以個人數位助理為平台之短暫誘發耳聲傳射檢測儀

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姓名

劉致中(Jhih-Jhong Liou) 查詢紙本館藏

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電機工程學系

論文名稱

以個人數位助理為平台之短暫誘發耳聲傳射檢測儀
(A PDA-based transient evoked otoacoustic emission (TEOAE) system)

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摘要(中)

台灣新生兒聽力篩檢計畫早在1998年就已經開始推廣，但因為檢測儀器昂貴與自費的緣故，新生兒接受聽力篩檢的比率仍然偏低。本研究的目的是建構以個人數位助理為平台之短暫誘發耳聲傳射檢測儀。本系統在耳聲傳射擷取程序中，除了以衍生非線性響應(derived nonlinear response, DNLR)來消除刺激音，還使用平均的方式來降低雜訊。在聽力判定上的標準以再現性大於70 %且五個頻帶中至少三個頻帶通過為聽力正常。為了驗證本系統的功能，針對年齡約為22-79歲的6位正常聽力(Normal-Hearing, NH)和4位聽損(Hearing-Impaired, HI)的個案進行實測，實測結果與Otodynamics (Hatfield, Herts, UK)所生產的ILO292作資料比對，發現兩者對個案的聽力判定結果皆相同，並在時頻域圖上發現相似的頻率分佈與波形，由此證明本系統運用在聽力篩檢上是可行的。

摘要(英)

Promotion of newborn hearing screening has been proposed since 1998. However, the low hearing screening percentage of the newborn remains because of expensive device and consequent high screening cost. The purpose of this study was to develop a PDA-based transient evoked otoacoustic emission (TEOAE) system. In addition to eliminate stimuli with derived nonlinear response (DNLR) method, the system decreased noise by averaging repeated acquired otoacoustic emission signals. Reproducibility over 70 % and three out of five passed frequency bands were used as criteria to determine if the hearing screening is passed or not. TEOAEs of six normal hearing and four hearing impaired subjects (22 - 79 yrs.) were measured to verify functions of our system. The measured results of our system were then compared with the screening results from commercial device ILO292 (Otodynamics Ltd, Hatfield, Herts, UK) and showed that both systems have the same screening results and similar wave forms and frequency distribution. These results indicated that the transient evoked otoacoustic emission system developed from this study could be used for hearing screening.

關鍵字(中)

★ 新生兒聽力篩檢
★ 短暫誘發耳聲傳射
★ 個人數位助理
★ 耳聲傳射
★ DNLR

關鍵字(英)

★ PDA
★ otoacoustic emissions
★ DNLR
★ newborn hearing screening
★ transient evoked otoacoustic emission

論文目次

摘要..........................................I
Abstract.....................................II
致謝.........................................III
目錄.........................................IV
圖目錄.......................................VII
表目錄.......................................X
第一章緒論...................................1
1.1研究動機.................................1
1.2文獻探討.................................3
1.3論文架構.................................8
第二章耳聲傳射................................9
2.1生理機制.................................9
2.2發展背景................................10
2.3耳聲傳射特性.............................11
2.4測量方法................................13
2.5市售儀器介紹.............................15
第三章研究方法...............................17
3.1系統架構................................17
3.2硬體系統架構.............................19
3.2.1個人數位助理(PDA)....................20
3.2.2 USB to RS232模組...................20
3.2.3放大電路與增益控制電路.................21
3.2.4濾波電路............................22
3.2.5箝位衰減電路.........................22
3.2.6 PIC單晶片控制電路及數位類比轉換電路.....22
3.3軟體系統架構.............................26
3.3.1軟體操作步驟.........................34
第四章實測結果與討論...........................36
4.1硬體電路驗證.............................36
4.1.1刺激音的寬度與大小....................36
4.1.2 DNLR的刺激音序......................38
4.1.3類比濾波器驗證........................39
4.2軟體程式驗證..............................40
4.2.1穩定度驗證............................40
4.2.2刺激音的聲壓大小.......................41
4.2.3數位濾波器驗證........................43
4.3個案實測.................................47
4.4討論.....................................49
4.4.1聽力圖與各頻帶聽力判定結果...............49
4.4.2實測結果與ILO292各個頻帶比較.............52
4.4.3實測結果與ILO292時頻域圖比較.............56
4.4.4模擬聽力損失個案- 0.5 ml Cavity........68
4.4.5刺激音大小............................68
4.4.6刺激音的殘留...........................69
4.4.7耳聲傳射的低頻訊號強度...................70
4.4.8取樣次數對聽力判定的影響..................70
第五章結論與未來展望.............................73
5.1結論......................................73
5.2未來展望...................................74
參考文獻........................................75

參考文獻

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指導教授

吳炤民(Chao-Min Wu)

審核日期

2011-8-27

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