Rafaely Boaz, Balmages Ilya, Eger Limor
Department of Electrical and Computer Engineering, Ben-Gurion University of the Negev, Beer-Sheva 84105, Israel.
J Acoust Soc Am. 2007 Nov;122(5):2661-8. doi: 10.1121/1.2783204.
The spatial and temporal distribution of early reflections in an auditorium is considered important for sound perception. Previous studies presented measurement and analysis methods based on spherical microphone arrays and plane-wave decomposition that could provide information on the direction and time of arrival of early reflections. This paper presents recent results of room acoustics analysis based on a spherical microphone array, which employs high spherical harmonics order for improved spatial resolution, and a dual-radius spherical measurement array to avoid ill-conditioning at the null frequencies of the spherical Bessel function. Spatial-temporal analysis is performed to produce directional impulse responses, while analysis based on the windowed Fourier transform is employed to detect direction of arrival of individual reflections at selected frequencies. Experimental results of sound-field analysis in a real auditorium are also presented.
礼堂中早期反射声的时空分布对于声音感知很重要。先前的研究提出了基于球形传声器阵列和平面波分解的测量与分析方法，这些方法能够提供早期反射声的到达方向和时间信息。本文介绍了基于球形传声器阵列的室内声学分析的最新成果，该阵列采用高球谐阶数以提高空间分辨率，并采用双半径球形测量阵列来避免在球形贝塞尔函数的零频率处出现病态问题。进行时空分析以产生定向脉冲响应，同时采用基于加窗傅里叶变换的分析来检测选定频率下各个反射声的到达方向。还给出了在实际礼堂中进行声场分析的实验结果。
