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：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.

公开(公告)号：US10382880B2

公开(公告)日：2019-08-13

申请号：US15109557

申请日：2014-12-23

Applicant: DOLBY LABORATORIES LICENSING CORPORATION

Inventor： Grant A. Davidson ,  Kuan-Chieh Yen ,  Dirk Jeroen Breebaart

IPC: H04R5/00 ,  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：US10382875B2

公开(公告)日：2019-08-13

申请号：US16163863

申请日：2018-10-18

Applicant: Dolby Laboratories Licensing Corporation

Inventor： Louis D. Fielder ,  Zhiwei Shuang ,  Grant A. Davidson ,  Xiguang Zheng ,  Mark S. Vinton

IPC: H04S3/00 ,  H04S5/00 ,  H04S7/00 ,  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：US09830917B2

公开(公告)日：2017-11-28

申请号：US14766957

申请日：2014-01-22

Applicant: Dolby Laboratories Licensing Corporation

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

IPC: G10L19/008 ,  G10H7/00 ,  H04S5/00

CPC classification number: G10L19/008 ,  G10H7/008 ,  G10H2250/225 ,  H04S5/00 ,  H04S2400/03 ,  H04S2420/07

Abstract: Some audio processing methods may involve receiving audio data corresponding to a plurality of audio channels and determining audio characteristics of the audio data, which may include transient information. An amount of decorrelation for the audio data may be based, at least in part, on the audio characteristics. If a definite transient event is determined, a decorrelation process may be temporarily halted or slowed. Determining transient information may involve evaluating the likelihood and/or the severity of a transient event. In some implementations, determining transient information may involve evaluating a temporal power variation in the audio data. Explicit transient information may or may not be received with the audio data, depending on the implementation. Explicit transient information may include a transient control value corresponding to a definite transient event, a definite non-transient event or an intermediate transient control value.

公开(公告)号：US09275649B2

公开(公告)日：2016-03-01

申请号：US14325130

申请日：2014-07-07

Applicant: DOLBY LABORATORIES LICENSING CORPORATION ,  DOLBY INTERNATIONAL AB

Inventor： Arijit Biswas ,  Vinay Melkote ,  Michael Schug ,  Grant A. Davidson ,  Mark S. Vinton

IPC: G10L19/00 ,  G10L19/028 ,  G10L19/032 ,  G10L19/26 ,  G10L19/02

CPC classification number: G10L19/028 ,  G10L19/0204 ,  G10L19/032 ,  G10L19/265

Abstract: A method for determining mantissa bit allocation of audio data values of frequency domain audio data to be encoded. The allocation method includes a step of determining masking values for the audio data values, including by performing adaptive low frequency compensation on the audio data of each frequency band of a set of low frequency bands of the audio data. The adaptive low frequency compensation includes steps of: performing tonality detection on the audio data to generate compensation control data indicative of whether each frequency band in the set of low frequency bands has prominent tonal content; and performing low frequency compensation on the audio data in each frequency band in the set of low frequency bands having prominent tonal content as indicated by the compensation control data, but not performing low frequency compensation on the audio data in any other frequency band in the set of low frequency bands.

Abstract translation: 一种用于确定要编码的频域音频数据的音频数据值的尾数位分配的方法。 分配方法包括通过对音频数据的一组低频带的每个频带的音频数据执行自适应低频补偿来确定音频数据值的屏蔽值的步骤。 所述自适应低频补偿包括以下步骤：对所述音频数据执行音调检测，以产生指示所述一组低频带中的每个频带是否具有突出的音调内容的补偿控制数据; 对由该补偿控制数据所表示的具有突出色调内容的低频带组中的每个频带中的音频数据执行低频补偿，而不对该组中的任何其它频带中的音频数据执行低频补偿 的低频带。

公开(公告)号：US20250106576A1

公开(公告)日：2025-03-27

申请号：US18916598

申请日：2024-10-15

Applicant: Dolby Laboratories Licensing Corporation

Inventor： Louis D. Fielder ,  Zhiwei Shuang ,  Grant A. Davidson ,  Xiguang Zheng ,  Mark S. Vinton

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

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：US12089033B2

公开(公告)日：2024-09-10

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 ,  H04S7/307 ,  H04S2400/03 ,  H04S2400/13 ,  H04S2420/01

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：US12028701B2

公开(公告)日：2024-07-02

申请号：US18106261

申请日：2023-02-06

Applicant: Dolby Laboratories Licensing Corporation

Inventor： Grant A. Davidson ,  Kuan-Chieh Yen ,  Dirk Jeroen Breebaart

IPC: H04S7/00

CPC classification number: H04S7/304 ,  H04S7/306 ,  H04S2400/03 ,  H04S2420/01 ,  H04S2420/07

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.