Analysis of the Baffled Effect for the Microphone System in Portable Communication Devices

• Main Authors: Lin Yu Ju, 林佑儒
• Other Authors: Liu Yu Cheng
• Format: Others
• Language: zh-TW
• Published: 2013
• Online Access: http://ndltd.ncl.edu.tw/handle/37594496803489517584

碩士 === 逢甲大學 === 電聲碩士學位學程 === 101 === With the development of sciences and techniques, a mobile phone has become a necessity in our daily life. To cater for the fantasy of the user, the mobile phone is designed to be slim and light, yet equipped with diversified functions. For that, enhancement it&;#39;s sound clarity and audible frequency range, becomes a major topic nowadays and very challenging in design, the position of the smart phone microphone system is placed at the bottom instead of the traditional front side, and as a result, the characteristics of microphone turn out and be different form the traditional. The object of this thesis is focused on the analysis and discussions in the baffled effect formed by the front faceplate of mobile phone. By using the FEM commercial software, Abaqus, the variations and relationships of sound field with different sizes and positions of baffle are analyzed and modeled. Moreover, those simulating results have perfect agreements with those by the practical experiment, especially in beginning and transforming frequency of baffled effect. Finally, all the simulating results for the baffled effect are integrated within the ECM system. A novel and convenient operating platform in Labview are also constructed.