公开(公告)号：US09454971B2

公开(公告)日：2016-09-27

申请号：US14400039

申请日：2013-05-06

Applicant: Dolby Laboratories Licensing Corporation

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

IPC: H04R5/00 ,  G10L19/008 ,  H04S3/00 ,  H04H20/89 ,  H04S3/02

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

Abstract: Higher Order Ambisonics (HOA) represents a complete sound field in the vicinity of a sweet spot, independent of loudspeaker set-up. The high spatial resolution requires a high number of HOA coefficients. In the invention, dominant sound directions are estimated and the HOA signal representation is decomposed into dominant directional signals in time domain and related direction information, and an ambient component in HOA domain, followed by compression of the ambient component by reducing its order. The reduced-order ambient component is transformed to the spatial domain, and is perceptually coded together with the directional signals. At receiver side, the encoded directional signals and the order-reduced encoded ambient component are perceptually decompressed, the perceptually decompressed ambient signals are transformed to an HOA domain representation of reduced order, followed by order extension. The total HOA representation is recomposed from the directional signals, the corresponding direction information, and the original-order ambient HOA component.

Abstract translation: 高阶Ambisonics（HOA）代表一个完美的声场，位于甜蜜点附近，独立于扬声器设置。 高空间分辨率需要大量的HOA系数。 在本发明中，主要声音方向被估计，并且HOA信号表示被分解成时域中的主要方向信号和相关方向信息，以及HOA域中的环境分量，随后通过降低其顺序来压缩环境分量。 将低阶环境分量变换为空间域，并与定向信号一起被感知地编码。 在接收机侧，编码的定向信号和降序编码的环境分量被感知地解压缩，感知解压缩的环境信号被转换为降序的HOA域表示，随后是顺序扩展。 总的HOA表示由方向信号，相应的方向信息和原始阶环境HOA分量重组。