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博碩士論文 etd-0829112-113245 詳細資訊
Title page for etd-0829112-113245
論文名稱
Title
固定階數最佳化主動式噪音控制耳機設計
Fixed-Order Optimal Controller Design of an ANC Headphone
系所名稱
Department
畢業學年期
Year, semester
語文別
Language
學位類別
Degree
頁數
Number of pages
43
研究生
Author
指導教授
Advisor
召集委員
Convenor
口試委員
Advisory Committee
口試日期
Date of Exam
2012-08-09
繳交日期
Date of Submission
2012-08-29
關鍵字
Keywords
主動式噪音消除耳機、回授控制、靈敏度函數塑型、最佳控制、固定階數控制器
fixed-order controller design, optimal control, sensitivity shaping, feedback control, active noise cancellation headphone
統計
Statistics
本論文已被瀏覽 5674 次,被下載 5214
The thesis/dissertation has been browsed 5674 times, has been downloaded 5214 times.
中文摘要
本論文以回授方式來設計主動式噪音消除(Active Noise Cancellation, ANC)耳機。主動式噪音控制耳機的架構為類比控制器、音頻功率放大器、耳機喇叭、微型麥克風和麥克風放大器所組成的回授迴路。控制器設計引用R. Nagamune和A. Blomqvist於2005年提出的階數限制的靈敏度函數塑型法。和傳統的H2/H∞的最佳化方法相比,這個方法的好處為免去了選取解析的權重函數和以低階控制器的實現時的要做的控制器降階等步驟。本論文設計出以五階的控制器控制的ANC耳機,實測結果顯示它最大的消噪在200Hz附近達到了19.7dB,在控制頻帶107Hz到523Hz的噪音消除能力可以達到10dB以上。而且在控制頻帶外噪音的增長不超過4.26dB。
Abstract
This thesis presents a feedback design for an active noise cancellation (ANC) headphone. The designed ANC headphone consists of an analog controller, an audio power amplifier, a headphone speaker, a mini microphone, and a microphone amplifier, which constitute a feedback loop. The controller design follows the method of feedback sensitivity shaping with degree constraint introduced by R. Nagamune and A. Blomqvist in 2005. The advantage of this method is that it eliminates the needs for choosing an analytic weighting function and performing model reduction to yield a lower-order controller, as commonly required in conventional H2/H∞ optimizations. A fifth-order analog controller for the ANC headphone is designed. The experimental result shows a maximum acoustic noise reduction of 19.7 dB near 200 Hz and an overall noise reduction of more than 10 dB in the control frequency band from 107 Hz to 523 Hz. Moreover, the out-of-band noise amplification is limited to a barely noticeable level of 4.26 dB.
目次 Table of Contents
論文審定書 i
誌謝 ii
中文摘要 iii
英文摘要 iii
第一章 主動式噪音控制耳機簡介 1
1.1 組成與原理 1
1.2 控制器設計 3
1.3 研究目標 5
第二章 階數限制的靈敏度函數塑型法 6
2.1 階數限制的靈敏度函數塑型法簡介 6
2.2 設計流程 11
第三章 ANC耳機的設計 13
3.1 功率放大器與麥克風接收電路 13
3.2 系統鑑別 15
3.3 控制器設計 18
3.4 模擬結果 20
第四章 耳機控制器實作電路與性能量測結果 23
4.1 控制器的實現 23
4.2 性能量測 29
4.3 與其他設計法的比較 31
第五章 結論 32
參考文獻 33
參考文獻 References
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