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標題: 可變步長演算法於有無干擾之主動噪音控制系統的研究
A study of Variable Step-Size Algorithms in Active Noise Control Systems with or without Disturbance
作者: 林威廷
Lin, Wei-Ting
關鍵字: Active Noise Control;主動噪音控制;Variable Step-Size;可變步長
出版社: 機械工程學系所
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In practical active noise control (ANC) systems, environmental changes will affect ANC performance. This study proposes two kinds of variable step sizes (VSSs) for the normalized LMS (NLMS) algorithms to deal with the problems caused by environmental changes. One uses a residual error directly to tune step size, while another uses an adaptive method to update step size. A deterministic method is then established to analyze the VSS-based NLMS algorithms such that conditions to ensure convergence of the algorithms in ANC systems can be derived. Four kinds of environmental changes, including change in amplitudes of the primary noise, change in frequencies of the primary noise, change of the primary path, and change of the secondary path, are considered in computer simulations. Simulation results show that the VSS-based algorithms can maintain effective ANC performance under these environmental changes and thus support the feasibility of the proposed VSSs.
其他識別: U0005-1908201112311900
Appears in Collections:機械工程學系所

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