Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/2850
標題: 帶外部干擾與線上第二路徑鑑別之改良式主動噪音控制系統
Improved Active Noise Control Systems With Online Secondary Path Modeling and External Disturbance
作者: 劉哲瑀
Liou, Jhe-Yu
關鍵字: 主動噪音控制;active noise control (ANC);外部干擾;線上第二路徑鑑別;最佳步階;可變步階;external disturbance;online secondary path modeling;variable step-size;optimal step-size
出版社: 機械工程學系所
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摘要: 
在主動噪音控制系統中,必須要先鑑別第二路徑的動態轉移函數,而如今有兩種常用的鑑別方法,第一種是離線鑑別方式取得,另一種是使用線上鑑別方式取的,但考慮第二路徑會有時變的情況,另外適應性濾波器的權重更新會受到誤差麥克風測量到不相關噪音,影響消音性能。因此本文提出帶外部干擾與線上第二路徑鑑別之改良式主動噪音控制系統,並用補償器補償過程中的干擾,以提升較好的性能與適應性。

In active noise control (ANC) system, it is necessary to get the transfer function of the secondary path. There are two common methods of identification, first is obtained off-line identification, the other is taken to use the online identification method, however, the secondary path will be a time-variant system, in addition, weights update of an adaptive filter will affected by disturbance picked up by the error microphone, leading to the degradation of system performance. This treatise propose an improved active noise control systems with online secondary path modeling and external disturbance, and compensator used to compensate the disturbance that produced during the processer, in order to promote the control performance and adaptability.
URI: http://hdl.handle.net/11455/2850
其他識別: U0005-2608201317024100
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