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公开(公告)号：US20170179903A1
公开(公告)日：2017-06-22
申请号：US15447493
申请日：2017-03-02
Applicant: Dolby Laboratories Licensing Corporation
Inventor： Brett G. Crockett , Alan J. Seefeldt
IPC: H03G3/30 , G10L21/038 , G10L25/21 , H04R3/04
CPC classification number: H03G3/3005 , G10L21/038 , G10L25/21 , H03G1/00 , H03G3/3089 , H03G7/007 , H03G9/005 , H04R3/04 , H04R2430/03
Abstract: In some embodiments, a method for processing an audio signal in an audio processing apparatus is disclosed. The method includes receiving an audio signal and a parameter, the parameter indicating a location of an auditory event boundary. An audio portion between consecutive auditory event boundaries constitutes an auditory event. The method further includes applying a modification to the audio signal based in part on an occurrence of the auditory event. The parameter may be generated by monitoring a characteristic of the audio signal and identifying a change in the characteristic.
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公开(公告)号：US09648440B2
公开(公告)日：2017-05-09
申请号：US14759182
申请日：2014-01-07
Applicant: DOLBY LABORATORIES LICENSING CORPORATION
Inventor： Brett G. Crockett , Christophe Chabanne , Mark Tuffy , Alan J. Seefeldt , C. Phillip Brown , Patrick Turnmire
CPC classification number: H04S7/307 , H04R1/02 , H04R1/26 , H04R3/04 , H04R3/12 , H04R3/14 , H04R5/02 , H04R2205/024
Abstract: Embodiments are directed to speakers and circuits that reflect sound off a ceiling to a listening location at a distance from a speaker. The reflected sound provides height cues to reproduce audio objects that have overhead audio components. The speaker comprises upward firing drivers to reflect sound off of the upper surface and represents a virtual height speaker. A virtual height filter based on a directional hearing model is applied to the upward-firing driver signal to improve the perception of height for audio signals transmitted by the virtual height speaker to provide optimum reproduction of the overhead reflected sound. The virtual height filter may be incorporated as part of a crossover circuit that separates the full band and sends high frequency sound to the upward-firing driver.
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公开(公告)号：US09626149B2
公开(公告)日：2017-04-18
申请号：US15098530
申请日：2016-04-14
Inventor： Jeroen Koppens , Jeffrey Riedmiller , Kristofer Kjoerling , Alexander Groeschel , Holger Hoerich , Alan J. Seefeldt
IPC: H03G7/00 , G06F3/16 , H03G9/00 , G10L19/16 , H03G3/30 , H03G9/12 , H04S1/00 , H04S7/00 , G10L21/0324
CPC classification number: G06F3/165 , G10L19/167 , G10L21/0324 , H03G3/3005 , H03G3/3089 , H03G7/002 , H03G7/007 , H03G9/005 , H03G9/12 , H04S1/00 , H04S7/30 , H04S2400/13
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.
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公开(公告)号：US09622011B2
公开(公告)日：2017-04-11
申请号：US14422033
申请日：2013-08-20
Applicant: DOLBY LABORATORIES LICENSING CORPORATION
Inventor： Alan J. Seefeldt
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.
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公开(公告)号：US09584083B2
公开(公告)日：2017-02-28
申请号：US14230232
申请日：2014-03-31
Applicant: Dolby Laboratories Licensing Corporation
Inventor： Alan J. Seefeldt , Michael Smithers
CPC classification number: H03G3/20 , H03G3/10 , H03G9/005 , H03G9/025 , H03G9/18 , H04R5/04 , H04S2400/13
Abstract: Scaling, by a desired amount sm, the overall perceived loudness Lm of a multichannel audio signal, wherein perceived loudness is a nonlinear function of signal power P, by scaling the perceived loudness of each individual channel Lc by an amount substantially equal to the desired amount of scaling of the overall perceived loudness of all channels sm, subject to accuracy in calculations and the desired accuracy of the overall perceived loudness scaling sm. The perceived loudness of each individual channel may be scaled by changing the gain of each individual channel, wherein gain is a scaling of a channel's power. Optionally, in addition, the loudness scaling applied to each channel may be modified so as to reduce the difference between the actual overall loudness scaling and the desired amount of overall loudness scaling.
Abstract translation: 通过将每个单独信道Lc的感知响度缩放基本上等于所需量的量，将感知响度定为信号功率P的非线性函数，以期望量sm缩放多声道音频信号的整体感知响度Lm 在所有频道sm的整体感知响度的缩放，受到计算的准确性和整体感知响度缩放sm的期望精度。 可以通过改变每个单独信道的增益来缩放每个单独信道的感知响度，其中增益是信道功率的缩放。 可选地，另外，应用于每个通道的响度缩放可以被修改，以便减小实际的整体响度缩放与期望的总响度缩放量之间的差异。
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Patent Agency Ranking
56.发明申请Techniques for Distortion Reducing Multi-Band Compressor with Timbre Preservation 有权用于失真减少多音频压缩器与音色保存的技术公开(公告)号：US20150270819A1
公开(公告)日：2015-09-24
申请号：US14732271
申请日：2015-06-05
Applicant: Dolby Laboratories Licensing Corporation
Inventor： Alan J. Seefeldt
Abstract: Distortion reducing multi-band 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.
Abstract translation: 提供了具有音色保存功能的失真减少多频带压缩器。 通过根据频带的相应固定阈值以及至少部分地在该频带之外的音频信号电平和固定阈值来确定多个频带中的每一个中的时变阈值来实现音色保留。 如果特定频带由于高于或接近其固定阈值而接收到显着的增益减小，则一个或多个其它频带的时变阈值也被减小以接收一些增益减小。 在具体实施例中，可以根据每个频带中的音频输入信号的平均差及其相应的固定阈值来计算时变阈值。
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公开(公告)号：US12273702B2
公开(公告)日：2025-04-08
申请号：US18060232
申请日：2022-11-30
Applicant: Dolby Laboratories Licensing Corporation
Inventor： C. Phillip Brown , Joshua Brandon Lando , Mark F. Davis , Alan J. Seefeldt , David Matthew Cooper , Dirk Jeroen Breebaart , Rhonda Wilson
IPC: H04S7/00
Abstract: A system and method of modifying a binaural signal using headtracking information. The system calculates a delay, a first filter response, and a second filter response, and applies these to the left and right components of the binaural signal according to the headtracking information. The system may also apply headtracking to parametric binaural signals. In this manner, headtracking may be applied to pre-rendered binaural audio.
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公开(公告)号：US12170875B2
公开(公告)日：2024-12-17
申请号：US17630917
申请日：2020-07-27
Inventor： Alan J. Seefeldt , Joshua B. Lando , Daniel Arteaga , Mark R. P Thomas , Glenn N. Dickins
Abstract: A multi-stream rendering system and method may render and play simultaneously a plurality of audio program streams over a plurality of arbitrarily placed loudspeakers. At least one of the program streams may be a spatial mix. The rendering of said spatial mix may be dynamically modified as a function of the simultaneous rendering of one or more additional program streams. The rendering of one or more additional program streams may be dynamically modified as a function of the simultaneous rendering of the spatial mix.
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公开(公告)号：US12022271B2
公开(公告)日：2024-06-25
申请号：US17630897
申请日：2020-07-27
Inventor： Alan J. Seefeldt , Joshua B. Lando , Daniel Arteaga
Abstract: Individual loudspeaker dynamics processing configuration data, for each of a plurality of loudspeakers of a listening environment, may be obtained. Listening environment dynamics processing configuration data may be determined, based on the individual loudspeaker dynamics processing configuration data. Dynamics processing may be performed on received audio data based on the listening environment dynamics processing configuration data, to generate processed audio data. The processed audio data may be rendered for reproduction via a set of loudspeakers that includes at least some of the plurality of loudspeakers, to produce rendered audio signals. The rendered audio signals may be provided to, and reproduced by, the set of loudspeakers.
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公开(公告)号：US11842122B2
公开(公告)日：2023-12-12
申请号：US17898358
申请日：2022-08-29
Inventor： Jeroen Koppens , Jeffrey Riedmiller , Kristofer Kjoerling , Alexander Stahlmann , Holger Hoerich , Alan J. Seefeldt
IPC: G06F3/16 , G10L19/16 , H03G7/00 , H03G9/00 , H03G9/02 , H04S7/00 , H03G9/18 , H03G3/30 , H03G9/12 , H04S1/00 , G10L21/0324
CPC classification number: G06F3/165 , G10L19/167 , G10L21/0324 , H03G3/3005 , H03G3/3089 , H03G7/002 , H03G7/007 , H03G9/005 , H03G9/025 , H03G9/12 , H03G9/18 , H04S1/00 , H04S7/30 , H04S2400/13
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.
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