| 重放自由场虚拟源距离信息的动态双耳Ambisonics方法 |
| |
| 引用本文： | 谢菠荪,刘路路,江建亮.重放自由场虚拟源距离信息的动态双耳Ambisonics方法[J].声学学报,2021,46(6):1223-1233. |
| |
| 作者姓名： | 谢菠荪 刘路路 江建亮 |
| |
| 作者单位： | 1. 华南理工大学 物理与光电学院声学研究所 广州 510641; |
| |
| 基金项目： | 国家重点研发计划项目(2018YFB1403800)亚热带建筑科学重点实验室项目资助 |
| |
| 摘 要： | 双耳重放的目标之一是在耳机重放中产生不同方向和距离的虚拟源感知。本文研究了动态双耳Ambisonics重放自由场虚拟源方向和距离信息的简化信号处理方法。该信号处理方法包括两步:第1步是基于目标声场的球谐函数分解,合成采用扬声器的近场Ambisonics重放中逐级重构目标声场的信号;第2步是采用虚拟扬声器重放的方法,用动态头相关函数滤波处理将Ambisonics的扬声器重放信号转换为双耳重放信号并用耳机重放。进一步研究了动态双耳Ambisonics的阶数对定位效果的影响,为简化信号处理提供依据。对重放产生的双耳声压分析表明,5阶动态双耳Ambisonics重放足以提供听觉方向定位和距离感知的重要信息。同时心理声学的实验结果表明,结合声源距离相关的响度因素,5阶动态双耳Ambisonics重放可产生不同方向和1.0 m以下不同近场距离的自由场虚拟源的听觉感知。本文的方法仅需要固定距离的48个均匀空间方向的远场非个性化HRTF处理,实现了信号处理的简化。
|
| 关 键 词： | 空间听觉 距离定位 双耳Ambisonics 头相关传输函数 |
| 收稿时间： | 2021-04-15 |
Dynamic binaural Ambisonics scheme for rendering distance information of free-field virtual sources |
| |
| Institution: | 1. Acoustic Lab, School of Physics and Optoeletronics, South China University of Technology, Guangzhou 510641;2. State Key Laboratory of Subtropical Building Science, South China University of Technology, Guangzhou 510641 |
| |
| Abstract: | One object of dynamic binaural rendering is to recreate virtual source in various directions and distances in headphone reproduction.A simplified signal processing scheme for recreating directional and distance information in dynamic binaural rendering is presented in this work.The signal processing scheme includes two steps.The first step is to synthesize the loudspeaker signals in near-field Ambisonics for reconstruction of target sound field by using spherical harmonics functions decomposition and each order approximation.The second step is to convert the Ambisonics signals for loudspeaker reproduction into the binaural signals for headphone reproduction using the dynamic Head-Related Transfer Function(HRTF) -based binaural synthesis or virtual loudspeaker method.The effects of the order of binaural Ambisonics on localization performance in reproduction were further investigated to provide guidance for simplifying the scheme.Analysis on the binaural pressures in reproduction indicated that the 5th dynamic binaural Ambisonics reproduction was adequate to provide major information for directional localization and distance perception.Psychoacoustic experiment proved that,combined with distance-dependent loudness cue,the 5th dynamic binaural Ambisonics reproduction was able to recreate the auditory perception of virtual at various directions and distance closer than 1.0 m.The present scheme only requires non-individualized HRTFs at a constant far-field distance and 48 uniform directions for binaural synthesis and thereby simplifies the signal processing. |
| |
| Keywords: | |
|
| 点击此处可从《声学学报》浏览原始摘要信息 |
| 点击此处可从《声学学报》下载免费的PDF全文 |
