以軟體為基準的助聽器模擬平台之發展-語音放大與補償

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研究生：	陳宗佑 Tsung-yu Chen
論文名稱：	以軟體為基準的助聽器模擬平台之發展-語音放大與補償 Development of a Software-Based Simulation Platform for Hearing Aid - Amplification
指導教授：	吳炤民 Chao-min Wu
口試委員:
學位類別：	碩士 Master
系所名稱：	資訊電機學院 - 電機工程學系 Department of Electrical Engineering
畢業學年度：	100
語文別：	中文
論文頁數：	112
中文關鍵詞：	模擬平台、助聽器、語音放大與補償
外文關鍵詞：	Simulation Platform, Hearing Aid, speech amplification fitting、NAL-NL1、DSL[i/o]、HS
相關次數：	點閱：16 下載：0
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本研究的目的在於發展一個以軟體為基準的助聽器模擬平台，而本論文主要是模擬助聽器平台上的語音放大與補償功能，根據聽力損傷者本身的聽力圖，來提供不同的語音補償策略。藉由使用該助聽器模擬平台，讓聽力損傷者了解各種語音補償策略的差異，並選擇較適合自己的語音補償策略。助聽器模擬平台包括含方向性麥克風策略(Directional Microphone)、噪音消除(Noise Reduction)和語音放大(Amplification)。本研究模擬National Acoustic Laboratories Non-Linear version 1(NAL-NL1)、Desired Sensation Level [input/output] (DSL[i/o])與Hearing Speech Engineer (HSE)三種的語音補償策略，並且搭配聽力選配補償放大介面，依照聽力損傷者的聽力圖給予適當的增益補償值。最後透過增益的比較與波形圖、聲譜圖和聆聽聲音，來評估增益補償數值的正確性與語音補償後之效能。從增益補償的結果顯示，DSL[i/o]增益補償最多， NAL-NL1次之，HSE較少；而語音補償後的語音清晰度，則是HSE最好， NAL-NL1次之，DSL[i/o]較差。本論文和過去的研究針對NAL-NL1與DSL[i/o]的比較呈現相同的結果，可能因為HSE策略是針對華語語系所設計的補償策略，所以語音理解較好。在相同的條件下，DSL[i/o]的補償增益最多，但同時也把背景噪音給放大，而造成語音理解度降低。

The purpose of this research is to develop a software-based simulation platform for hearing aids. This study focuses on the simulation of speech amplification and fitting function. This platform provides different speech fitting strategies based on the audiogram of the hearing impaired. Using this platform, the hearing impaired could know the difference between various fitting strategies and select the suitable one. This platform contains directional microphone, noise reduction and fitting strategy. This study simulates National Acoustic Laboratories Non-Linear version 1(NAL-NL1), Desired Sensation Level [input/output] (DSL[i/o]) and Hearing Speech Engineer (HSE) speech fitting strategies. Combined with the interface of hearing fitting, this platform can provide the proper gain-fitting value according to their audiograms. Through the gain comparison, waveform, spectrogram, and listening, the correctness of the gain value and effectiveness of the speech amplification fitting were evaluated. Our simulation result showed that the DSL[i/o] gain is the maximum and HSE is the minimum. However, based on the performance in the speech fitting, HSE is the best and DSL[i/o] is the worst. Our simulation presents similar results with previous research. Under the same condition, the speech intelligibility of HSE is better for Mandarin speech due to its special design for Chinese language, and the DSL[i/o] provides the most gain compensation not only to amplify the background noise but also to lower the speech intelligibility.

摘要	I
Abstract	II
致謝	III
目錄	IV
圖目錄	VII
表目錄	XII
第一章 緒論	1
1研究動機	1
2 助聽器的基本架構與原理	2
2.1 方向性麥克風(Directional Microphone)	3
2.2回饋音消除(Feedback Cancellation)	5
2.3噪音消除(Noise Reduction)	6
2.4 語音放大補償(Amplification)	7
3 文獻探討	9
3.1線性放大	9
3.1.1 POGO	10
3.1.2 NAL	10
3.1.3 DSL	10
3.2非線性放大	11
3.2.1 NAL-NL1	11
3.2.2 NAL-NL2	12
3.2.3 DSL[i/o]	13
3.2.4 DSLv5.0	14
3.2.5 HSE	15
3.3頻道數	16
3.4壓縮參數之效益	17
4 研究目的	19
5 論文架構      20
第二章 語音放大補償策略的介紹	21
1 NAL-NL1語音放大補償策略	21
1.1響度模組 (Loudness Module)	22
1.2語音理解指標模組( Speech Intelligibility Index Module)	29
2 DSL[i/o]語音放大補償策略	33
3 HSE語音放大補償策略	37
3.1頻帶切割模組	39
3.2響度與增益補償模組	40
3.3 壓縮模組	43
第三章 助聽器體驗平台的選配與實現	45
1 測試語料	45
2測試增益	48
2.1 NAL-NL1測試增益	48
2.2 DSL[i/o] 測試增益	50
2.3 HSE測試增益	51
3 實際測試不同語音補償策略的增益	52
4助聽器體驗平台介面	54
第四章 實驗結果與討論	58
1語音補償結果	58
1.1  NAL-NL1增益結果	58
1.2  DSL[i/o]增益結果	61
1.3  HSE增益結果	64
1.4 三種模擬語音增益與實際量測增益之比較	68
1.5 增益補償至經GN Resound噪音消除後的語料之比較	71
2 討論	75
2.1 三種模擬增益與文獻增益之差異討論	75
2.2  噪音消除後的語音補償比較77
2.3實際測試不同語音補償策略的增益	77
2.4語音補償策略之效益	82
2.5 HSE響度模型之討論	83
第五章 結論與未來展望	87
1結論	87
2未來展望	88
參考文獻	90

                                

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