoding and source encoding. Each input time frame is decomposed (802) into a frame of predominant sound signals (XPS(k?1)) and a frame of an ambient HOA component ({tilde over (C)}AMB(k?1)). The ambient HOA component ({tilde over (C)}AMB(k?1)) comprises, in a layered mode, first HOA coefficient sequences of the input HOA representation (cn(k?1)) in lower positions and second HOA coefficient sequences (cAMB,n(k?1)) in remaining higher positions. The second HOA coefficient sequences are part of an HOA representation of a residual between the input HOA representation and the HOA representation of the predominant sound signals.
    Type: Application
    Filed: September 22, 2017
    Publication date: April 19, 2018
    Applicant: Dolby Laboratories Licensing Corporation
    Inventors: Sven Kordon, Alexander Krueger, Oliver Wuebbolt
  • Publication number: 20180109895
    Abstract: Audio signals (201) are received. The audio signals include left and right surround channels (206). The audio signals are played back using far-field loudspeakers (101-108, 401-406) distributed around a space (111, 409) having a plurality of listener positions (112, 410). The left and right surround channels are played back by a pair of far-field loudspeakers (103, 106, 403, 405) arranged at opposite sides of the space having the plurality of listener positions. An audio component (208) coinciding with or approximating audio content common to the left and right surround channels is obtained. The audio component is played back using at least a pair of near-field transducers (109, 110, 407, 408) arranged at one of the listener positions. Associated systems (100, 400), methods (800) and computer program products are provided.
    Type: Application
    Filed: May 12, 2016
    Publication date: April 19, 2018
    Applicant: Dolby Laboratories Licensing Corporation
    Inventors: Remi AUDFRAY, Nicolas R. TSINGOS, Jurgen W. SCHARPF
  • Publication number: 20180109894
    Abstract: Audio perception in local proximity to visual cues is provided. A device includes a video display, first row of audio transducers, and second row of audio transducers. The first and second rows can be vertically disposed above and below the video display. An audio transducer of the first row and an audio transducer of the second row form a column to produce, in concert, an audible signal. The perceived emanation of the audible signal is from a plane of the video display (e.g., a location of a visual cue) by weighing outputs of the audio transducers of the column. In certain embodiments, the audio transducers are spaced farther apart at a periphery for increased fidelity in a center portion of the plane and less fidelity at the periphery.
    Type: Application
    Filed: October 19, 2016
    Publication date: April 19, 2018
    Applicant: DOLBY LABORATORIES LICENSING CORPORATION
    Inventors: Christophe Chabanne, Nicolas R. Tsingos, Charles Q. Robinson
  • Publication number: 20180108364
    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: Application
    Filed: December 18, 2017
    Publication date: April 19, 2018
    Applicant: DOLBY INTERNATIONAL AB
    Inventors: HEIKO PURNHAGEN, HARALD MUNDT, KRISTOFER KJOERLING
  • Publication number: 20180109897
    Abstract: A multi-channel decoder for generating a binaural signal from a downmix signal using upmix rule information on an energy-error introducing upmix rule for calculating a gain factor based on the upmix rule information and characteristics of head related transfer function based filters corresponding to upmix channels. The one or more gain factors are used by a filter processor for filtering the downmix signal so that an energy corrected binaural signal having a left binaural channel and a right binaural channel is obtained.
    Type: Application
    Filed: December 15, 2017
    Publication date: April 19, 2018
    Applicant: DOLBY INTERNATIONAL AB
    Inventor: Lars VILLEMOES
  • Publication number: 20180109898
    Abstract: A multi-channel decoder for generating a binaural signal from a downmix signal using upmix rule information on an energy-error introducing upmix rule for calculating a gain factor based on the upmix rule information and characteristics of head related transfer function based filters corresponding to upmix channels. The one or more gain factors are used by a filter processor for filtering the downmix signal so that an energy corrected binaural signal having a left binaural channel and a right binaural channel is obtained.
    Type: Application
    Filed: December 15, 2017
    Publication date: April 19, 2018
    Applicant: DOLBY INTERNATIONAL AB
    Inventor: Lars VILLEMOES
  • Patent number: 9948931
    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: February 13, 2017
    Date of Patent: April 17, 2018
    Assignee: Dolby Laboratories Licensing Corporation
    Inventors: Stephen Gordon, Douglas Chin
  • Patent number: 9947328
    Abstract: According to an aspect of the present invention, a method for reconstructing an audio signal having a baseband portion and a highband portion is disclosed. The method includes obtaining a decoded baseband audio signal by decoding an encoded audio signal and obtaining a plurality of subband signals by filtering the decoded baseband audio signal. The method further includes generating a high-frequency reconstructed signal by copying a number of consecutive subband signals of the plurality of subband signals and obtaining an envelope adjusted high-frequency signal. The method further includes generating a noise component based on a noise parameter. Finally, the method includes adjusting a phase of the high-frequency reconstructed signal and obtaining a time-domain reconstructed audio signal by combining the decoded baseband audio signal and the combined high-frequency signal to obtain a time-domain reconstructed audio signal.
    Type: Grant
    Filed: September 12, 2017
    Date of Patent: April 17, 2018
    Assignee: Dolby Laboratories Licensing Corporation
    Inventors: Michael M. Truman, Mark S. Vinton
  • Patent number: 9947335
    Abstract: Embodiments are directed to a companding method and system for reducing coding noise in an audio codec. A compression process reduces an original dynamic range of an initial audio signal through a compression process that divides the initial audio signal into a plurality of segments using a defined window shape, calculates a wideband gain in the frequency domain using a non-energy based average of frequency domain samples of the initial audio signal, and applies individual gain values to amplify segments of relatively low intensity and attenuate segments of relatively high intensity. The compressed audio signal is then expanded back to substantially the original dynamic range that applies inverse gain values to amplify segments of relatively high intensity and attenuating segments of relatively low intensity. A QMF filterbank is used to analyze the initial audio signal to obtain a frequency domain representation.
    Type: Grant
    Filed: April 1, 2014
    Date of Patent: April 17, 2018
    Assignees: Dolby Laboratories Licensing Corporation, Dolby International AB
    Inventors: Per Hedelin, Arijit Biswas, Michael Schug, Vinay Melkote
  • Patent number: 9948955
    Abstract: In a video processing system, a method and system for generating a transform size syntax element for video decoding are provided. For high profile mode video decoding operations, the transform sizes may be selected based on the prediction macroblock type and the contents of the macroblock. A set of rules may be utilized to select from a 4.×.4 or an 8.×.8 transform size during the encoding operation. Dynamic selection of transform size may be performed on intra-predicted macroblocks, inter-predicted macroblocks, and/or direct mode inter-predicted macroblocks. The encoding operation may generate a transform size syntax element to indicate the transform size that may be used in reconstructing the encoded macroblock. The transform size syntax element may be transmitted to a decoder as part of the encoded video information bit stream.
    Type: Grant
    Filed: January 23, 2017
    Date of Patent: April 17, 2018
    Assignee: Dolby Laboratories Licensing Corporation
    Inventors: Stephen Gordon, Douglas Chin
  • Patent number: 9947336
    Abstract: The present application provides an acoustic echo mitigation apparatus and method, an audio processing apparatus and a voice communication terminal. According to an embodiment, an acoustic echo mitigation apparatus is provided, including: an acoustic echo canceller for cancelling estimated acoustic echo from a microphone signal and outputting an error signal; a residual echo estimator for estimating residual echo power; and an acoustic echo suppressor for further suppressing residual echo and noise in the error signal based on the residual echo power and noise power. Here, the residual echo estimator is configured to be continuously adaptive to power change in the error signal. According to the embodiments of the present application, the acoustic echo mitigation apparatus and method can, at least, be well adaptive to the change of power of the error signal after the AEC processing, such as that caused by change of double-talk status, echo path properties, noise level and etc.
    Type: Grant
    Filed: March 10, 2014
    Date of Patent: April 17, 2018
    Assignee: Dolby Laboratories Licensing Corporation
    Inventors: Dong Shi, Xuejing Sun, Glenn N. Dickins
  • Patent number: 9949052
    Abstract: An audio object including audio content and object metadata is received. The object metadata indicates an object spatial position of the audio object to be rendered by audio speakers in a playback environment. Based on the object spatial position and source spatial positions of the audio speakers, initial gain values for the audio speakers are determined. The initial gain values can be used to select a set of audio speakers from among the audio speakers. Based on the object spatial position and a set of source spatial positions at which the set of audio speakers are respectively located in the playback environment, a set of non-negative optimized gain values for the set of audio speakers is determined. The audio object at the object spatial position is rendered with the set of optimized gain values for the set of audio speakers.
    Type: Grant
    Filed: March 6, 2017
    Date of Patent: April 17, 2018
    Assignees: Dolby Laboratories Licensing Corporation, Dolby International AB
    Inventors: Jun Wang, Giulio Cengarle, Juan Felix Torres, Daniel Arteaga
  • Publication number: 20180103333
    Abstract: Embodiments of the example embodiment relate to audio object extraction. A method for audio object extraction from audio content is disclosed. The method comprises determining a sub-band object probability for a sub-band of the audio signal in a frame of the audio content, the sub-band object probability indicating a probability of the sub-band of the audio signal containing an audio object. The method further comprises splitting the sub-band of the audio signal into an audio object portion and a residual audio portion based on the determined sub-band object probability. Corresponding system and computer program product are also disclosed.
    Type: Application
    Filed: October 16, 2017
    Publication date: April 12, 2018
    Applicant: Dolby Laboratories Licensing Corporation
    Inventors: Lianwu CHEN, Lie LU
  • Publication number: 20180103253
    Abstract: Methods to improve the quality of coding high-dynamic range (HDR) signals are presented. Instead of using a single chroma quantization table for all color formats, a video encoder may adaptively use separate tables for each one, and transmit the table's ID to a decoder. Examples for chroma quantization tables for video content encoded in the YCbCr (PQ) and ICtCp (PQ) color formats under a variety of color gamut containers are provided.
    Type: Application
    Filed: October 10, 2017
    Publication date: April 12, 2018
    Applicant: DOLBY LABORATORIES LICENSING CORPORATION
    Inventors: Taoran LU, Fangjun PU, Peng YIN, Tao CHEN
  • Patent number: 9940942
    Abstract: The present document relates an audio encoding and decoding system (referred to as an audio codec system). In particular, the present document relates to a transform-based audio codec system which is particularly well suited for voice encoding/decoding. A quantization unit configured to quantize a first coefficient of a block of coefficients is described. The block of coefficients comprises a plurality of coefficients for a plurality of corresponding frequency bins. The quantization unit is configured to provide a set of quantizers. The set of quantizers comprises a plurality of different quantizers associated with a plurality of different signal-to-noise ratios, referred to as SNR, respectively. The plurality of different quantizers includes a noise-filling quantizer; one or more dithered quantizers; and one or more un-dithered quantizers.
    Type: Grant
    Filed: April 4, 2014
    Date of Patent: April 10, 2018
    Assignee: Dolby International AB
    Inventors: Janusz Klejsa, Lars Villemoes, Per Hedelin
  • Patent number: 9940881
    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 into second light. The light conversion layer can include quantum dots or phosphor materials. Modulation drive signals are generated to determine transmission of the second light through individual subpixels of the display. These modulation drive signals can be adjusted based on one or more light field simulations. The light field simulations can include: (i) a color shift for a pixel based on a point spread function of the illumination sources; (ii) binning difference of individual illumination sources; (iii) temperature dependence of display components on performance; or (iv) combinations thereof.
    Type: Grant
    Filed: February 13, 2014
    Date of Patent: April 10, 2018
    Assignee: Dolby Laboratories Licensing Corporation
    Inventors: Ajit Ninan, Chun Chi Wan
  • Patent number: 9940939
    Abstract: The present disclosure provides methods, devices and computer program products for encoding and decoding of a vector of parameters in an audio coding system. The disclosure further relates to a method and apparatus for reconstructing an audio object in an audio decoding system. According to the disclosure, a modulo differential approach for coding and encoding a vector of a non-periodic quantity may improve the coding efficiency and provide encoders and decoders with less memory requirements. Moreover, an efficient method for encoding and decoding a sparse matrix is provided.
    Type: Grant
    Filed: July 6, 2017
    Date of Patent: April 10, 2018
    Assignee: Dolby International AB
    Inventors: Leif Jonas Samuelsson, Heiko Purnhagen
  • Patent number: 9942688
    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: August 9, 2017
    Date of Patent: April 10, 2018
    Assignee: Dolby Laboraties Licensing Corporation
    Inventors: Charles Q. Robinson, Nicolas R. Tsingos, Christophe Chabanne
  • Patent number: 9942559
    Abstract: A system for decoding a video bitstream includes receiving a frame of the video that includes at least one slice and at least one tile and where each of the at least one slice and the at least one tile are not all aligned with one another.
    Type: Grant
    Filed: April 12, 2017
    Date of Patent: April 10, 2018
    Assignee: Dolby International AB
    Inventor: Sachin G. Deshpande
  • Patent number: 9938738
    Abstract: The present disclosure is directed to an entrance to a theater of the type normally used to show motion pictures. The motion picture theater entrance has distinctive outer walls separating a vestibule from a lobby. The vestibule has a curved image projection wall located inside said vestibule and is connected to a viewing area by a curved walkway. The entrance also may include border lighting along the upper and or lower edges of its walls.
    Type: Grant
    Filed: December 9, 2016
    Date of Patent: April 10, 2018
    Assignee: DOLBY LABORATORIES LICENSING CORPORATION
    Inventors: Wilhelm Oehl, David Herman, Vincent Voron, Donald Burlock, Pascal Sijen, Christopher Roy Kukshtel
  • Patent number: 9940941
    Abstract: The invention provides an efficient implementation of cross-product enhanced high-frequency reconstruction (HFR), wherein a new component at frequency Q?+r?0 is generated on the basis of existing components at ? and ?+?0. The invention provides a block-based harmonic transposition, wherein a time block of complex subband samples is processed with a common phase modification. Superposition of several modified samples has the net effect of limiting undesirable intermodulation products, thereby enabling a coarser frequency resolution and/or lower degree of oversampling to be used. In one embodiment, the invention further includes a window function suitable for use with block-based cross-product enhanced HFR. A hardware embodiment of the invention may include an analysis filter bank, a subband processing unit configurable by control data and a synthesis filter bank.
    Type: Grant
    Filed: April 6, 2017
    Date of Patent: April 10, 2018
    Assignee: Dolby International AB
    Inventor: Lars Villemoes
  • Patent number: 9942449
    Abstract: Novel methods and systems for image processing and gamut mapping are disclosed, where image parameters in a first color space are transformed into parameters in a second color space. In one example, the gamut mapping system processes the image parameters in a parametrized space using substantially rectangular spectral functions. In another example, the gamut mapping system processes the image parameters in a parametrized space using smooth spectral functions. The smooth spectral functions may include a linear combination of functions, including at least a cosine square function. Image parameters may include an intensity parameter, a center wavelength parameter, and a saturation parameter.
    Type: Grant
    Filed: August 20, 2014
    Date of Patent: April 10, 2018
    Assignee: Dolby Laboratories Licensing Corporation
    Inventor: Walter Gish
  • Publication number: 20180098094
    Abstract: An SDR CDF is constructed based on an SDR histogram generated from a distribution of SDR codewords in SDR images. An HDR CDF is constructed based on an HDR histogram generated from a distribution of HDR codewords in HDR images that correspond to the SDR images. A histogram transfer function is generated based on the SDR CDF and the HDR CDF. The SDR images are transmitted along with backward reshaping metadata to recipient devices. The backward reshaping metadata is generated at least in part on the histogram transfer function.
    Type: Application
    Filed: October 4, 2017
    Publication date: April 5, 2018
    Applicant: Dolby Laboratories Licensing Corporation
    Inventors: Bihan WEN, Harshad KADU, Guan-Ming SU
  • Publication number: 20180098169
    Abstract: A multi-channel decoder for generating a binaural signal from a downmix signal using upmix rule information on an energy-error introducing upmix rule for calculating a gain factor based on the upmix rule information and characteristics of head related transfer function based filters corresponding to upmix channels. The one or more gain factors are used by a filter processor for filtering the downmix signal so that an energy corrected binaural signal having a left binaural channel and a right binaural channel is obtained.
    Type: Application
    Filed: November 21, 2017
    Publication date: April 5, 2018
    Applicant: DOLBY INTERNATIONAL AB
    Inventor: Lars VILLEMOES
  • Publication number: 20180095718
    Abstract: Embodiments are directed to a method and system for receiving, in a bitstream, metadata associated with the audio data, and analyzing the metadata to determine whether a loudness parameter for a first group of audio playback devices are available in the bitstream. Responsive to determining that the parameters are present for the first group, the system uses the parameters and audio data to render audio. Responsive to determining that the loudness parameters are not present for the first group, the system analyzes one or more characteristics of the first group, and determines the parameter based on the one or more characteristics.
    Type: Application
    Filed: December 7, 2017
    Publication date: April 5, 2018
    Applicants: Dolby Laboratories Licensing Corporation, DOLBY INTERNATIONAL AB
    Inventors: Jeffrey RIEDMILLER, Scott Gregory NORCROSS, Karl Jonas ROEDEN
  • Publication number: 20180098046
    Abstract: Given existing color remapping information (CRI) messaging variables, methods are described to communicate color volume information for a targeted display to a downstream receiver. Bits 7:0 of the 32-bit colour_remap_id are used to extract a first value. If the first value is not a reserved value, then the first value is used as an index to a look-up table to generate a first luminance value for a targeted display, otherwise a second value is generated based on bits 31:9 in the colour_remap_id messaging variable and the first luminance value for a targeted display is generated based on the second value. The methods may be applied to communicate via CRI messaging a minimum luminance value, a maximum luminance value, and color primaries information of the targeted display.
    Type: Application
    Filed: October 3, 2017
    Publication date: April 5, 2018
    Applicant: Dolby Laboratories Licensing Corporation
    Inventors: Walter J. Husak, Robin Atkins, Peng Yin, Taoran Lu, Tao Chen
  • Publication number: 20180096692
    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: Application
    Filed: November 22, 2017
    Publication date: April 5, 2018
    Applicant: DOLBY INTERNATIONAL AB
    Inventors: Heiko PURNHAGEN, Kristofer KJOERLING, Toni HIRVONEN, Lars VILLEMOES, Dirk Jeroen BREEBAART
  • Publication number: 20180098170
    Abstract: A multi-channel decoder for generating a binaural signal from a downmix signal using upmix rule information on an energy-error introducing upmix rule for calculating a gain factor based on the upmix rule information and characteristics of head related transfer function based filters corresponding to upmix channels. The one or more gain factors are used by a filter processor for filtering the downmix signal so that an energy corrected binaural signal having a left binaural channel and a right binaural channel is obtained.
    Type: Application
    Filed: November 22, 2017
    Publication date: April 5, 2018
    Applicant: DOLBY INTERNATIONAL AB
    Inventor: Lars VILLEMOES
  • Patent number: 9936321
    Abstract: Dynamic Range Control (DRC) cannot be simply applied to Higher Order Ambisonics (HOA) based signals. A method for performing DRC on a HOA signal comprises transforming the HOA signal to the spatial domain, analyzing the transformed HOA signal, and obtaining, from results of said analyzing, gain factors that are usable for dynamic compression. The gain factors can be transmitted together with the HOA signal. When applying the DRC, the HOA signal is transformed to the spatial domain, the gain factors are extracted and multiplied with the transformed HOA signal in the spatial domain, wherein a gain compensated transformed HOA signal is obtained. The gain compensated transformed HOA signal is transformed back into the HOA domain, wherein a gain compensated HOA signal is obtained.
    Type: Grant
    Filed: March 24, 2015
    Date of Patent: April 3, 2018
    Assignee: Dolby Laboratories Licensing Corporation
    Inventors: Johannes Boehm, Florian Keiler
  • Patent number: 9933989
    Abstract: Embodiments are described for a method of rendering audio for playback through headphones comprising receiving digital audio content, receiving binaural rendering metadata generated by an authoring tool processing the received digital audio content, receiving playback metadata generated by a playback device, and combining the binaural rendering metadata and playback metadata to optimize playback of the digital audio content through the headphones.
    Type: Grant
    Filed: October 28, 2014
    Date of Patent: April 3, 2018
    Assignee: Dolby Laboratories Licensing Corporation
    Inventors: Nicolas R. Tsingos, Rhonda Wilson, Sunil Bharitkar, C. Phillip Brown, Alan J. Seefeldt, Remi Audfray
  • Patent number: 9935599
    Abstract: Distortion reducing multi-hand compressor with timbre preservation is provided. Timbre preservation is achieved by determining a time-varying threshold in each of a plurality frequency bands as a function of a respective fixed threshold for the frequency band and, at least in part, an audio signal level and a fixed threshold outside such frequency band. If a particular frequency band receives significant gain reduction due to being above or approaching its fixed threshold, then a time-varying threshold of one or more other frequency bands are also decreased to receive some gain reduction. In a specific embodiment, time-varying thresholds can be computed from an average difference of the audio input signal in each frequency band and its respective fixed threshold.
    Type: Grant
    Filed: April 26, 2016
    Date of Patent: April 3, 2018
    Assignee: Dolby Laboratories Licensing Corporation
    Inventor: Alan J. Seefeldt
  • Patent number: 9934733
    Abstract: Apparatus and methods are provided that employ one or more of a variety of techniques for reducing the time required to display high resolution images on a high dynamic range display having a light source layer and a display layer. In one technique, the image resolution is reduced, an effective luminance pattern is determined for the reduced resolution image, and the resolution of the effective luminance pattern is then increased to the resolution of the—display layer. In another technique, the light source layer's point spread function is decomposed into a plurality of components, and an effective luminance pattern is determined for each component. The effective luminance patterns are then combined to produce a total effective luminance pattern. Additional image display time reduction techniques are provided.
    Type: Grant
    Filed: October 3, 2016
    Date of Patent: April 3, 2018
    Assignee: Dolby Laboratories Licensing Corporation
    Inventors: Lorne A. Whitehead, Helge Seetzen, Gregory John Ward, Wolfgang Heidrich
  • Patent number: 9936199
    Abstract: Compared to traditional gamma-coded video, perceptually quantized video provides greater flexibility for the transmission and display management of high-dynamic range video, but it does not compresses as efficiently using existing standard codecs. Techniques are described to improve the coding efficiency of perceptually coded video by applying a color cross-talk transformation after the RGB/XYZ to LMS transformation. Such a transform increases luma and chroma correlation for color appearance models, but improves perceptual uniformity and overall coding efficiency for wide color gamut, HDR, signals.
    Type: Grant
    Filed: September 24, 2015
    Date of Patent: April 3, 2018
    Assignee: Dolby Laboratories Licensing Corporation
    Inventors: Jan Froehlich, Robin Atkins, Qiuwei Wang, Guan-Ming Su, Peng Yin
  • Publication number: 20180091914
    Abstract: A multi-channel decoder for generating a binaural signal from a downmix signal using upmix rule information on an energy-error introducing upmix rule for calculating a gain factor based on the upmix rule information and characteristics of head related transfer function based filters corresponding to upmix channels. The one or more gain factors are used by a filter processor for filtering the downmix signal so that an energy corrected binaural signal having a left binaural channel and a right binaural channel is obtained.
    Type: Application
    Filed: November 21, 2017
    Publication date: March 29, 2018
    Applicant: Dolby International AB
    Inventor: Lars Villemoes
  • Publication number: 20180091803
    Abstract: A projection display system includes a spatial modulator that is controlled to compensate for flare in a lens of the projector. The spatial modulator increases achievable intra-frame contrast and facilitates increased peak luminance without unacceptable black levels. Some embodiments provide 3D projection systems in which the spatial modulator is combined with a polarization control panel.
    Type: Application
    Filed: November 29, 2017
    Publication date: March 29, 2018
    Applicant: Dolby Laboratories Licensing Corporation
    Inventors: Gregory John Ward, Robin Atkins
  • Patent number: 9930464
    Abstract: A method for compressing a HOA signal being an input HOA representation with input time frames (C(k)) of HOA coefficient sequences comprises spatial HOA encoding of the input time frames and subsequent perceptual encoding and source encoding. Each input time frame is decomposed (802) into a frame of predominant sound signals (XPS(k?1)) and a frame of an ambient HOA component (CAMB (k?1)). The ambient HOA component (CAMB (k?1)) comprises, in a layered mode, first HOA coefficient sequences of the input HOA representation (cn(k?1)) in lower positions and second HOA coefficient sequences (CAMB,n(k?1)) in remaining higher positions. The second HOA coefficient sequences are part of an HOA representation of a residual between the input HOA representation and the HOA representation of the predominant sound signals.
    Type: Grant
    Filed: March 20, 2015
    Date of Patent: March 27, 2018
    Assignee: Dolby Laboratories Licensing Corporation
    Inventors: Sven Kordon, Alexander Krueger, Oliver Wuebbolt
  • Patent number: 9930369
    Abstract: A method for decoding a video bitstream is disclosed. The method comprises: entropy decoding a first portion of a video bitstream, wherein first portion of video bitstream is associated with a video frame, thereby producing a first portion of decoded data; entropy decoding a second portion of video bitstream, wherein second portion of video bitstream is associated with video frame, thereby producing a second portion of decoded data, wherein entropy decoding second portion of video bitstream is independent of entropy decoding first portion of video bitstream; and reconstructing a first portion of video frame associated with video bitstream using first portion of decoded data and second portion of decoded data.
    Type: Grant
    Filed: April 20, 2017
    Date of Patent: March 27, 2018
    Assignee: Dolby International AB
    Inventors: Jie Zhao, Christopher A. Segall, Louis J. Kerofsky
  • Patent number: 9930465
    Abstract: In an encoding section (100), a downmix section (110) forms first and second channels (L1, L2) of a downmix signal as linear combinations of first and second groups (401, 402) of channels, respectively, of an M-channel audio signal; and an analysis section (120) determines upmix parameters (?LU) for parametric reconstruction of the audio signal, and mixing parameters (?LM). In a decoding section (1200), a decorrelating section (1210) outputs a decorrelated signal (D) based on the downmix signal; and a mixing section (1220) determines mixing coefficients based on the mixing parameters or the upmix parameters, and forms a K-channel output signal ({tilde over (L)}1, . . . , {tilde over (L)}K) as a linear combination of the downmix signal and the decorrelated signal in accordance with the mixing coefficients. The channels of the output signal approximate linear combinations of K groups (501-502, 1301-1303) of channels, respectively, of the audio signal.
    Type: Grant
    Filed: October 28, 2015
    Date of Patent: March 27, 2018
    Assignee: Dolby International AB
    Inventors: Lars Villemoes, Heiko Purnhagen, Heidi-Maria Lehtonen
  • Patent number: 9927568
    Abstract: An apparatus comprising a light source (110), one or more light guides (104), and a light diffuser (102) having an integration chamber (114) surrounded by one or more light diffusive areas (108). The one or more light diffusive areas are configured with one or more first openings as one or more ingress areas (112) to receive light from the light source and one or more second openings as one or more egress areas (106) to provide light to the one or more light guides. For illuminating visual indicators with uniform light.
    Type: Grant
    Filed: November 12, 2014
    Date of Patent: March 27, 2018
    Assignee: Dolby Laboratories Licensing Corporation
    Inventors: Ajit Ninan, Chun Chi Wan
  • Patent number: 9930339
    Abstract: Methods and systems for improving coding decoding efficiency of video by providing a syntax modeler, a buffer, and a decoder. The syntax modeler may associate a first sequence of symbols with syntax elements. The buffer may store tables, each represented by a symbol in the first sequence, and each used to associate a respective symbol in a second sequence of symbols with encoded data. The decoder decodes the data into a bitstream using the second sequence retrieved from a table.
    Type: Grant
    Filed: June 15, 2017
    Date of Patent: March 27, 2018
    Assignee: Dolby International AB
    Inventors: Yeping Su, Christopher A. Segall
  • Publication number: 20180082429
    Abstract: Motion characteristics related to the images are determined. A motion characteristics metadata portion is generated based on the motion characteristics, and is to be used for determining an optimal FRC operational mode with a downstream device for the images. The images are encoded into a video stream. The motion characteristics metadata portion is encoded into the video stream as a part of image metadata. The video stream is transmitted to the downstream device. The downstream receives the video stream and operates the optimal FRC operational mode to generate, based on the images, additional images. The images and the additional images are rendered on a display device at an image refresh rate different from an input image refresh rate represented by images encoded in the video stream.
    Type: Application
    Filed: September 13, 2017
    Publication date: March 22, 2018
    Applicant: Dolby Laboratories Licensing Corporation
    Inventors: Anustup Kumar Atanu Choudhury, Tao Chen, Robin Atkins, Samir N. Hulyalkar
  • Publication number: 20180082698
    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 1, 2017
    Publication date: March 22, 2018
    Applicant: Dolby International AB
    Inventors: Kristofer KJOERLING, Lars VILLEMOES
  • Publication number: 20180082658
    Abstract: Methods for designing metamerically stable RGBW displays are presented. Display parameters are selected so that given a reference spectral power distribution (SPD) for the white color primary (e.g., one based on D65), and a test spectral power distribution for the white color primary, deviations in color appearance measurements between the two SPDs among N different observers are minimized. Given a display with a metamerically stable white (W), given linear input R, G, and B values, output R, G, B, and W values are generated to optimize metameric stability instead of reducing power consumption or to increase total brightness.
    Type: Application
    Filed: September 14, 2017
    Publication date: March 22, 2018
    Applicant: Dolby Laboratories Licensing Corporation
    Inventor: Robin ATKINS
  • Publication number: 20180082695
    Abstract: Disclosed is a system and computer program product of encoding audio content and corresponding method. The method includes determining a characteristic of the audio content, the characteristic of the audio content including at least one of a type or a property of the audio content. Also the method includes classifying the audio content based on the characteristic of the audio content and determining probabilities for multiple predefined audio coding symbols associated with the audio content by calculating a probability for each of the audio coding symbols based on the result of the classification, the probability for an audio coding symbol indicating a frequency at which the audio coding symbol occurs in the audio content. Further, the method encoded the audio content based on the audio coding symbols and the corresponding probabilities to obtain a code value, the code value representing a compression coding format of the audio content.
    Type: Application
    Filed: April 13, 2016
    Publication date: March 22, 2018
    Applicants: DOLBY LABORATORIES LICENSING CORPORATION, DOLBY INTERNATIONAL AB
    Inventors: Xuejing SUN, Dong SHI, Janusz KLEJSA
  • Patent number: 9924171
    Abstract: Techniques use multiple lower bit depth (e.g., 8 bits) codecs to provide higher bit depth (e.g., 12+ bits) high dynamic range images from an upstream device to a downstream device. Multiple layers comprising a base layer and one or more enhancement layers may be used to carry video signals comprising image data compressed by lower bit depth encoders to a downstream device, wherein the base layer cannot be decoded and viewed on its own. Lower bit depth input image data to base layer processing may be generated from higher bit depth high dynamic range input image data via advanced quantization to minimize the volume of image data to be carried by enhancement layer video signals. The image data in the enhancement layer video signals may comprise residual values, quantization parameters, and mapping parameters based in part on a prediction method corresponding to a specific method used in the advanced quantization.
    Type: Grant
    Filed: September 29, 2016
    Date of Patent: March 20, 2018
    Assignee: Dolby Laboratories Licensing Corporation
    Inventors: Guan-Ming Su, Sheng Qu, Samir N. Hulyalkar, Tao Chen, Walter C. Gish, Hubert Koepfer
  • Patent number: 9924172
    Abstract: The quantization parameter QP is well-known in digital video compression as an indication of picture quality. Digital symbols representing a moving image are quantized with a quantizing step that is a function QSN of the quantization parameter QP, which function QSN has been normalized to the most significant bit of the bit depth of the digital symbols. As a result, the effect of a given QP is essentially independent of bit depth a particular QP value has a standard effect on image quality, regardless of bit depth. The invention is useful, for example, in encoding and decoding at different bit depths, to generate compatible, bitstreams having different bit depths, and to allow different bit depths for different components of a video signal by compressing each with the same fidelity (i.e., the same QP).
    Type: Grant
    Filed: June 16, 2017
    Date of Patent: March 20, 2018
    Assignee: Dolby Laboratories Licensing Corporation
    Inventors: Walter C. Gish, Christopher J. Vogt
  • Patent number: D813205
    Type: Grant
    Filed: December 16, 2016
    Date of Patent: March 20, 2018
    Assignee: Dolby Laboratories Licensing Corporation
    Inventors: Nils Jacob Palmborg, Andrew Everett McIntyre
  • Patent number: D813848
    Type: Grant
    Filed: June 27, 2016
    Date of Patent: March 27, 2018
    Assignee: Dolby Laboratories Licensing Corporation
    Inventor: Nils Jacob Palmborg