公开(公告)号：US11576004B2

公开(公告)日：2023-02-07

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：US09489956B2

公开(公告)日：2016-11-08

申请号：US14767565

申请日：2014-01-22

Applicant: Dolby Laboratories Licensing Corporation

Inventor： Matthew Fellers ,  Vinay Melkote ,  Kuan-Chieh Yen ,  Grant A. Davidson ,  Mark F. Davis

IPC: G10L19/008 ,  G10L19/02 ,  G10L19/012 ,  G10L25/06 ,  G10L25/18

CPC classification number: G10L19/008 ,  G10L19/012 ,  G10L19/0204 ,  G10L25/06 ,  G10L25/18

Abstract: Received audio data may include a first set of frequency coefficients and a second set of frequency coefficients. Spatial parameters for at least part of the second set of frequency coefficients may be estimated, based at least in part on the first set of frequency coefficients. The estimated spatial parameters may be applied to the second set of frequency coefficients to generate a modified second set of frequency coefficients. The first set of frequency coefficients may correspond to a first frequency range (for example, an individual channel frequency range) and the second set of frequency coefficients may correspond to a second frequency range (for example, a coupled channel frequency range). Combined frequency coefficients of a composite coupling channel may be based on frequency coefficients of two or more channels. Cross-correlation coefficients, between frequency coefficients of a first channel and the combined frequency coefficients, may be computed.

Abstract translation: 接收的音频数据可以包括第一组频率系数和第二组频率系数。 可以至少部分地基于第一组频率系数来估计第二组频率系数的至少一部分的空间参数。 估计的空间参数可以应用于第二组频率系数，以产生经修改的第二组频率系数。 第一组频率系数可以对应于第一频率范围（例如，单个信道频率范围），并且第二组频率系数可以对应于第二频率范围（例如，耦合的信道频率范围）。 复合耦合信道的组合频率系数可以基于两个或更多个信道的频率系数。 可以计算第一通道的频率系数与组合频率系数之间的互相关系数。

公开(公告)号：US10425763B2

公开(公告)日：2019-09-24

申请号：US15109541

申请日：2014-12-18

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 feed-back 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：US09830916B2

公开(公告)日：2017-11-28

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 ,  G10L19/02 ,  H04S3/00 ,  H04S5/00 ,  H04L19/00 ,  H04L25/06 ,  G10L19/06 ,  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.

公开(公告)号：US09754596B2

公开(公告)日：2017-09-05

申请号：US14767279

申请日：2014-01-22

Applicant: Dolby Laboratories Licensing Corporation

Inventor： Kuan-Chieh Yen ,  Vinay Melkote ,  Matthew Fellers ,  Grant A. Davidson

IPC: H04S5/00 ,  H04S3/00 ,  G10L19/008

CPC classification number: G10L19/008 ,  H04S3/008 ,  H04S5/00 ,  H04S2400/03 ,  H04S2420/03 ,  H04S2420/07

Abstract: Audio characteristics of audio data corresponding to a plurality of audio channels may be determined. The audio characteristics may include spatial parameter data. Decorrelation filtering processes for the audio data may be based, at least in part, on the audio characteristics. The decorrelation filtering processes may cause a specific inter-decorrelation signal coherence (“IDC”) between channel-specific decorrelation signals for at least one pair of channels. The channel-specific decorrelation signals may be received and/or determined. Inter-channel coherence (“ICC”) between a plurality of audio channel pairs may be controlled. Controlling ICC may involve at receiving an ICC value and/or determining an ICC value based, at least partially, on the spatial parameter data. A set of IDC values may be based, at least partially, on the set of ICC values. A set of channel-specific decorrelation signals, corresponding with the set of IDC values, may be synthesized by performing operations on the filtered audio data.

公开(公告)号：US11212638B2

公开(公告)日：2021-12-28

申请号：US17012076

申请日：2020-09-04

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

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：US10834519B2

公开(公告)日：2020-11-10

申请号：US16749494

申请日：2020-01-22

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：US10547963B2

公开(公告)日：2020-01-28

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：US11272311B2

公开(公告)日：2022-03-08

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：US10771914B2

公开(公告)日：2020-09-08

申请号：US16777599

申请日：2020-01-30

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

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.