Nonlinear parameter estimation method for moving-coil loudspeaker system

• Main Authors: Chin-Kuo Huang, 黃金國
• Other Authors: 王昭男
• Format: Others
• Language: zh-TW
• Published: 2015
• Online Access: http://ndltd.ncl.edu.tw/handle/99300412604192327331

碩士 === 國立臺灣大學 === 工程科學及海洋工程學研究所 === 103 === In this paper, we propose a nonlinear parameter estimation method for moving-coil loudspeaker system. The performance of moving-coil loudspeaker can be described by using analogous circuits. Second-order deferential equation is a good pattern to mold system directly and some important parameters of moving-coil loudspeaker compose coefficients in this model. In general, those coefficients are constant. However, it is hard to solve equation with coefficient becomes complex. We usually consider that force factor and stiffness cause nonlinear distortion. Hence, we compare data which are calculated from model with data measured effectively. Then, the curve of force factor and stiffness can be estimated with simulated annealing finally. We compensate input signal with estimated nonlinear parameters. It works that reducing total harmonic distortion of real loudspeaker.