以軟體為基準的助聽器模擬平台之發展-回饋音消除

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姓名

林柏勛(Po-Hsun Lin) 查詢紙本館藏

畢業系所

電機工程學系

論文名稱

以軟體為基準的助聽器模擬平台之發展-回饋音消除
(Development of a software-based simulation platform of hearing aid -feedback cancellation)

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摘要(中)

本論文主要是發展一個以軟體為基準的助聽器模擬平台，提供給臨床人員或醫生一個輔助工具，對於聽力損傷的病患在配戴助聽器之前，可以先透過我們發展的平台，不需經過實體助聽器的試用就可立即體驗助聽器的功能，幫助他們找到適合自己的助聽器。助聽器模擬平台主要包含回饋音消除(feedback cancellation)、噪音消除(noise reduction)與放大器。而本研究的主軸在回饋音消除的部份。在放大器部分我們目前採用線性放大來近似模擬回饋音的產生。本論文透過專利文獻來近似模擬GN Resound Canta、Oticon Syncro、Sonic Natura這三家著名的助聽器公司演算法，他們的方法都是基於適應性濾波器(adaptive filter)的原理發展出來的，本研究顯示適應性濾波器的收斂係數會影響估測誤差，模擬結果也顯示我們均能有效近似模擬各廠牌的回饋音消除演算法並消除回饋音的能量，且不論是回饋音路徑的改變或是在噪音的環境下，仍然可以維持不錯的回饋音消除的性能。

摘要(英)

The main purpose of this study is to develop a software-based simulation platform of hearing aid. To offer an assistive tool for clinician. For people with hearing loss before fit hearing aid, they can use our platform, don’t need to test by hearing aid that can experience function of hearing aid. To help them to find a hearing aid that fit them. Simulation platform of hearing aid includes feedback cancellation, noise reduction and amplifier. The main part of our research focuses on feedback cancellation. We adopted linear amplification to simulate feedback in the amplifier. In this paper we simulate algorithms for GN Resound Canta,Oticon Syncro, and Sonic Natura of Hearing Aid Company by patents. Their means were developed based on adaptive filter’s theory. We show the step size of adaptive filter will affect the estimate error. Simulation results show we can simulate algorithms of Hearing Aid Company efficiently and cancel energy of feedback. And it still remains the good performance of feedback cancellation under variation of feedback path or in the noise environment.

關鍵字(中)

★ 助聽器
★ 回饋音消除
★ 適應性濾波器

關鍵字(英)

★ Hearing aids
★ Feedback cancellation
★ Adaptive filter

論文目次

目錄
摘要 I
Abstract II
致謝 III
目錄 IV
圖目錄 VI
表目錄 X
第一章緒論 1
1.1 研究動機 1
1.2 助聽器的基本結構與相關問題 2
1.3 助聽器之回饋音介紹 5
1.4 助聽器平台文獻探討 7
1.5 論文內容架構 10
第二章回饋音消除理論與方法 12
2.1 適應性濾波器的原理 13
2.2 助聽器公司使用的方法 17
2.2.1 GN Resound Canta助聽器 17
2.2.2 Oticon Syncro助聽器 23
2.2.3 Sonic Natura助聽器 28
第三章助聽器模擬平台與實驗方法 32
3.1 實驗設備 32
3.2 實驗步驟與評估方法 33
3.2.1 模擬回饋音 33
3.2.2 模擬回饋音消除 38
3.2.3 評估方法 39
3.3 助聽器模擬平台 40
第四章結果與討論 44
4.1 波形分析結果與討論 44
4.1.1 實驗ㄧ：安靜的環境下，兩種回饋音路徑 44
4.1.2 實驗二：噪音的環境下，兩種回饋音路徑 50
4.2 功率頻譜圖分析結果與討論 55
4.3 輸入不同語料的分析結果與討論 62
4.4 改變收斂係數產生的影響 67
第五章結論與未來展望 71
5.1 結論 71
5.2 未來展望 72
參考文獻 73

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指導教授

吳炤民(Chao-Min Wu)

審核日期

2009-7-28

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