电子学报 ›› 2021, Vol. 49 ›› Issue (1): 14-22.DOI: 10.12263/DZXB.20200010

• 学术论文 • 上一篇    下一篇

非均匀二次声源分布下的2.5D高阶Ambisonics声场合成算法

董石1, 章强1, 谢夏风1, 钟睿2   

  1. 1. 华中师范大学教育信息技术学院, 湖北武汉 430000;
    2. 华中师范大学计算机学院, 湖北武汉 430000
  • 收稿日期:2019-12-19 修回日期:2020-04-30 出版日期:2021-01-25 发布日期:2021-01-25
  • 作者简介:董石 男,1986年12月出生,湖北武汉人.2008年和2014年分别在华中科技大学、武汉大学获工学学士和工学博士学位.现为华中师范大学教育信息技术学院讲师,硕士生导师.主要研究方向为音频信号处理、三维声场技术、信号压缩技术.E-mail:dongshi@mail.ccnu.edu.cn;章强 男,1996年9月出生,安徽铜陵人.现为华中师范大学教育信息技术学院硕士研究生.主要研究方向为语音合成、语音信号处理.E-mail:751938379@qq.com
  • 基金资助:
    国家自然科学基金(No.61702472);中央高校基本科研业务费专项资金(No.CCNU17XJ012)

Non-Uniform Secondary Source Distribution for 2.5D Higher Order Ambisonics Sound Field Synthesis

DONG Shi1, ZHANG Qiang1, XIE Xia-feng1, ZHONG Rui2   

  1. 1. School of Educational Information Technology, Central China Normal University, Wuhan, Hubei 430000, China;
    2. School of Computer, Central China Normal University, Wuhan, Hubei 430000, China
  • Received:2019-12-19 Revised:2020-04-30 Online:2021-01-25 Published:2021-01-25
  • Supported by:
     

摘要: 为了提高感兴趣区域音源的声场合成质量,提出了一种非均匀二次声源分布的声场分析与合成方法.首先,将连续二次声源的采样分为两个不同的采样区域,在总扬声器数目一定的情况下,增大感兴趣区域的样点数目并减少感兴趣区域外样点数目.然后,利用采样混叠矩阵的Hermitian特性,使用瑞利熵来估计不同非均匀采样方案的最大误差,以指导非均匀采样方案的选择.最终得到非均匀二次声源驱动信号的频域计算方法.实验结果表明在2.5D圆形区域边界下,所提非均匀排布方法与典型的均匀排布的最佳模态带宽相比,对感兴趣区域音源的无混叠半径提高了12.9%~22.6%,验证了提出方法的有效性.

 

关键词: 声信号处理, 非均匀采样, 声场合成, 球谐函数

Abstract: In order to improve the sound field synthesis quality of the sound source in the region of interest,a non-uniform secondary source distribution method for sound field analysis and synthesis is proposed.First,the sampling of the continuous secondary source is divided into two different sampling regions.With a certain number of loudspeakers,the number of samples in the region of interest is increased and the number of samples outside the region of interest is reduced.Then,using the Hermitian characteristic of the sampling aliasing matrix,Rayleigh entropy is used to estimate the maximum error of different non-uniform sampling schemes to guide the selection of non-uniform sampling schemes.Finally,the frequency domain calculation method of the driving signal for the non-uniform secondary source distribution is obtained.The experimental results show that the proposed non-uniform distribution method improves the aliasing-free radius by 12.9%~22.6% for the sound sources from the region of interest under the 2.5D circular boundary condition,compared with the optimal modal bandwidth of the uniform distribution.The effectiveness of the proposed method is verified.

Key words: acoustic signal processing, non-uniform sampling, sound field synthesis, spherical harmonics

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