On Active Noise Control systems with Anti-Noise interference reduction

• Main Authors: Ming-Hua Li, 李明樺
• Other Authors: Wan-De Weng
• Format: Others
• Language: zh-TW
• Published: 2010
• Online Access: http://ndltd.ncl.edu.tw/handle/70070974633446314834

碩士 === 雲林科技大學 === 通訊工程研究所碩士班 === 98 === This thesis is focused on the investigation of the acoustic feedback problem that is aroused when an active noise control (ANC) system is trying to eliminate noise. The Filter-X LMS (FXLMS) structure proposed by M.T. Akhtar is modified in such a way that the step size can be adjusted to an optimal value. The improved algorithm, which is named the modified variable step-size FXLMS (MVS FXLMS), has been demonstrated to achieve faster convergence than FXLMS. Moreover, we have found that, even under lower levels of filter design, MVS FXLMS still exhibits some improvement. This feature helps greatly on reducing its hardware cost. Finally, we use a real noise sources to test the feasibility of the system. Simulation results show that the proposed MVS FXLMS algorithm works satisfactorily well.