通过方向分布正则化，提升多区域声场还原精度与双耳听感体验。
Multizone sound field reproduction with direction-of-arrival-distribution-based regularization and its application to binaural-centered mode-matching
- 基于波前到达方向分布设计正则化项，抑制远区次级声源增益过大发
- 在多区域声场与双耳中心模匹配中均显著降低远场失真
- 适合高保真沉浸式音频系统研发者及空间音频算法研究者
在高阶Ambisonics声场还原框架中，次级声源驱动信号通常通过正则化模匹配获得。本文提出一种基于原始声场波前到达方向（DoA）分布的正则化方法，有效抑制了远离主声源方向的次级声源驱动信号过大问题，从而提升还原中心以外区域的音质准确性。首先，该正则化方法被应用于基于加法定理的多区域声场还原；其次，进一步拓展至双耳中心模匹配（BCMM），实现双耳处两个还原点，避免高频下甜点区域收缩导致的还原质量下降。通过自由场与双耳仿真验证，该方法在多区域声场还原及BCMM中均展现出优越性能。
原文摘要 · Abstract (English)
In higher-order Ambisonics, a framework for sound field reproduction, secondary-source driving signals are generally obtained by regularized mode matching. The authors have proposed a regularization technique based on direction-of-arrival (DoA) distribution of wavefronts in the primary sound field. Such DoA-distribution-based regularization enables a suppression of excessively large driving signal gains for secondary sources that are in the directions far from the primary source direction. This improves the reproduction accuracy at regions away from the reproduction center. First, this study applies the DoA-distribution-based regularization to a multizone sound field reproduction based on the addition theorem. Furthermore, the regularized multizone sound field reproduction is extended to a binaural-centered mode matching (BCMM), which produces two reproduction points, one at each ear, to avoid a degraded reproduction accuracy due to a shrinking sweet spot at higher frequencies. Free-field and binaural simulations were numerically performed to examine the effectiveness of the DoA-distribution-based regularization on the multizone sound field reproduction and the BCMM.
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