公开(公告)号：US20230199427A1

公开(公告)日：2023-06-22

申请号：US18108663

申请日：2023-02-13

Applicant: DOLBY LABORATORIES LICENSING CORPORATION

Inventor： Kuan-Chieh YEN ,  Dirk Jeroen BREEBAART ,  Grant A. DAVIDSON ,  Rhonda WILSON ,  David M. COOPER ,  Zhiwei SHUANG

IPC: H04S7/00 ,  G10L19/008 ,  H04S3/00

CPC classification number: H04S7/306 ,  G10L19/008 ,  H04S3/004 ,  H04S2400/03 ,  H04S2420/01 ,  H04S2400/13 ,  H04S7/307

Abstract: In some embodiments, virtualization methods for generating a binaural signal in response to channels of a multi-channel audio signal, which apply a binaural room impulse response (BRIR) to each channel including by using at least one feedback delay network (FDN) to apply a common late reverberation to a downmix of the channels. In some embodiments, input signal channels are processed in a first processing path to apply to each channel a direct response and early reflection portion of a single-channel BRIR for the channel, and the downmix of the channels is processed in a second processing path including at least one FDN which applies the common late reverberation. Typically, the common late reverberation emulates collective macro attributes of late reverberation portions of at least some of the single-channel BRIRs. Other aspects are headphone virtualizers configured to perform any embodiment of the method.

公开(公告)号：US20220264244A1

公开(公告)日：2022-08-18

申请号：US17688744

申请日：2022-03-07

Applicant: Dolby Laboratories Licensing Corporation

Inventor： Grant A. DAVIDSON ,  Kuan-Chieh YEN ,  Dirk Jeroen BREEBAART

IPC: H04S7/00

Abstract: Methods and systems for designing binaural room impulse responses (BRIRs) for use in headphone virtualizers, and methods and systems for generating a binaural signal in response to a set of channels of a multi-channel audio signal, including by applying a BRIR to each channel of the set, thereby generating filtered signals, and combining the filtered signals to generate the binaural signal, where each BRIR has been designed in accordance with an embodiment of the design method. Other aspects are audio processing units configured to perform any embodiment of the inventive method. In accordance with some embodiments, BRIR design is formulated as a numerical optimization problem based on a simulation model (which generates candidate BRIRs) and at least one objective function (which evaluates each candidate BRIR), and includes identification of a best one of the candidate BRIRs as indicated by performance metrics determined for the candidate BRIRs by each objective function.

公开(公告)号：US20220182779A1

公开(公告)日：2022-06-09

申请号：US17560301

申请日：2021-12-23

Applicant: DOLBY LABORATORIES LICENSING CORPORATION

Inventor： Kuan-Chieh YEN ,  Dirk Jeroen BREEBAART ,  Grant A. DAVIDSON ,  Rhonda WILSON ,  David M. COOPER ,  Zhiwei SHUANG

IPC: H04S7/00 ,  H04S3/00 ,  G10L19/008

Abstract: In some embodiments, virtualization methods for generating a binaural signal in response to channels of a multi-channel audio signal, which apply a binaural room impulse response (BRIR) to each channel including by using at least one feedback delay network (FDN) to apply a common late reverberation to a downmix of the channels. In some embodiments, input signal channels are processed in a first processing path to apply to each channel a direct response and early reflection portion of a single-channel BRIR for the channel, and the downmix of the channels is processed in a second processing path including at least one FDN which applies the common late reverberation. Typically, the common late reverberation emulates collective macro attributes of late reverberation portions of at least some of the single-channel BRIRs. Other aspects are headphone virtualizers configured to perform any embodiment of the method.

公开(公告)号：US20210227344A1

公开(公告)日：2021-07-22

申请号：US17090772

申请日：2020-11-05

Applicant: Dolby Laboratories Licensing Corporation

Inventor： Grant A. DAVIDSON ,  Kuan-Chieh YEN ,  Dirk Jeroen BREEBAART

IPC: H04S7/00

Abstract: Methods and systems for designing binaural room impulse responses (BRIRs) for use in headphone virtualizers, and methods and systems for generating a binaural signal in response to a set of channels of a multi-channel audio signal, including by applying a BRIR to each channel of the set, thereby generating filtered signals, and combining the filtered signals to generate the binaural signal, where each BRIR has been designed in accordance with an embodiment of the design method. Other aspects are audio processing units configured to perform any embodiment of the inventive method. In accordance with some embodiments, BRIR design is formulated as a numerical optimization problem based on a simulation model (which generates candidate BRIRs) and at least one objective function (which evaluates each candidate BRIR), and includes identification of a best one of the candidate BRIRs as indicated by performance metrics determined for the candidate BRIRs by each objective function.

公开(公告)号：US20210082444A1

公开(公告)日：2021-03-18

申请号：US17046284

申请日：2019-04-10

Applicant: Dolby Laboratories Licensing Corporation

Inventor： Roy M. FEJGIN ,  Grant A. DAVIDSON ,  Chih-Wei WU ,  Vivek KUMAR

IPC: G10L19/022 ,  G06F3/16 ,  G06N3/08 ,  G06N3/04

Abstract: Computer-implemented methods for training a neural network, as well as for implementing audio encoders and decoders via trained neural networks, are provided. The neural network may receive an input audio signal, generate an encoded audio signal and decode the encoded audio signal. A loss function generating module may receive the decoded audio signal and a ground truth audio signal, and may generate a loss function value corresponding to the decoded audio signal. Generating the loss function value may involve applying a psychoacoustic model. The neural network may be trained based on the loss function value. The training may involve updating at least one weight of the neural network.

公开(公告)号：US20190364379A1

公开(公告)日：2019-11-28

申请号：US16538671

申请日：2019-08-12

Applicant: Dolby Laboratories Licensing Corporation

Inventor： Grant A. DAVIDSON ,  Kuan-Chieh YEN ,  Dirk Jeroen BREEBAART

IPC: H04S7/00

Abstract: Methods and systems for designing binaural room impulse responses (BRIRs) for use in headphone virtualizers, and methods and systems for generating a binaural signal in response to a set of channels of a multi-channel audio signal, including by applying a BRIR to each channel of the set, thereby generating filtered signals, and combining the filtered signals to generate the binaural signal, where each BRIR has been designed in accordance with an embodiment of the design method. Other aspects are audio processing units configured to perform any embodiment of the inventive method. In accordance with some embodiments, BRIR design is formulated as a numerical optimization problem based on a simulation model (which generates candidate BRIRs) and at least one objective function (which evaluates each candidate BRIR), and includes identification of a best one of the candidate BRIRs as indicated by performance metrics determined for the candidate BRIRs by each objective function.

公开(公告)号：US20190342685A1

公开(公告)日：2019-11-07

申请号：US16510849

申请日：2019-07-12

Applicant: Dolby Laboratories Licensing Corporation

Inventor： Louis D. FIELDER ,  Zhiwei SHUANG ,  Grant A. DAVIDSON ,  Xiguang ZHENG ,  Mark S. VINTON

IPC: H04S3/00 ,  H04S7/00 ,  H04S5/00 ,  G10K15/08

Abstract: The present disclosure relates to reverberation generation for headphone virtualization. A method of generating one or more components of a binaural room impulse response (BRIR) for headphone virtualization is described. In the method, directionally-controlled reflections are generated, wherein directionally-controlled reflections impart a desired perceptual cue to an audio input signal corresponding to a sound source location. Then at least the generated reflections are combined to obtain the one or more components of the BRIR. Corresponding system and computer program products are described as well.

公开(公告)号：US20150380000A1

公开(公告)日：2015-12-31

申请号：US14766371

申请日：2014-01-22

Applicant: DOLBY LABORATORIES LICENSING CORPORATION

Inventor： Vinay MELKOTE ,  Kuan-Chieh YEN ,  Grant A. DAVIDSON ,  Matthew FELLERS ,  Mark S. VINTON ,  Vivek KUMAR

IPC: G10L19/008 ,  G10L19/06 ,  H04S3/00 ,  G10L25/06

CPC classification number: G10L19/008 ,  G10L19/02 ,  G10L19/06 ,  G10L25/06 ,  H04S3/008 ,  H04S5/00

Abstract: Audio processing methods may involve receiving audio data corresponding to a plurality of audio channels. The audio data may include a frequency domain representation corresponding to filterbank coefficients of an audio encoding or processing system. A decorrelation process may be performed with the same filterbank coefficients used by the audio encoding or processing system. The decorrelation process may be performed without converting coefficients of the frequency domain representation to another frequency domain or time domain representation. The decorrelation process may involve selective or signal-adaptive decorrelation of specific channels and/or specific frequency bands. The decorrelation process may involve applying a decorrelation filter to a portion of the received audio data to produce filtered audio data. The decorrelation process may involve using a non-hierarchal mixer to combine a direct portion of the received audio data with the filtered audio data according to spatial parameters.

Abstract translation: 音频处理方法可以涉及接收对应于多个音频频道的音频数据。 音频数据可以包括对应于音频编码或处理系统的滤波器组系数的频域表示。 解相关处理可以用音频编码或处理系统使用的相同的滤波器组系数执行。 可以在不将频域表示的系数转换到另一频域或时域表示的情况下执行去相关处理。 解相关过程可以涉及特定信道和/或特定频带的选择性或信号自适应去相关。 解相关过程可以包括将去相关滤波器应用于所接收的音频数据的一部分以产生滤波后的音频数据。 去相关处理可以包括使用非层级混合器来根据空间参数将接收的音频数据的直接部分与经滤波的音频数据组合。