Amend Variable Step-size FXLMS Algorithm and Its Application to Active Noise Control Systems

• Main Authors: Jia-wen Lee, 李嘉文
• Other Authors: Wan-de Weng
• Format: Others
• Language: zh-TW
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/28844612734758137843

博士 === 國立雲林科技大學 === 工程科技研究所 === 102 === This thesis is a study focused on single/dual channel active noise control (ANC) system, and attempted to find a solution to the acoustic feedback problem in the second path in the future noise cancellation. First, literature review was conducted to find an applicable architecture [8], and the adaptive algorithm was modified. Then, the variable step size of the existing FXLMS (filter-X LMS) algorithm was adjusted to an optimum value. In terms of single/multichannel in the experiment, the simulation was carried out in single frequency, multifrequency and broadband conditions, and the system convergence rate and noise reduction performance ratio were compared. The purpose was to reduce the filter order and the cost of hardware implementation. On the other hand, the future practical application was considered. The discussion on actual noise and the future architecture used the Electric motor sound of Tzu-Chiang train of Taiwan Railways for noise reduction experiment. The common underground platform architecture, island platform, was used as the concept of multichannel architecture. The experimental data and architecture can serve as the reference for improving the rail traffic noise reduction in the future. The experimental results proved that our AVS-FXLMS algorithm performs better than FXLMS.