主动降噪耳机

目
次
一、相關說明…………..………………………………………1 二、摘要………………………………………..………………3 三、內容原理…………………………………………………..4
3.1 噪音控制基本原理.......................................................4
3.2 ANC基本架構及演算法..………………………….5
3.3 以單晶片實現主動式降噪耳機之設計……………11 四、實驗結果………………………………………………….24 五、結論……………………………………………………….27 六、隊員工作劃分…………………………………………….28
圖目錄
圖 1 ANC 原理示意圖…………………………………………………………4 圖 2 主動式噪音控制前饋式結構……………………………………………..5 圖 3 主動式噪音控制回饋式結構………………………………………….….5 圖 4 LMS 適應性演算法………………………………………………………6 圖 5 建立第二路徑估計函數…………………………………………………..8 圖 6 Filter-X LMS 演算法…………………………………………………….8
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一、相關說明
1.與何單位之技術合作或協助研究？或曾接受何單位之經費贊助？ 2.曾引用何者之研究成果或作品等？（請詳細說明） 3.本作品如在競賽前曾經有獲獎，請加以說明。 4.就作品之創新性、完整性、可用性與完整性等加以說明。
１. 曾獲單位贊助
無ቤተ መጻሕፍቲ ባይዱ
２. 引用以下學術期刊 [1] P. Lueg, Process of silencing sound oscillations, US Patent 2,043,416, 1936. [2] S. M. Kuo, and D. R. Morgan, Active noise control systems: algorithms and DSP implementation,
九十八年度全國微電腦應用系統設計製作競賽
系統設計說明文件
作品名稱：主動式降噪耳機 參賽組別：研究所組 參賽類別：第一優先：控制類
第二優先：信號處理與通訊類 第三優先：嵌入式系統類 學校名稱：中原大學 科系所名稱：電機工程系 指導老師：ˍˍˍˍˍˍˍ（簽名） 隊員姓名：李聖庭 徐宏瑋
注意事項：以上資料必須與網路報名填寫資料一致，如資料不一致，以 網路報名填寫資料為準。
圖 17 硬體實際測量圖以及 error microphone into PHILIPS SHP2000…24
圖 18 利用麥克風來代替人類聽覺…………………………………………24 圖 19 單頻噪音降噪效果 400Hz………………………………………….….25 圖 20 單頻噪音降噪效果 800Hz………………………………………….….25 圖 21 寬頻噪音降噪效果 250Hz~300Hz…………………………………….25 圖 22 500Hz 聲音訊號加上 300 Hz~400 Hz 的寬頻噪音降噪效果…..…...26
圖 7 Feedback FXLMS 演算法……………………………………………….9
圖 8 Output-Limit FFXLMS 演算法………………………………………..11 圖 9 應用 Output-Limit FFXLMS 架構於 ANC 耳機……………………...13
圖 10 主動式降噪耳機硬體架構…………………………………………….14 圖 11 直流電壓升壓電路……………………………………………………..15 圖 12 音樂輸入電路…………………………………………………………..16 圖 13 麥克風放大電路………………………………………………………..17 圖 14 R2R 型 8 位元 D/A 轉換電路(1)……………………………………18 圖 15 R2R 型 8 位元 D/A 轉換電路(2)……………………………………18 圖 16 音樂與次級噪音輸出電路……………………………………………20
89, no. 5, pp. 843-850, 2009. [5] A. Carini and G. L. Sicuranza, “Optimal regularization parameter of the multichannel filtered-x
affine projection algorithm,” IEEE Trans. Signal Processing, vol. 55, no. 10, pp. 4882-4895, 2007. [6] E. P. Reddy, D. P. Das, and K. M. M. Prabhu, “Fast adaptive algorithms for active control of