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J4  2010, Vol. 44 Issue (4): 812-818    DOI: 10.3785/j.issn.1008-973X.2010.04.032
土木与建筑工程     
镜面与扩散反射界面球形空间语言清晰度比较
张红虎1,2, 张三明1
1.浙江大学 建筑技术科学研究所,浙江 杭州 310058;
2.华南理工大学 亚热带建筑科学国家重点实验室,广东 广州 510640
Comparison of speech intelligibility in spherical spaces of
specularly and diffusely reflecting boundaries
ZHANG Honghu1,2, ZHANG San-ming1
1. Institute of Architectural Science and Technology, Zhejiang University, Hangzhou 310058, China;
2. State Key Laboratory of Subtropical Building Science, South China University of Technology, Guangzhou 510640, China
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摘要:

定量分析扩散反射界面对球形空间内语言清晰度的改善作用.研究限定在几何声学的范畴内,无指向性点声源设在易引起球内声聚焦的典型位置球心上,界面吸声系数均匀分布.分别采用解析法与声学辐射度方法获得镜面与扩散反射界面球形空间的脉冲响应.计算与比较镜面与扩散反射界面球形空间内的脉冲响应和明晰度C50.为了衡量反射界面对球形空间内语言清晰度的改善效果,将球形空间与立方体空间的明晰度C50进行对比.结果表明,在镜面反射界面的球体中,C50值较低,而扩散反射界面能够在整体上提高C50值,尤其是在接近球心的声聚焦区域,但是界面反射模式引起的改善不如形体引起的改善有效.

Abstract:

The performance of diffusely reflecting boundary to improve the speech intelligibility in spherical spaces was quantitatively explored. The research was limited within geometrical acoustics. Omnidirectional point source was set at the sphere center, which is a typical position to cause sound focusing easily in a sphere. The boundary sound absorption coefficient was uniformly distributed. By calculating the sound impulse responses and related parameters, comparisons were made between the sound fields under two boundary reflecting patterns in spheres. Analytical and acoustical radiosity methods were used for the cases of the two types of boundary respectively. Clarity (C50) was adopted as the objective parameter to assess the speech intelligibility. The results showed that C50 is low with specularly reflecting boundary, and diffusely reflecting boundary generally enhances C50, especially in the sound focusing area near the sphere center. However, the improvement caused by the boundary reflection pattern may be still inferior to that caused by room shape.

出版日期: 2010-05-14
:  TU112  
基金资助:

华南理工大学亚热带建筑科学国家重点实验室开放课题资助项目(2008KB21)

通讯作者: 张三明,男,副教授.     E-mail: zhangsm@zju.edu.cn
作者简介: 张红虎(1974—),男,安徽广德人,讲师,主要从事建筑声学研究. E-mail: zhanghh@zju.edu.cn
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引用本文:

张红虎, 张三明. 镜面与扩散反射界面球形空间语言清晰度比较[J]. J4, 2010, 44(4): 812-818.

ZHANG Gong-Hu, ZHANG San-Meng. Comparison of speech intelligibility in spherical spaces of
specularly and diffusely reflecting boundaries. J4, 2010, 44(4): 812-818.

链接本文:

http://www.zjujournals.com/eng/CN/10.3785/j.issn.1008-973X.2010.04.032        http://www.zjujournals.com/eng/CN/Y2010/V44/I4/812

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