主動式噪音控制於耳罩上之應用

Application of Active Noise Control in Headset

魏彰志(Chang-Chih Wei)

指導教授 ： 劉興華

國立臺北科技大學/機電學院/車輛工程系所/碩士(2007年)

https://doi.org/10.6841/NTUT.2007.00451

摘要

傳統的噪音抑制技術，大多使用被動式吸音及隔音材料，來減少噪音及傳遞。但此種技術應用在低頻噪音時，往往效果不彰。主動式噪音控制因而產生，其對低頻之噪音消除效果較佳。本論文主要是針對回授式主動降噪耳罩的分析、設計及實現進行研究。主動式降噪耳罩可被使用在吵雜的環境中保護專業人員，例如飛機機艙、大型機器機房、重型車輛及軍用車輛等。控制理論是使用FXLMS演算法來實現，並考慮系統中存在第二路徑之效應，利用系統鑑別的方式求得第二路徑轉移函數，以達到噪音消除之效果。

關鍵字

主動式噪音控制 ； FXLMS ； 耳罩

並列摘要

Most noise reduction techniques are using passive methods such as acoustic absorption materials and barriers to attenuate the undesired noise in the past. But it is ineffective in low-frequency problem. Active noise control is then developed to reduce low-frequency noise. This thesis studies active noise-cancellation headsets with feedback control. Active noise-cancellation headsets can protect personnel in a highly noisy environment such as aircraft cabin, utility room, heavy truck or military vehicles. The active noise-cancellation headset is implemented with FXLMS algorithm which takes the secondary path of the system into account in this study and the transfer function of secondary path is obtained from system identification

並列關鍵字

Active noise control ； FXLMS ； Headset

參考文獻

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