Abstract
With the development of communication technology and computer technology ,corresponding around its electronics industry will also have tremendous room to grow, and the corresponding technical requirements and performance indicators are getting higher and higher, electret microphone as the subsidiary electronic products of communication technology and computer technology because of their superior performance, making a wide range of developers and users love it.
This paper introduces electret principle and structure, as well as the function of important components, as the users’ requirements of the electret microphone performance in the growing, the paper also further explore a number of factors that impact the performance of electret microphone, Through experiments measured a number of corresponding data. Such as the different surface potential corresponding sensitivity, the difference from of plastic ring corresponding sensitivity, the different voltage test corresponding sensitivity , this paper also qualitative analysis the impact of electret microphone sensitivity by the number of holes on the back plate and the thickness of the diaphragm. To meat the market demands, it also introduced the undirectional microphones after improving its structure and study its performance and make a qualitative analysis.
Keywords: electret sensitivity undirectional Frequency response curve