Based on the theory of acoustics, this paper analyzes the character of geometrical spreading loss of finite line sound source on three types of directivity-monopole, intermediate pole and dipole.

根据基本声学理论，分析具有单极子、中间和偶极子三种指向性的有限长线声源的几何发散损失特性。

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Sound card frequency meter source code for on-line collection. when downloading use please respect.

声卡频率计源代码，为网上收集的。下载使用时，请尊重原创作者的版权。

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This paper presents a study of the reflection of sound pulse from porous material in the ease that the impulse sound source and receiver are located on a line perpendicular to the surface of material.

本文提出当脉冲声源和接收点在同一条垂直于材料表面的直线上时，声脉冲从多孔材料反射的研究。

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