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研究生:洪晨耘
研究生(外文):Chen-Yun Hong
論文名稱:方向性麥克風實踐於助聽器之方法研究
論文名稱(外文):The Method of Adapting Directional Microphone Function to Hearing Aids
指導教授:楊順聰楊順聰引用關係
指導教授(外文):Shuenn-Tsong Young
學位類別:碩士
校院名稱:國立陽明大學
系所名稱:醫學工程研究所
學門:工程學門
學類:生醫工程學類
論文種類:學術論文
論文出版年:2009
畢業學年度:97
語文別:中文
論文頁數:60
中文關鍵詞:助聽器噪音消除功能方向性麥克風信號雜訊比
外文關鍵詞:hearing aidnoise cancellationdirectional microphonesignal to noise ratio
相關次數:
  • 被引用被引用:2
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  • 下載下載:148
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市售之助聽器一般都具有噪音消除功能,其中一項即為方向性麥克風,主要目的為突顯前方語音訊號和削減後方噪音訊號。本研究主要內容有二:其一為設計自適應性方向性功能演算法,實踐於助聽器上,讓使用者處於複雜聽力環境時,能有效地降低不欲聆聽之噪音訊號,並且當噪音源移動時能有效偵測並加以削減;其二為開發一套噪音/語音偵測系統演算法,自動偵測環境中是否存在語音,藉此調變在不同聽力環境下方向性麥克風開與關之控制。
  將上述兩項演算法分別寫入聲音訊號處理單晶片(型號GA-3280)中,加入各類助聽器元件,組裝完成具有自適應性方向性麥克風功能之助聽器。依據我們演算法所開發之方向性麥克風功能所提供之效益,理想之聲電分析在各頻帶下約可提升5~20 dB SPL之信號雜訊比,模擬真耳量測下約可提升4~13 dB SPL之信號雜訊比;噪音/語音偵測系統在不同聲音類型下平均約有80%以上之辨識率。
Hearing aids commonly with built in noise cancellation technologies, one of them is directional microphone, which the main purpose is to emphasize the speech signal in front and reduce the noise signal in the back. In this study, there are two purposes, firstly, to develop the adaptive directional microphone function algorithm in hearing aids let the hearing aid users who are in complex sound environment can auto-reduce the noise signal effectively, meanwhile detect the moving source of noise and decrease it. Secondly, developing the algorithm of noise / speech detector system to detect whether the speech signal existed or not in the environment, in order to adjust the on and off control of directional microphone in different sound environment.

We burn these two algorithm in the signal processing chip of GA-3280, and fabricate varied elements to complete a hearing aid with adaptive directional microphone function. According to the effectiveness of our directional microphone, the ideal result of ANSI would increase 5~20 dB SPL of signal to noise ratio in each band. In real ear measurement, would increase 4~13 dB SPL of S/N ratio, and in noise / speech detector system measurement, would be above 80% speech identification in different kind of sound environment.
致謝 I
中文摘要 III
英文摘要 IV
目錄 V
圖目錄 VII
表目錄 IX
第一章 緒論 1
1.1 前言 1
1.2 研究動機與目的 2
1.3 論文架構 3
第二章 文獻回顧與相關原理介紹 4
2.1 方向性麥克風功能 4
2.1.1 單麥克風系統 7
2.1.2 雙麥克風系統 8
2.1.3 三麥克風系統 10
2.2 噪音/語音偵測系統 12
第三章 研究方法與流程設計 16
3.1 軟硬體設備介紹 16
3.2 助聽器訊號處理流程 20
3.3 助聽器設計 20
3.3.1 GA-3280 數位信號處理晶片介紹 20
3.3.2 GA-3280 發展板介紹 22
3.4 噪音/語音偵測系統演算法介紹 23
3.5 自適應性方向性功能演算法介紹 25
3.6 助聽器晶片與電腦平台溝通介面 27
3.7 助聽器機構設計與組裝 28
第四章 研究結果與討論 30
4.1 噪音/語音偵測系統驗證 30
4.1.1 語調深度閾值 30
4.1.2 系統準確度驗證 34
4.2 固定性極向圖量測 37
4.3 自適應性方向性功能效益驗證 43
4.3.1 助聽器量測儀器之聲電分析 44
4.3.2 模擬真耳量測之效益計算 47
4.3.3 市售助聽器之方向性效益計算 51
第五章 結論與未來展望 57
參考文獻 59
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