臺灣博碩士論文加值系統

本論文使用回授控制技術的共用降噪濾波器來設計主動抗噪音耳機的電路。這個共用降噪濾波器技術有降低主動抗噪音耳機的製造成本與改善耳壓不平衡的問題。本論文設計四個功率放大器與兩個功率放大器兩種形式的共用噪音消除濾波器。從電路模擬中，可以發現四個功率放大器設計的主動抗噪電路具有中心頻率與頻寬容易調整的特性。然而，兩個功率放大器設計的主動抗噪電路有成本低廉的優勢。最後，依據經驗的設定來量測主動抗噪音耳機的降噪量。並將結果與市售的耳機做一個比較。

In this thesis, a common noise reduction filter topology is used in the feedback control technique to design an active noise cancellation (ANC) circuit for headphone. This new topology has the advantage of reducing the manufacturing cost and improving the air pressure imbalance problem of ANC headphone. Two types of common noise reduction filters, there are 4-amplifiers and 2-amplifiers circuits respectively, are designed in this thesis. From circuit simulation, it found that the center frequency and bandwidth of the 4-amplifiers filter can be tuned easily. However, the 2-amplifier filter has the low cost advantage. Finally, the noise cancellation performance of the proposed ANC headphone is measured with an experimental setup. Comparison between the performance has been made with other commercially available ANC headphones.

中文摘要 …………………………………………………………… Ⅰ
ABSTRACT …………………………………………………………… Ⅱ
目錄 ………………………………………………………………… Ⅲ
圖目錄 ……………………………………………………………… IⅤ
表目錄 ……………………………………………………………… ⅤI
一、簡介 …………………………………………………………… 1
1.1 緒論 ………………………………………………………… 1
1.2 主動抗噪音簡介 …………………………………………… 2
1.3 研究動機 …………………………………………………… 5
1.4 論文大綱 …………………………………………………… 7
二、系統簡介 ……………………………………………………… 8
2.1 一般主動抗噪音電路 …………………………………… 8
2.2 四功放組成的主動抗噪音電路 ………………………… 11
2.3 雙功放組成的主動抗噪音電路 ………………………… 16
2.4 共用濾波器的主動抗噪音電路 ………………………… 21
三、量測方式與實驗結果 ……………………………………… 26
3.1 降噪量測方式 …………………………………………… 26
3.1.1 測試系統校準………………………………………… 27
3.2 主動降造電路測試……………………………………… 28
3.3 四功放主動抗噪量測結果 ……………………………… 30
3.4 兩功放主動抗噪量測結果 …………………………… 31
3.5 噪音接收裝置的擺放位置 ……………………………… 32
3.6 喇叭的影響 ……………………………………………… 35
3.7 主動濾波IC的差異性 ………………………………… 36
3.8 Bose標準的Insertion Gain量測 ……………………… 37
3.9 與市售耳機效能的比較 …………………………………… 38
四、結論 ………………………………………………………… 40
參考文獻 …………………………………………………………… 41

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