主動式噪音消除之耳機設計

Design of Active Noise-Canceling Earphones

李顏竹(Yen-Chu Lee)

指導教授 ： 王多柏

國立臺北科技大學/電資學院/電腦與通訊研究所/碩士(2014年)

摘要

由於原有的噪音抑制技術，通常都使用被動式吸音或隔音材質來抑制噪音，減少噪音的強度。但類似的這些方法和技術並沒辦法在低頻上有效的抑制噪音或降低噪音對人體的影響，因此，本文提出了主動式噪音消除技術，這可有效在低頻抑制噪音使噪音在其頻率上得到良好的控制。再針對前饋式噪音消除技術和回饋式噪音消除技術做分析、設計和實現進行研究與探討。其中在控制原理上是使用FXLMS演算法來實現，同時利用系統中使用的耳塞和耳機結構來提升被動的消噪效果，讓原本主動式消噪耳機的效果更加的顯著。

關鍵字

主動式消噪 ； 前饋式 ； 回饋式。

並列摘要

Since the original noise suppression technology, always using passive sound absorption or isolation materials to suppress noise and reduce the intensity of the noise. However, these methods and techniques like not very well in the effective suppression of low-frequency noise or reduce the impact of noise on the human body, therefore, this paper presents the active noise canceling technology, which can effectively suppress noise at low frequency to make noise to get on their frequency good control. Then focus for feed-forward noise cancellation technology and feedback technology to do the analysis, design and implementation of research and discussion. On the control principle is to use the algorithm to achieve FXLMS while using earplugs and earphones structures used in the system to enhance passive noise cancellation effect, so that the original active noise canceling earphones effect is more significant.

並列關鍵字

Active noise cancellation ； feed-forward type ； feedback type

參考文獻

[2] 魏彰志, 主動式噪音控制於耳罩上之應用, 國立台北科技大學車輛工程系碩士論文, 2007.

[19] 台北科技大學車輛工程系半迴無響室規範，使用手冊，1998。

[4] H. F. Olson and E.G. May, “Electronic Sound Absorber,” J. Acoustic Soc. Am., 25, Nov.1953, pp. 1130-1136.

[5] H. F. Olson, “Acoustic Electronic Control of Noise, Vibration, and Reverberation,” J. Acoustic Soc. Am., vol. 28, Sept. 1956, pp. 966-972.

[6] B. Widrow and S. D. Stearns, Adaptive Signal Processing, Cliffs, NJ: Prentice-Hall, 1985.