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公开(公告)号：US20240334145A1
公开(公告)日：2024-10-03
申请号：US18623762
申请日：2024-04-01
Inventor： Antonio MATEOS SOLE , Nicolas R. TSINGOS
CPC classification number: H04S7/30 , H04S3/008 , H04S5/005 , H04S2400/01 , H04S2400/11 , H04S2400/13 , H04S2400/15
Abstract: Multiple virtual source locations may be defined for a volume within which audio objects can move. A set-up process for rendering audio data may involve receiving reproduction speaker location data and pre-computing gain values for each of the virtual sources according to the reproduction speaker location data and each virtual source location. The gain values may be stored and used during “run time,” during which audio reproduction data are rendered for the speakers of the reproduction environment. During run time, for each audio object, contributions from virtual source locations within an area or volume defined by the audio object position data and the audio object size data may be computed. A set of gain values for each output channel of the reproduction environment may be computed based, at least in part, on the computed contributions. Each output channel may correspond to at least one reproduction speaker of the reproduction environment.
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公开(公告)号：US12106762B2
公开(公告)日：2024-10-01
申请号：US18653851
申请日：2024-05-02
Applicant: DOLBY INTERNATIONAL AB
Inventor： Kristofer Kjoerling
IPC: G10L21/038 , G10L19/00 , G10L19/02
CPC classification number: G10L19/0017 , G10L19/0204 , G10L21/038
Abstract: The application relates to HFR (High Frequency Reconstruction/Regeneration) of audio signals. In particular, the application relates to a method and system for performing HFR of audio signals having large variations in energy level across the low frequency range which is used to reconstruct the high frequencies of the audio signal. A system configured to generate a plurality of high frequency subband signals covering a high frequency interval from a plurality of low frequency subband signals is described. The system comprises means for receiving the plurality of low frequency subband signals; means for receiving a set of target energies, each target energy covering a different target interval within the high frequency interval and being indicative of the desired energy of one or more high frequency subband signals lying within the target interval; means for generating the plurality of high frequency subband signals from the plurality of low frequency subband signals and from a plurality of spectral gain coefficients associated with the plurality of low frequency subband signals, respectively; and means for adjusting the energy of the plurality of high frequency subband signals using the set of target energies.
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公开(公告)号：US12106761B2
公开(公告)日：2024-10-01
申请号：US18653833
申请日：2024-05-02
Applicant: DOLBY INTERNATIONAL AB
Inventor： Kristofer Kjoerling
IPC: G10L21/038 , G10L19/00 , G10L19/02
CPC classification number: G10L19/0017 , G10L19/0204 , G10L21/038
Abstract: The application relates to HFR (High Frequency Reconstruction/Regeneration) of audio signals. In particular, the application relates to a method and system for performing HFR of audio signals having large variations in energy level across the low frequency range which is used to reconstruct the high frequencies of the audio signal. A system configured to generate a plurality of high frequency subband signals covering a high frequency interval from a plurality of low frequency subband signals is described. The system comprises means for receiving the plurality of low frequency subband signals; means for receiving a set of target energies, each target energy covering a different target interval within the high frequency interval and being indicative of the desired energy of one or more high frequency subband signals lying within the target interval; means for generating the plurality of high frequency subband signals from the plurality of low frequency subband signals and from a plurality of spectral gain coefficients associated with the plurality of low frequency subband signals, respectively; and means for adjusting the energy of the plurality of high frequency subband signals using the set of target energies.
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34.发明公开公开(公告)号：US20240312471A1
公开(公告)日：2024-09-19
申请号：US18677047
申请日：2024-05-29
Applicant: DOLBY INTERNATIONAL AB
Inventor： Lars Villemoes , Heiko Purnhagen , Per Ekstrand
IPC: G10L19/26 , G10L19/008 , G10L19/24
CPC classification number: G10L19/26 , G10L19/008 , G10L19/24
Abstract: A method for decoding an encoded audio bitstream is disclosed. The method includes receiving the encoded audio bitstream and decoding the audio data to generate a decoded lowband audio signal. The method further includes extracting high frequency reconstruction metadata and filtering the decoded lowband audio signal with an analysis filterbank to generate a filtered lowband audio signal. The method also includes extracting a flag indicating whether either spectral translation or harmonic transposition is to be performed on the audio data and regenerating a highband portion of the audio signal using the filtered lowband audio signal and the high frequency reconstruction metadata in accordance with the flag.
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公开(公告)号：US20240296850A1
公开(公告)日：2024-09-05
申请号：US18606908
申请日：2024-03-15
Applicant: DOLBY INTERNATIONAL AB
Inventor： Sven KORDON , Alexander KRUEGER
IPC: G10L19/008 , H04S3/00
CPC classification number: G10L19/008 , H04S3/008 , H04S2420/11
Abstract: The present document relates to a method of layered encoding of a compressed sound representation of a sound or sound field. The compressed sound representation comprises a basic compressed sound representation comprising a plurality of components, basic side information for decoding the basic compressed sound representation to a basic reconstructed sound representation of the sound or sound field, and enhancement side information including parameters for improving the basic reconstructed sound representation. The method comprises sub-dividing the plurality of components into a plurality of groups of components and assigning each of the plurality of groups to a respective one of a plurality of hierarchical layers, the number of groups corresponding to the number of layers, and the plurality of layers including a base layer and one or more hierarchical enhancement layers, adding the basic side information to the base layer, and determining a plurality of portions of enhancement side information from the enhancement side information and assigning each of the plurality of portions of enhancement side information to a respective one of the plurality of layers, wherein each portion of enhancement side information includes parameters for improving a reconstructed sound representation obtainable from data included in the respective layer and any layers lower than the respective layer. The document further relates to a method of decoding a compressed sound representation of a sound or sound field, wherein the compressed sound representation is encoded in a plurality of hierarchical layers that include a base layer and one or more hierarchical enhancement layers, as well as to an encoder and a decoder for layered coding of a compressed sound representation.
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Patent Agency Ranking
公开(公告)号：US20240294987A1
公开(公告)日：2024-09-05
申请号：US18637832
申请日：2024-04-17
Applicant: Dolby International AB
Inventor： Lars VILLEMOES , Per EKSTRAND
IPC: C12Q1/6883 , G10L19/02 , G10L19/022 , G10L19/26 , G10L21/038
CPC classification number: C12Q1/6883 , G10L19/0204 , G10L19/022 , G10L19/265 , G10L21/038 , C12Q2600/118 , C12Q2600/156
Abstract: The present invention relates to coding of audio signals, and in particular to high frequency reconstruction methods including a frequency domain harmonic transposer. A system and method for generating a high frequency component of a signal from a low frequency component of the signal is described. The system comprises an analysis filter bank (501) comprising an analysis transformation unit (601) having a frequency resolution of Δf; and an analysis window (611) having a duration of DA; the analysis filter bank (501) being configured to provide a set of analysis subband signals from the low frequency component of the signal; a nonlinear processing unit (502, 650) configured to determine a set of synthesis subband signals based on a portion of the set of analysis subband signals, wherein the portion of the set of analysis subband signals is phase shifted by a transposition order T; and a synthesis filter bank (504) comprising a synthesis transformation unit (602) having a frequency resolution of QΔf; and a synthesis window (612) having a duration of DS; the synthesis filter bank (504) being configured to generate the high frequency component of the signal from the set of synthesis subband signals; wherein Q is a frequency resolution factor with Q≥1 and smaller than the transposition order T; and wherein the value of the product of the frequency resolution Δf and the duration DA of the analysis filter bank is selected based on the frequency resolution factor Q.
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37.发明公开公开(公告)号：US20240282322A1
公开(公告)日：2024-08-22
申请号：US18592965
申请日：2024-03-01
Inventor： Sripal S. MEHTA , Thomas ZIEGLER , Stewart MURRIE
CPC classification number: G10L19/008 , G06F3/165 , G10L19/20 , H04S3/008 , H04S7/30 , G10L19/167 , H04S2400/01 , H04S2400/13 , H04S2400/15 , H04S2420/03
Abstract: Methods and audio processing units for generating an object based audio program including conditional rendering metadata corresponding to at least one object channel of the program, where the conditional rendering metadata is indicative of at least one rendering constraint, based on playback speaker array configuration, which applies to each corresponding object channel, and methods for rendering audio content determined by such a program, including by rendering content of at least one audio channel of the program in a manner compliant with each applicable rendering constraint in response to at least some of the conditional rendering metadata. Rendering of a selected mix of content of the program may provide an immersive experience.
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公开(公告)号：US12069464B2
公开(公告)日：2024-08-20
申请号：US17625720
申请日：2020-07-07
Inventor： Dirk Jeroen Breebaart , David Matthew Cooper , Giulio Cengarle , Brett G. Crockett , Rhonda J. Wilson
CPC classification number: H04S3/008 , H04R5/04 , H04S7/301 , H04S2400/01 , H04S2420/03
Abstract: A method for generating mastered audio content, the method comprising obtaining an input audio content comprising a number, M1, of audio signals, obtaining rendered presentation of the input audio content, the rendered presentation comprising a number, M2, of audio signals, obtaining a mastered presentation generated by mastering the rendered presentation, comparing the mastered presentation with the rendered presentation to determine one or more indications of differences between the mastered presentation and the rendered presentation, modifying one or more of the audio signals of the input audio content based on the indications of differences to generate the mastered audio content. With this approach, conventional, typically stereo, channel-based mastering tools can be used to provide a mastered version of any input audio content, including object-based immersive audio content.
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39.发明公开公开(公告)号：US20240249738A1
公开(公告)日：2024-07-25
申请号：US18620081
申请日：2024-03-28
Inventor： Jeffrey RIEDMILLER , Harald MUNDT , Michael SCHUG , Martin WOLTERS
CPC classification number: G10L19/22 , G10L19/02 , G10L19/0208 , G10L19/167 , G10L19/26 , H03G3/3089 , H03G3/32 , H03G7/007
Abstract: Many portable playback devices cannot decode and playback encoded audio content having wide bandwidth and wide dynamic range with consistent loudness and intelligibility unless the encoded audio content has been prepared specially for these devices. This problem can be overcome by including with the encoded content some metadata that specifies a suitable dynamic range compression profile by either absolute values or differential values relative to another known compression profile. A playback device may also adaptively apply gain and limiting to the playback audio. Implementations in encoders, in transcoders and in decoders are disclosed.
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公开(公告)号：US20240244210A1
公开(公告)日：2024-07-18
申请号：US18618697
申请日：2024-03-27
Applicant: DOLBY INTERNATIONAL AB
Inventor： Yeping Su , Christopher A. Segall
IPC: H04N19/13 , H03M7/30 , H03M7/40 , H03M7/42 , H04L45/745 , H04N19/15 , H04N19/176 , H04N19/46 , H04N19/52 , H04N19/61 , H04N19/70 , H04N19/91
CPC classification number: H04N19/13 , H03M7/4031 , H03M7/42 , H03M7/6076 , H04L45/745 , H04N19/15 , H04N19/176 , H04N19/46 , H04N19/52 , H04N19/61 , H04N19/70 , H04N19/91
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.
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