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1、前言为了减轻或防止由于风而引起的传声器噪声,往往采用防风罩。不过,使用防风罩时与仅用传声器时相比,其声学特性是有变化的。我们通过防风罩的试制,考察了防风罩的声学特性。对不同大小的防风罩、不同风速和采用不同实验方法时的减小风噪声的效果进行了研究,并取得良好结果。而且.在各种防风罩材料的声学特性和材料的流阻间的关系上,也获得了一些有关的资料。最后又作了防风罩在雨中的实验,掌握了防风罩在雨水冲击下所产生的噪声级和频率成分,并得出了防风罩也适于雨中使用的结论。2、实验2.1关于防风罩材料的研究人们希望防风罩的材料要能充分满足使
1, Introduction In order to reduce or prevent microphone noise caused by the wind, often using a windshield. However, when using a draft shield, the acoustical properties are changed compared to when using a microphone alone. Through the prototype of the draft shield, we examined the acoustic characteristics of the draft shield. The effects of windshield of different sizes, different wind speeds and wind noise reduction with different experimental methods were studied and good results were obtained. Moreover, some relevant information has also been obtained on the relationship between the acoustic properties of various windshield materials and the flow resistance of materials. Finally, the experiment of windshield in the rain was made and the noise level and frequency components of the windshield under the impact of rainwater were mastered. The conclusion that windshield was also suitable for rain use was obtained. 2, Experiment 2.1 Windshield material research It is hoped that the windshield material should be able to fully meet the