Measurement of spatial information in sound fields by closely located four point microphone method.
Measurement of spatial information in sound fields by closely located four point microphone method.
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通过紧密定位的四点麦克风方法测量声场中的空间信息。
DOI：
10.1250/ast.10.101
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发表时间：
1988
期刊：
影响因子：
--
通讯作者：
T. Itow
中科院分区：
文献类型：
--
作者：
Y. Yamasaki;T. Itow
在对室内声场进行估计时，掌握空间信息，特别是早期反射周期的信息是非常重要的。本文讨论了从直角坐标轴上原点和距原点等距离（3 ~ 5cm）的三个点的脉冲响应中获取声场空间信息的方法。由这四个脉冲响应，用相关技术或强度技术计算虚像源的坐标和功率。音乐霍尔斯、歌剧院和许多其他声场都是用这种技术测量的。给出了某些音乐霍尔斯的虚像源分布和指向性图。
When we estimate a sound field in a room, it is important to grasp the spatial informa-tion, especially of the early reflection periods. In this paper we'll discuss a way to grasp the spatial information of sound fields from impulse responses measured at closely located four points, the origin and three points of the same distance (3∼5cm) from the origin on the rectangular coordinate axes. From these four impulse responses the coordinates and powers of virtual image sources are calculated by correlation technique or intensity technique. Concert halls, opera theaters and many other sound fields are measured by this technique. The distributions of virtual image sources and directivity patterns of some concert halls are shown.