公开(公告)号：US20180308498A1

公开(公告)日：2018-10-25

申请号：US16019233

申请日：2018-06-26

Applicant: DOLBY LABORATORIES LICENSING CORPORATION

Inventor： Johann-Markus BATKE ,  Florian KEILER ,  Johannes BOEHM

IPC: G10L19/008 ,  H04S3/02 ,  H04S7/00

CPC classification number: G10L19/008 ,  H04S3/02 ,  H04S7/308 ,  H04S2400/13 ,  H04S2420/11

Abstract: Soundfield signals such as e.g. Ambisonics carry a representation of a desired sound field. The Ambisonics format is based on spherical harmonic decomposition of the soundfield, and Higher Order Ambisonics (HOA) uses spherical harmonics of at least 2nd order. However, commonly used loudspeaker setups are irregular and lead to problems in decoder design. A method for improved decoding an audio soundfield representation for audio playback comprises calculating a panning function (W) using a geometrical method based on the positions of a plurality of loudspeakers and a plurality of source directions, calculating a mode matrix (Ξ) from the loudspeaker positions, calculating a pseudo-inverse mode matrix (Ξ+) and decoding the audio soundfield representation. The decoding is based on a decode matrix (D) that is obtained from the panning function (W) and the pseudo-inverse mode matrix (Ξ+).

公开(公告)号：US20190139555A1

公开(公告)日：2019-05-09

申请号：US16189768

申请日：2018-11-13

Applicant: DOLBY LABORATORIES LICENSING CORPORATION

Inventor： Johann-Markus BATKE ,  Florian KEILER ,  Johannes BOEHM

IPC: G10L19/008 ,  H04S7/00 ,  H04S3/02

Abstract: Soundfield signals such as e.g. Ambisonics carry a representation of a desired sound field. The Ambisonics format is based on spherical harmonic decomposition of the soundfield, and Higher Order Ambisonics (HOA) uses spherical harmonics of at least 2nd order. However, commonly used loudspeaker setups are irregular and lead to problems in decoder design. A method for improved decoding an audio soundfield representation for audio playback comprises calculating a panning function (W) using a geometrical method based on the positions of a plurality of loudspeakers and a plurality of source directions, calculating a mode matrix (Ξ) from the loudspeaker positions, calculating a pseudo-inverse mode matrix (Ξ+) and decoding the audio soundfield representation. The decoding is based on a decode matrix (D) that is obtained from the panning function (W) and the pseudo-inverse mode matrix (Ξ+) .

公开(公告)号：US20220189492A1

公开(公告)日：2022-06-16

申请号：US17560223

申请日：2021-12-22

Applicant: DOLBY LABORATORIES LICENSING CORPORATION

Inventor： Johann-Markus BATKE ,  Florian KEILER ,  Johannes BOEHM

IPC: G10L19/008 ,  H04S3/02 ,  H04S7/00

Abstract: Soundfield signals such as e.g. Ambisonics carry a representation of a desired sound field. The Ambisonics format is based on spherical harmonic decomposition of the soundfield, and Higher Order Ambisonics (HOA) uses spherical harmonics of at least 2nd order. However, commonly used loudspeaker setups are irregular and lead to problems in decoder design. A method for improved decoding an audio soundfield representation for audio playback comprises calculating a panning function (W) using a geometrical method based on the positions of a plurality of loudspeakers and a plurality of source directions, calculating a mode matrix (Ξ) from the loudspeaker positions, calculating a pseudo-inverse mode matrix (Ξ+) and decoding the audio soundfield representation. The decoding is based on a decode matrix (D) that is obtained from the panning function (W) and the pseudo-inverse mode matrix (Ξ+).

公开(公告)号：US20170025127A1

公开(公告)日：2017-01-26

申请号：US15245061

申请日：2016-08-23

Applicant: DOLBY LABORATORIES LICENSING CORPORATION

Inventor： Johann-Markus BATKE ,  Florian KEILER ,  Johannes BOEHM

IPC: G10L19/008 ,  H04S7/00

CPC classification number: G10L19/008 ,  H04S3/02 ,  H04S7/308 ,  H04S2400/13 ,  H04S2420/11

Abstract: Soundfield signals such as e.g. Ambisonics carry a representation of a desired sound field. The Ambisonics format is based on spherical harmonic decomposition of the soundfield, and Higher Order Ambisonics (HOA) uses spherical harmonics of at least 2nd order. However, commonly used loudspeaker setups are irregular and lead to problems in decoder design. A method for improved decoding an audio soundfield representation for audio playback comprises calculating a panning function (W) using a geometrical method based on the positions of a plurality of loudspeakers and a plurality of source directions, calculating a mode matrix (Ξ) from the loudspeaker positions, calculating a pseudo-inverse mode matrix (Ξ+) and decoding the audio soundfield representation. The decoding is based on a decode matrix (D) that is obtained from the panning function (W) and the pseudo-inverse mode matrix (Ξ+).

Abstract translation: Soundfield信号，例如 Ambisonics携带所需声场的表示。 Ambisonics格式基于声场的球谐函数分解，而高阶Ambisonics（HOA）使用至少二阶的球谐函数。 然而，常用的扬声器设置是不规则的，并导致解码器设计中的问题。 一种用于改进对用于音频回放的音频声场表示进行解码的方法包括使用基于多个扬声器和多个源方向的位置的几何方法来计算摇摄功能（W），从扬声器计算模式矩阵（Ξ） 位置，计算伪逆模式矩阵（Ξ+）并解码音频声场表示。 解码基于从平移功能（W）和伪逆模式矩阵（Ξ+）获得的解码矩阵（D）。

公开(公告)号：US20240304195A1

公开(公告)日：2024-09-12

申请号：US18607321

申请日：2024-03-15

Applicant: Dolby Laboratories Licensing Corporation

Inventor： Johann-Markus BATKE ,  Florian KEILER ,  Johannes BOEHM

IPC: G10L19/008 ,  H04S3/02 ,  H04S7/00

CPC classification number: G10L19/008 ,  H04S3/02 ,  H04S7/308 ,  H04S2400/13 ,  H04S2420/11

Abstract: Soundfield signals such as e.g. Ambisonics carry a representation of a desired sound field. The Ambisonics format is based on spherical harmonic decomposition of the soundfield, and Higher Order Ambisonics (HOA) uses spherical harmonics of at least 2nd order. However, commonly used loudspeaker setups are irregular and lead to problems in decoder design. A method for improved decoding an audio soundfield representation for audio playback comprises calculating a panning function (W) using a geometrical method based on the positions of a plurality of loudspeakers and a plurality of source directions, calculating a mode matrix (Ξ) from the loudspeaker positions, calculating a pseudo-inverse mode matrix (Ξ+) and decoding the audio soundfield representation. The decoding is based on a decode matrix (D) that is obtained from the panning function (W) and the pseudo-inverse mode matrix (Ξ+).

公开(公告)号：US20200273470A1

公开(公告)日：2020-08-27

申请号：US16852459

申请日：2020-04-18

Applicant: DOLBY LABORATORIES LICENSING CORPORATION

Inventor： Johann-Markus BATKE ,  Florian KEILER ,  Johannes BOEHM

IPC: G10L19/008 ,  H04S3/02 ,  H04S7/00

Abstract: Soundfield signals such as e.g. Ambisonics carry a representation of a desired sound field. The Ambisonics format is based on spherical harmonic decomposition of the soundfield, and Higher Order Ambisonics (HOA) uses spherical harmonics of at least 2nd order. However, commonly used loudspeaker setups are irregular and lead to problems in decoder design. A method for improved decoding an audio soundfield representation for audio playback comprises calculating a panning function (W) using a geometrical method based on the positions of a plurality of loudspeakers and a plurality of source directions, calculating a mode matrix (Ξ) from the loudspeaker positions, calculating a pseudo-inverse mode matrix (Ξ+) and decoding the audio soundfield representation. The decoding is based on a decode matrix (D) that is obtained from the panning function (W) and the pseudo-inverse mode matrix (Ξ+).

公开(公告)号：US20170372709A1

公开(公告)日：2017-12-28

申请号：US15681793

申请日：2017-08-21

Applicant: DOLBY LABORATORIES LICENSING CORPORATION

Inventor： Johann-Markus BATKE ,  Florian KEILER ,  Johannes BOEHM

IPC: G10L19/008 ,  H04S3/02 ,  H04S7/00

CPC classification number: G10L19/008 ,  H04S3/02 ,  H04S7/308 ,  H04S2400/13 ,  H04S2420/11

Abstract: Soundfield signals such as e.g. Ambisonics carry a representation of a desired sound field. The Ambisonics format is based on spherical harmonic decomposition of the soundfield, and Higher Order Ambisonics (HOA) uses spherical harmonics of at least 2nd order. However, commonly used loudspeaker setups are irregular and lead to problems in decoder design. A method for improved decoding an audio soundfield representation for audio playback comprises calculating a panning function (W) using a geometrical method based on the positions of a plurality of loudspeakers and a plurality of source directions, calculating a mode matrix (Ξ) from the loudspeaker positions, calculating a pseudo-inverse mode matrix (Ξ+) and decoding the audio soundfield representation. The decoding is based on a decode matrix (D) that is obtained from the panning function (W) and the pseudo-inverse mode matrix (Ξ+).

公开(公告)号：US20240147173A1

公开(公告)日：2024-05-02

申请号：US18487280

申请日：2023-10-16

Applicant: Dolby Laboratories Licensing Corporation

Inventor： Alexander KRUEGER ,  Sven KORDON ,  Johannes BOEHM ,  Johann-Markus BATKE

IPC: H04S3/00 ,  G10L19/008 ,  G10L19/20 ,  H04H20/89

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

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.

公开(公告)号：US20190341062A1

公开(公告)日：2019-11-07

申请号：US16514446

申请日：2019-07-17

Applicant: DOLBY LABORATORIES LICENSING CORPORATION

Inventor： Johann-Markus BATKE ,  Florian KEILER ,  Johannes BOEHM

IPC: G10L19/008 ,  H04S7/00 ,  H04S3/02

Abstract: Soundfield signals such as e.g. Ambisonics carry a representation of a desired sound field. Methods and apparatus for improved decoding an audio soundfield representation for audio playback comprise receiving, by a processor configured to decode the audio soundfield representation, the audio soundfield representation, receiving, by the processor, a decode matrix for decoding the audio soundfield representation to determine a decoded audio signal. The decode matrix is based on an inverse of a mode matrix, and the coefficients of the mode matrix relate to information for a panning based on positions of loudspeakers over a unit sphere. The mode matrix is further based on an order N. The decoded audio signal is determined based on a multiplication of the decode matrix and the audio soundfield representation.

公开(公告)号：US20170070840A1

公开(公告)日：2017-03-09

申请号：US15357810

申请日：2016-11-21

Applicant: Dolby Laboratories Licensing Corporation

Inventor： Sven KORDON ,  Johann-Markus BATKE ,  Alexander KRUEGER ,  Mark R. P. THOMAS

IPC: H04S7/00 ,  H04R3/00

CPC classification number: H04S7/307 ,  H04R1/326 ,  H04R1/406 ,  H04R3/005 ,  H04R5/027 ,  H04R29/005 ,  H04R2201/401 ,  H04S3/002 ,  H04S2400/15 ,  H04S2420/11

Abstract: Spherical microphone arrays capture a three-dimensional sound field (P(Ωc, t)) for generating an Ambisonics representation (Anm(t)), where the pressure distribution on the surface of the sphere is sampled by the capsules of the array. The impact of the microphones on the captured sound field is removed using the inverse microphone transfer function. The equalisation of the transfer function of the microphone array is a big problem because the reciprocal of the transfer function causes high gains for small values in the transfer function and these small values are affected by transducer noise. The invention minimises that noise by using a Wiener filter processing in the frequency domain, which processing is automatically controlled per wave number by the signal-to-noise ratio of the microphone array.

Abstract translation: 球形麦克风阵列捕获用于产生Ambisonics表示（Anm（t））的三维声场（P（Ωc，t）），其中球体表面上的压力分布由阵列的胶囊取样。 使用反向麦克风传递功能可以消除麦克风对拍摄声场的影响。 麦克风阵列的传递函数的均衡是一个大问题，因为传递函数的倒数对传递函数中的小值造成高增益，这些小值受传感器噪声的影响。 本发明通过使用频域中的维纳滤波处理来最小化噪声，该处理根据麦克风阵列的信噪比自动控制每波数。