公开(公告)号：US09628933B2

公开(公告)日：2017-04-18

申请号：US14906255

申请日：2014-07-18

Applicant: Dolby Laboratories Licensing Corporation

Inventor： Johannes Boehm

IPC: H04S3/02 ,  H04S7/00

CPC classification number: H04S3/02 ,  H04S7/301 ,  H04S7/308 ,  H04S2400/03 ,  H04S2400/15

Abstract: Multi-channel audio content is mixed for a particular loudspeaker setup. However, a consumer's audio setup is very likely to use a different placement of speakers. The present invention provides a method of rendering multi-channel audio that assures replay of the spatial signal components with equal loudness of the signal. A method for obtaining an energy preserving mixing matrix (G) for mixing L1 input audio channels to L2 output channels comprises steps of obtaining (s711) a first mixing matrix G, performing (s712) a singular value decomposition on the first mixing matrix Ĝ to obtain a singularity matrix S, processing (s713) the singularity matrix S to obtain a processed singularity matrix Ŝ, determining (s715) a scaling factor a, and calculating (s716) an improved mixing matrix G according to G=a U Ŝ VT. The perceived sound, loudness, timbre and spatial impression of multi-channel audio replayed on an arbitrary loudspeaker setup practically equals that of the original speaker setup.

公开(公告)号：US20160337778A1

公开(公告)日：2016-11-17

申请号：US15220766

申请日：2016-07-27

Applicant: DOLBY LABORATORIES LICENSING CORPORATION

Inventor： Peter Jax ,  Johannes Boehm ,  William Redmann

IPC: H04S7/00 ,  G10L19/008

CPC classification number: H04S7/302 ,  G10L19/008 ,  H04R5/00 ,  H04S7/305 ,  H04S2420/11

Abstract: A method for generating loudspeaker signals associated with a target screen size is disclosed. The method includes receiving a bit stream containing encoded higher order ambisonics signals, the encoded higher order ambisonics signals describing a sound field associated with a production screen size. The method further includes decoding the encoded higher order ambisonics signals to obtain a first set of decoded higher order ambisonics signals representing dominant components of the sound field and a second set of decoded higher order ambisonics signals representing ambient components of the sound field. The method also includes combining the first set of decoded higher order ambisonics signals and the second set of decoded higher order ambisonics signals to produce a combined set of decoded higher order ambisonics signals.

Abstract translation: 公开了一种用于产生与目标屏幕尺寸相关联的扬声器信号的方法。 所述方法包括接收包含编码的高阶态态信号的比特流，所述编码的高阶有向信号描述与生产屏幕尺寸相关联的声场。 该方法还包括解码编码的较高阶态态信号以获得表示声场的主要分量的第一组解码高阶态态信号和表示声场环境分量的第二组经解码的较高阶态态信号。 该方法还包括组合第一组解码的较高阶态态信号和第二组解码的高阶核心信号，以产生经解码的较高阶对准信号的组合集合。

公开(公告)号：US20160337775A1

公开(公告)日：2016-11-17

申请号：US15221354

申请日：2016-07-27

Applicant: DOLBY LABORATORIES LICENSING CORPORATION

Inventor： Alexander Krüger ,  Sven Kordon ,  Johannes Boehm ,  Johann-Markus Batke

IPC: H04S3/00 ,  G10L19/20 ,  G10L19/008

CPC classification number: H04S3/008 ,  G10L19/008 ,  G10L19/20 ,  H04H20/89 ,  H04S3/02 ,  H04S2420/11

Abstract: A method and apparatus for decompressing a Higher Order Ambisonics (HOA) signal representation is disclosed. The apparatus includes an input interface that receives an encoded directional signal and an encoded ambient signal and an audio decoder that perceptually decodes the encoded directional signal and encoded ambient signal to produce a decoded directional signal and a decoded ambient signal, respectively. The apparatus further includes an extractor for obtaining side information related to the directional signal and an inverse transformer for converting the decoded ambient signal from a spatial domain to an HOA domain representation of the ambient signal. The apparatus also includes a synthesizer for recomposing a Higher Order Ambisonics (HOA) signal from the HOA domain representation of the ambient signal and the decoded directional signal. The side information includes a direction of the directional signal selected from a set of uniformly spaced directions.

Abstract translation: 公开了一种用于解压缩高阶Ambisonics（HOA）信号表示的方法和装置。 该装置包括输入接口，其接收编码的定向信号和经编码的环境信号，以及音频解码器，其分别感知地解码编码的方向信号和编码的环境信号以产生解码的定向信号和解码的环境信号。 该装置还包括一个提取器，用于获取与定向信号有关的侧面信息;以及一个逆变换器，用于将解码的环境信号从空间域转换为环境信号的HOA域表示。 该装置还包括合成器，用于从环境信号的HOA域表示和解码的定向信号重构高阶环境（HOA）信号。 侧信息包括从一组均匀间隔的方向选择的方向信号的方向。

公开(公告)号：US09460728B2

公开(公告)日：2016-10-04

申请号：US14415571

申请日：2013-07-16

Applicant: Dolby Laboratories Licensing Corporation

Inventor： Johannes Boehm ,  Sven Kordon ,  Alexander Krueger ,  Peter Jax

IPC: G10L19/012 ,  G10L19/008 ,  H04S3/02

CPC classification number: G10L19/012 ,  G10L19/008 ,  G10L19/0212 ,  G10L19/038 ,  H04S3/02 ,  H04S2420/11

Abstract: A method for encoding multi-channel HOA audio signals for noise reduction comprises steps of decorrelating the channels using an inverse adaptive DSHT, the inverse adaptive DSHT comprising a rotation operation and an inverse DSHT, with the rotation operation rotating the spatial sampling grid of the iDSHT, perceptually encoding each of the decorrelated channels, encoding rotation information, the rotation information comprising parameters defining said rotation operation, and transmitting or storing the perceptually encoded audio channels and the encoded rotation information.

Abstract translation: 用于编码用于降噪的多声道HOA音频信号的方法包括以下步骤：使用逆自适应DSHT去除相关信道的步骤，逆自适应DSHT包括旋转操作和反向DSHT，旋转操作旋转iDSHT的空间采样网格 感知地编码每个解相关通道，编码旋转信息，旋转信息包括定义所述旋转操作的参数，以及发送或存储感知编码的音频通道和编码旋转信息。

公开(公告)号：US12273696B2

公开(公告)日：2025-04-08

申请号：US18505494

申请日：2023-11-09

Applicant: Dolby Laboratories Licensing Corporation

Inventor： Johannes Boehm ,  Florian Keiler

IPC: H04S3/00 ,  G10L19/008 ,  H04S3/02

Abstract: A method for performing DRC on a HOA signal comprises transforming the HOA signal to the spatial domain, analyzing the transformed HOA signal, and obtaining, from results of said analyzing, gain factors that are usable for dynamic compression. The gain factors can be transmitted together with the HOA signal. When applying the DRC, the HOA signal is transformed to the spatial domain, the gain factors are extracted and multiplied with the transformed HOA signal in the spatial domain, wherein a gain compensated transformed HOA signal is obtained. The gain compensated transformed HOA signal is transformed back into the HOA domain, wherein a gain compensated HOA signal is obtained. The DRC may be applied in the QMF-filter bank domain.

公开(公告)号：US12108236B2

公开(公告)日：2024-10-01

申请号：US18359198

申请日：2023-07-26

Applicant: Dolby Laboratories Licensing Corporation

Inventor： Johannes Boehm ,  Florian Keiler

IPC: H04S7/00 ,  H04S3/00

CPC classification number: H04S7/30 ,  H04S3/008 ,  H04S2420/11

Abstract: The invention discloses rendering sound field signals, such as Higher-Order Ambisonics (HOA), for arbitrary loudspeaker setups, where the rendering results in highly improved localization properties and is energy preserving. This is obtained by rendering an audio sound field representation for arbitrary spatial loudspeaker setups and/or by a a decoder that decodes based on a decode matrix (D). The decode matrix (D) is based on smoothing and scaling of a first decode matrix {circumflex over (D)} with smoothing coefficients. The first decode matrix {circumflex over (D)} is based on a mix matrix G and a mode matrix {tilde over (ψ)}, where the mix matrix G was determined based on L speakers and positions of a spherical modelling grid related to a HOA order N, and the mode matrix {tilde over (ψ)} was determined based on the spherical modelling grid and the HOA order N.

公开(公告)号：US20240056755A1

公开(公告)日：2024-02-15

申请号：US18457030

申请日：2023-08-28

Applicant: Dolby Laboratories Licensing Corporation

Inventor： Florian KEILER ,  Johannes Boehm

IPC: H04S3/02 ,  H04S7/00

CPC classification number: H04S3/02 ,  H04S7/308 ,  H04S2420/11 ,  H04S2400/11 ,  H04S2420/07

Abstract: Improved methods and/or apparatus for decoding an encoded audio signal in soundfield format for L loudspeakers. The method and/or apparatus can render an Ambisonics format audio signal to 2D loudspeaker setup(s) based on a rendering matrix. The rendering matrix has elements based on loudspeaker positions and wherein the rendering matrix is determined based on weighting at least an element of a first matrix with a weighting factor




ℊ
=


1

L


.





The first matrix is determined based on positions of the L loudspeakers and at least a virtual position of at least a virtual loudspeaker that is added to the positions of the L loudspeakers.

公开(公告)号：US11838738B2

公开(公告)日：2023-12-05

申请号：US17144325

申请日：2021-01-08

Applicant: Dolby Laboratories Licensing Corporation

Inventor： Johannes Boehm ,  Florian Keiler

IPC: H04S3/00 ,  G10L19/008 ,  H04S3/02

CPC classification number: H04S3/008 ,  G10L19/008 ,  H04S3/02 ,  H04S2420/01 ,  H04S2420/11

Abstract: A method for performing DRC on a HOA signal comprises transforming the HOA signal to the spatial domain, analyzing the transformed HOA signal, and obtaining, from results of said analyzing, gain factors that are usable for dynamic compression. The gain factors can be transmitted together with the HOA signal. When applying the DRC, the HOA signal is transformed to the spatial domain, the gain factors are extracted and multiplied with the transformed HOA signal in the spatial domain, wherein a gain compensated transformed HOA signal is obtained. The gain compensated transformed HOA signal is transformed back into the HOA domain, wherein a gain compensated HOA signal is obtained. The DRC may be applied in the QMF-filter bank domain.

公开(公告)号：US11770667B2

公开(公告)日：2023-09-26

申请号：US17893729

申请日：2022-08-23

Applicant: Dolby Laboratories Licensing Corporation

Inventor： Florian Keiler ,  Johannes Boehm

IPC: H04S3/02 ,  H04R5/02 ,  H04S5/02 ,  H04S7/00

CPC classification number: H04S3/02 ,  H04S7/308 ,  H04S2400/11 ,  H04S2420/07 ,  H04S2420/11

Abstract: Improved methods and/or apparatus for decoding an encoded audio signal in soundfield format for L loudspeakers. The method and/or apparatus can render an Ambisonics format audio signal to 2D loudspeaker setup(s) based on a rendering matrix. The rendering matrix has elements based on loudspeaker positions and wherein the rendering matrix is determined based on weighting at least an element of a first matrix with a weighting factor




g
=


1

L


.





The first matrix is determined based on positions of the L loudspeakers and at least a virtual position of at least a virtual loudspeaker that is added to the positions of the L loudspeakers.

公开(公告)号：US11750996B2

公开(公告)日：2023-09-05

申请号：US17893753

申请日：2022-08-23

Applicant: Dolby Laboratories Licensing Corporation

Inventor： Florian Keiler ,  Johannes Boehm

IPC: H04S3/02 ,  H04R5/02 ,  H04R5/00 ,  H04S5/02 ,  H04S7/00

CPC classification number: H04S3/02 ,  H04S7/308 ,  H04S2400/11 ,  H04S2420/07 ,  H04S2420/11

Abstract: Improved methods and/or apparatus for decoding an encoded audio signal in soundfield format for L loudspeakers. The method and/or apparatus can render an Ambisonics format audio signal to 2D loudspeaker setup(s) based on a rendering matrix. The rendering matrix has elements based on loudspeaker positions and wherein the rendering matrix is determined based on weighting at least an element of a first matrix with a weighting factor




g
=


1

L


.





The first matrix is determined based on positions of the L loudspeakers and at least a virtual position of at least a virtual loudspeaker that is added to the positions of the L loudspeakers.