公开(公告)号：US20210314719A1

公开(公告)日：2021-10-07

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

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：US20190320280A1

公开(公告)日：2019-10-17

申请号：US16457135

申请日：2019-06-28

Applicant: Dolby Laboratories Licensing Corporation

Inventor： Johannes BOEHM ,  Florian KEILER

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

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：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）。