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公开(公告)号：US20180295459A1
公开(公告)日：2018-10-11
申请号：US16009154
申请日：2018-06-14
Applicant: DOLBY LABORATORIES LICENSING CORPORATION
Inventor： Richard J. CARTWRIGHT , David S. MCGRATH , Glenn N. DICKINS
CPC classification number: H04S1/005 , H04M3/568 , H04S7/30 , H04S7/304 , H04S2400/01 , H04S2400/03 , H04S2400/11 , H04S2420/01 , H04S2420/11
Abstract: A computer implemented system for rendering captured audio soundfields to a listener comprises apparatus to deliver the audio soundfields to the listener. The delivery apparatus delivers the audio soundfields to the listener with first and second audio elements perceived by the listener as emanating from first and second virtual source locations, respectively, and with the first audio element and/or the second audio element delivered to the listener from a third virtual source location. The first virtual source location and the second virtual source location are perceived by the listener as being located to the front of the listener, and the third virtual source location is located to the rear or the side of the listener.
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公开(公告)号：US20160150347A1
公开(公告)日：2016-05-26
申请号：US14899481
申请日：2014-06-17
Applicant: DOLBY LABORATORIES LICENSING CORPORATION
Inventor： David Matthew FISCHER , Timothy James EGGERDING , Eugene Edward RADZIK , Adam Christopher NOEL , David S. MCGRATH
CPC classification number: H04S7/308 , H03G11/008 , H04R3/04 , H04R3/12 , H04R3/14 , H04S3/008 , H04S5/00 , H04S7/30 , H04S2400/03 , H04S2400/07 , H04S2400/11
Abstract: Improved methods and devices for processing low-frequency audio data are provided. A bass extraction process may involve applying low-pass filters to received audio object signals, to produce extracted low-frequency audio signals. The bass extraction process may be performed prior to a process of rendering audio objects into speaker feed signals. A bass management process may involve routing the extracted low-frequency audio signals to the one or more speakers capable of reproducing low-frequency audio signals.
Abstract translation: 提供了改进的处理低频音频数据的方法和设备。 低音提取处理可以包括对接收的音频对象信号应用低通滤波器，以产生提取的低频音频信号。 可以在将音频对象呈现为扬声器馈送信号的处理之前执行低音提取处理。 低音管理过程可以包括将所提取的低频音频信号路由到能够再现低频音频信号的一个或多个扬声器。
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公开(公告)号：US20240331708A1
公开(公告)日：2024-10-03
申请号：US18658853
申请日：2024-05-08
Inventor： Stefan BRUHN , Michael ECKERT , Juan Felix TORRES , Stefanie BROWN , David S. MCGRATH
IPC: G10L19/008 , H04S3/00
CPC classification number: G10L19/008 , H04S3/008 , H04S2400/01
Abstract: The disclosed embodiments enable converting audio signals captured in various formats by various capture devices into a limited number of formats that can be processed by an audio codec (e.g., an Immersive Voice and Audio Services (IVAS) codec). In an embodiment, a simplification unit of the audio device receives an audio signal captured by one or more audio capture devices coupled to the audio device. The simplification unit determines whether the audio signal is in a format that is supported/not supported by an encoding unit of the audio device. Based on the determining, the simplification unit, converts the audio signal into a format that is supported by the encoding unit. In an embodiment, if the simplification unit determines that the audio signal is in a spatial format, the simplification unit can convert the audio signal into a spatial “mezzanine” format supported by the encoding.
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公开(公告)号：US20240151799A1
公开(公告)日：2024-05-09
申请号：US18550917
申请日：2022-04-19
Applicant: Dolby Laboratories Licensing Corporation
Inventor： David S. MCGRATH
IPC: G01R35/00 , G01C25/00 , G01R33/02 , G06F3/01 , G06F3/0346
CPC classification number: G01R35/005 , G01C25/005 , G01R33/0206 , G06F3/012 , G06F3/0346
Abstract: A method for performing calibration of magnetometers is provided. In some embodiments, the method involves obtaining a sequence of gyroscope measurements from one or more gyroscopes and a sequence of magnetometer measurements from one or more magnetometers. In some embodiments, the method involves determining a sequence of angular velocity estimates based on the sequence of gyroscope measurements. In some embodiments, the method involves determining a first estimate of a derivative of an external magnetic field based on the sequence of magnetometer measurements. In some embodiments, the method involves determining a second estimate of the derivative of the external magnetic field based on the sequence of angular velocity estimates. In some embodiments, the method involves identifying magnetometer calibration constants based on a difference between the first estimate of the derivative and the second estimate of the derivative.
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公开(公告)号：US20240015434A1
公开(公告)日：2024-01-11
申请号：US18352197
申请日：2023-07-13
Applicant: DOLBY LABORATORIES LICENSING CORPORATION
Inventor： David S. MCGRATH
CPC classification number: H04R3/005 , H04R1/406 , H04R5/04 , H04R2499/11
Abstract: Disclosed are methods and systems which convert a multi-microphone input signal to a multichannel output signal making use of a time- and frequency-varying matrix. For each time and frequency tile, the matrix is derived as a function of a dominant direction of arrival and a steering strength parameter. Likewise, the dominant direction and steering strength parameter are derived from characteristics of the multi-microphone signals, where those characteristics include values representative of the inter-channel amplitude and group-delay differences.
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Patent Agency Ranking
公开(公告)号：US20220231669A1
公开(公告)日：2022-07-21
申请号：US17617262
申请日：2020-06-25
Applicant: Dolby Laboratories Licensing Corporation
Inventor： David S. MCGRATH
IPC: H03H17/02 , G10L19/008
Abstract: A filterbank, suitable for modifying audio signals with dynamic gains in each band, is constructed so that the perceived latency is small, while a larger group delay is applied at low frequencies to enable higher frequency resolution in the lower frequency bands. The higher group delay at low frequencies is achieved by inserting an all-pass filter into the reconstructed filter response.
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公开(公告)号：US20210166708A1
公开(公告)日：2021-06-03
申请号：US17251913
申请日：2019-07-02
Inventor： David S. MCGRATH , Michael ECKERT , Heiko PURNHAGEN , Stefan BRUHN
IPC: G10L19/16 , G10L19/008 , G10L19/18
Abstract: The present document describes a method (700) for encoding a multi-channel input signal (201). The method (700) comprises determining (701) a plurality of downmix channel signals (203) from the multi-channel input signal (201) and performing (702) energy compaction of the plurality of downmix channel signals (203) to provide a plurality of compacted channel signals (404). Furthermore, the method (700) comprises determining (703) joint coding metadata (205) based on the plurality of compacted channel signals (404) and based on the multi-channel input signal (201), wherein the joint coding metadata (205) is such that it allows upmixing of the plurality of compacted channel signals (404) to an approximation of the multi-channel input signal (201). In addition, the method (700) comprises encoding (704) the plurality of compacted channel signals (404) and the joint coding metadata (205).
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公开(公告)号：US20210050022A1
公开(公告)日：2021-02-18
申请号：US16963489
申请日：2019-01-17
Inventor： Kristofer KJOERLING , David S. MCGRATH , Heiko PURNHAGEN , Mark R.P. THOMAS
IPC: G10L19/008
Abstract: The present document describes a method (400) for encoding a soundfield representation (SR) input signal (101, 301) describing a soundfield at a reference position, wherein the SR input signal (101, 301) comprises a plurality of channels for a plurality of different directivity patterns of the soundfield at the reference position. The method (400) comprises extracting (401) one or more audio objects (103, 303) from the SR input signal (101, 301). Furthermore, the method (400) comprises determining (402) a residual signal (102, 302) based on the SR input signal (101, 301) and based on the one or more audio objects (103, 303). The method (400) also comprises performing joint coding of the one or more audio objects (103, 303) and/or the residual signal (102, 302). In addition, the method (400) comprises generating (403) a bitstream (701) based on data generated in the context of joint coding of the one or more audio objects (103, 303) and/or the residual signal (102, 302).
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公开(公告)号：US20200169824A1
公开(公告)日：2020-05-28
申请号：US16611843
申请日：2018-05-02
Applicant: Dolby Laboratories Licensing Corporation
Inventor： David S. MCGRATH
IPC: H04S7/00 , G10L19/008 , H04S3/00 , H04S3/02
Abstract: Apparatus, computer readable media and methods for processing a multi-channel, spatial audio format input signal. For example, one such method comprises determining object location metadata based on the received spatial audio format input signal; and extracting object audio signals based on the received spatial audio format input signal, wherein the extracting object audio signals based on the received spatial audio format input signal includes determining object audio signals and residual audio signals.
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公开(公告)号：US20180254047A1
公开(公告)日：2018-09-06
申请号：US15902608
申请日：2018-02-22
Applicant: Dolby Laboratories Licensing Corporation
Inventor： Juan Felix TORRES , David S. MCGRATH , Michael William MASON
IPC: G10L19/008 , H04S5/00
CPC classification number: G10L19/008 , H04S5/005 , H04S2400/11
Abstract: Systems, methods, and computer program products of audio processing based on Adaptive Intermediate Spatial Format (AISF) are described. The AISF is an extension to ISF that allows spatial resolution around an ISF ring to be adjusted dynamically with respect to content of incoming audio objects. An AISF encoder device adaptively warps each ISF ring during ISF encoding to adjust angular distance between objects, resulting in increase in uniformity of energy distribution around the ISF ring. At an AISF decoder device, matrices that decode sound positions to the output speaker take into account the warping that was performed at the AISF encoder device to reproduce the true positions of sound sources.
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