College of Marine, Northwestern Polytechnical University, 710072 Xi'an, Peoples Republic of China.
J Acoust Soc Am. 2011 Apr;129(4):1681-4. doi: 10.1121/1.3531955.
An alternative method for measuring the normal incidence sound transmission loss (nSTL) is presented in this paper based on the time-domain separation of so-called Butterworth pulse with a short-duration time about 1 ms in a standing wave tube. During the generation process of the pulse, inverse filter principle was adopted to compensate the loudspeaker response, besides this, the effect of the characteristics of tube termination can be eliminated through the generation process of the pulse so as to obtain a single plane pulse wave in the standing wave tube which makes the nSTL measurement very simple. A polyurethane foam material with low transmission loss and a kind of rubber material with relatively high transmission loss are used to verify the proposed method. When compared with the traditional two-load method, a relatively good agreement between these two methods can be observed. The main error of this method results from the measuring accuracy of the amplitude of transmission coefficient.
本文提出了一种基于在驻波管中使用持续时间约 1ms 的所谓 Butterworth 短脉冲的时域分离来测量法向入射声传输损耗（nSTL）的替代方法。在脉冲产生过程中，采用逆滤波器原理来补偿扬声器响应，此外，通过脉冲的产生过程可以消除管端特性的影响，从而在驻波管中获得单一平面脉冲波，这使得 nSTL 测量非常简单。使用具有低传输损耗的聚氨酯泡沫材料和具有相对较高传输损耗的一种橡胶材料来验证所提出的方法。与传统的双负载方法相比，这两种方法之间可以观察到较好的一致性。该方法的主要误差源于传输系数幅值的测量精度。
