Page 68 - 《应用声学》2024年第1期

第 43 卷 第 1 期 Vol. 43, No. 1
2024 年 1 月 Journal of Applied Acoustics January, 2024

⋄ 研究报告 ⋄

多通路空间声的前方四扬声器局域

Ambisonics信号馈给法 ∗

张 驰 谢菠荪 †

(华南理工大学物理与光电学院 声学研究所 广州 510641)

摘要：典型的多通路空间声扬声器布置一般包含水平面左前、右前，高仰角左前上、右前上 4 个方向的扬声器。
该文提出一种利用该 4 个扬声器产生前方水平与垂直方向虚拟源的一阶局域 Ambisonics 信号馈给法。该信
号馈给法是通过对目标和重放声场进行球谐函数展开并取一阶近似得到。采用简化的头部模型和精确的头相
关传输函数模型分析表明，一阶局域 Ambisonics 信号馈给法可以产生合适的低频听觉定位因素，包括双耳时
间差及其随头部转动的动态变化。虚拟源定位实验结果表明，该方法可以在扬声器布置的范围内，甚至在略超
出扬声器布置的范围内产生不同方位角和仰角的虚拟源。因而该方法可用在多通路空间声重放中产生与图像
配合的虚拟源定位效果。
关键词：局域 Ambisonics；虚拟声；定位
中图法分类号: O428; O429 文献标识码: A 文章编号: 1000-310X(2024)01-0064-12
DOI: 10.11684/j.issn.1000-310X.2024.01.008

Local Ambisonics signal mixing method for four frontal loudspeakers in
multichannel spatial sound

ZHANG Chi XIE Bosun

(Acoustic Lab., School of Physics and Optoelectronics, South China University of Technology, Guangzhou 510641, China)

Abstract: Typical loudspeaker configurations in multichannel spatial sound usually involve loudspeakers in
left-front and right-front directions in the horizontal plane as well as in left-front-high and right-front-high
directions in a high elevation. Using these four loudspeakers, the present work proposes a method of the
first-order local Ambisonics signal mixing to recreate horizontal- and vertical-frontal virtual source in spatial
sound reproduction. The signal mixing is derived by decomposing the target and reproducing sound filed with
spherical harmonic functions and matching them up to the first order. By using a simplified head model and
an exact head related transfer function (HRTF) model, it is demonstrated that the signal mixing method can
create appropriate directional localization cues at low frequency, including interaural time difference and its
dynamic variation with head turning. A virtual source localization experiment indicates that the signal mixing
can recreate virtual source in various azimuths and elevations within or even a little bit beyond the range
of loudspeaker arrangement. Therefore, the method in present work is applicable to recreate virtual source
matching with picture in video-audio reproduction.
Keywords: Local Ambisonics; Virtual sound; Localization

2022-09-24 收稿; 2022-11-29 定稿
国家自然科学基金资助项目 (12174118)
∗
作者简介: 张弛 (1998– ), 男, 湖北人, 硕士研究生, 研究方向: 声学。
† 通信作者 E-mail: phbsxie@scut.edu.cn