公开(公告)号：US20170094440A1

公开(公告)日：2017-03-30

申请号：US15123934

申请日：2015-03-04

Applicant: Dolby Laboratories Licensing Corporation

Inventor： C. Phillip BROWN ,  Matthew FELLERS ,  Regunathan RADHAKRISHNAN

IPC: H04S7/00 ,  H04S1/00

CPC classification number: H04S7/304 ,  H04S1/007 ,  H04S7/30 ,  H04S2400/11 ,  H04S2420/01

Abstract: A method for creating a head-related impulse response (HRIR) for use in rendering audio for playback through headphones comprises receiving location parameters for a sound including azimuth, elevation, and range relative to a head of a listener, applying a spherical head model to the azimuth, elevation, and range input parameters to generate binaural HRIR values, computing a pinna model using the azimuth and elevation parameters to apply to the binaural HRIR values to pinna modeled HRIR values, computing a torso model using the azimuth and elevation parameters to apply to the pinna modeled HRIR values to generate pinna and torso modeled HRIR values, and computing a near-field model using the azimuth and range parameters to apply to the pinna and torso modeled HRIR values to generate pinna, torso and near-field modeled HRIR values.

公开(公告)号：US20160005406A1

公开(公告)日：2016-01-07

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: G10L19/008 ,  H04S3/00

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.

Abstract translation: 可以确定与多个音频通道对应的音频数据的音频特性。 音频特征可以包括空间参数数据。 音频数据的解相关滤波处理可以至少部分地基于音频特性。 去相关滤波处理可以在至少一对信道之间引起信道特定解相关信号之间的特定解相关信号相干性（“IDC”）。 信道特定的去相关信号可以被接收和/或确定。 可以控制多个音频通道对之间的通道间相干（“ICC”）。 控制ICC可以涉及至少部分地基于空间参数数据接收ICC值和/或确定ICC值。 一组IDC值可以至少部分地基于ICC值集合。 可以通过对经滤波的音频数据执行操作来合成与集合的IDC值相对应的一组通道特定的解相关信号。

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。

公开(公告)号：US20160005413A1

公开(公告)日：2016-01-07

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

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：US20150371646A1

公开(公告)日：2015-12-24

申请号：US14767867

申请日：2014-01-22

Applicant: Dolby Laboratories Licensing Corporation

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

IPC: G10L19/008 ,  G10L25/06 ,  G10L25/09 ,  H04S3/00

CPC classification number: G10L19/008 ,  G10H2250/061 ,  G10H2250/225 ,  G10H2250/575 ,  G10L25/06 ,  G10L25/09 ,  H04S3/008 ,  H04S5/00 ,  H04S2400/01 ,  H04S2400/03 ,  H04S2420/03 ,  H04S2420/07

Abstract: Decorrelation filter parameters for audio data may be based, at least in part, on audio characteristics such as tonality information and/or transient information. Determining the audio characteristics may involve receiving explicit audio characteristics with the audio data and/or determining audio characteristics based on one or more attributes of the audio data. The decorrelation filter parameters may include dithering parameters and/or randomly selected pole locations for at least one pole of an all-pass filter. The dithering parameters and/or pole locations may involve a maximum stride value for pole movement. In some examples, the maximum stride value may be substantially zero for highly tonal signals of the audio data. The dithering parameters and/or pole locations may be bounded by constraint areas within which pole movements are constrained. The constraint areas may or may not be fixed. In some implementations, different channels of the audio data may share the same constraint areas.

Abstract translation: 音频数据的解相关滤波器参数可以至少部分地基于诸如音调信息和/或瞬态信息的音频特性。 确定音频特征可以包括基于音频数据的一个或多个属性来接收具有音频数据的显式音频特征和/或确定音频特性。 去相关滤波器参数可以包括全通滤波器的至少一个极点的抖动参数和/或随机选择的极点位置。 抖动参数和/或极点位置可能涉及极运动的最大步幅值。 在一些示例中，对于音频数据的高音调信号，最大步幅值可以基本为零。 抖动参数和/或极点位置可以限制极限运动受限制的约束区域。 约束区域可以是或可以不是固定的。 在一些实现中，音频数据的不同频道可以共享相同的约束区域。