Title page for 965201100


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Student Number 965201100
Author Shih-jie Kuo(郭世傑)
Author's Email Address No Public.
Statistics This thesis had been viewed 443 times. Download 292 times.
Department Electrical Engineering
Year 2010
Semester 2
Degree Master
Type of Document Master's Thesis
Language zh-TW.Big5 Chinese
Title Development of a Software-Based Simulation Platform for Hearing Aid –Dual Microphone For Stationary and Non-stationary Noise Reduction
Date of Defense 2011-07-29
Page Count 132
Keyword
  • Hearing Aid
  • Microphone Mode
  • Noise Reduction
  • Simulation
  • Abstract The purpose of this research was to develop a software-based simulation platform for hearing aid. This study simulated dual-microphone processing strategy in hearing aid to reduce stationary and non-stationary background noise. In this study, microphone processing strategies from three different hearing aid companies were simulated based on the patent or literature search of GN ReSound® Canta (Bloomington, MN, USA), Widex® Senso Diva (Lynge, Denmark), and Philips to provide users to experience different hearing aid company's strategies. In these strategies, the main methods of noise reduction were based on adaptive algorithms to update the gain and filter weight to reduce the power of the noise. According to subjective quality evaluation (waveform, spectrogram, listening) as well as objective quality evaluation (average SNR, polar plot), the effect of the microphone strategy was assessed. In the subjective evaluation, we found that the speech waveforms and formant frequencies of the speech spectrograms become clearer and the voice quality was better. Besides, the objective assessment showed that four kinds of microphone processing strategies have effectively enhanced the recorded microphone signals with signal to noise ratio of 8.5 to 11.5 dB. Therefore, with addition of these microphone processing strategies to the software-based simulation platform for hearing aid, we provide a better assistive tool for the clinician and hearing impaired to experience hearing aid function and to choose appropriate hearing aid.
    Table of Content 摘要..................................................I
    Abstract..............................................II
    致謝..................................................IV
    目錄..................................................V
    圖目錄................................................VIII
    表目錄................................................XIII
    第一章 緒論..........................................1
    1.1 研究動機..........................................1
    1.2 助聽器介紹........................................3
    1.3方向性麥克風及其應用...............................5
    1.4 相關研究與文獻探討................................11
    1.5 研究目標..........................................17
    1.6 論文內容架構......................................18
    第二章 麥克風策略方法................................19
    2.1 Fa Long Luo麥克風策略-GN ReSound助聽器............20
    2.2 Lars Baekgard Jensen麥克風策略-Widex助聽器........29
    2.3 Jeff Vanden Berghe之麥克風策略-Philips助聽器......34
    2.4 Jeff Vandan Berghe麥克風策略-GN ReSound(DO)助聽器.37
    第三章 助聽器模擬平台以及實驗方法....................41
    3.1 實驗流程以及平台架構..............................41
    3.2 實驗方法..........................................43
    3.3 麥克風策略之極向圖量測方法........................48
    3.4 麥克風策略評量方法................................50
    3.5 助聽器模擬平台介面................................52
    第四章 實驗結果.......................................56
    4.1 麥克風策略結果主觀評量............................56
    4.1.1 單固定噪音源....................................56
    4.1.2 多重固定噪音源..................................65
    4.1.3 移動式噪音源.....................................72
    4.2 麥克風策略結果客觀評量............................76
    4.2.1 訊噪比改善值.....................................76
    4.2.2 策略極向圖量測結果..............................81
    第五章 討論...........................................86
    5.1 高背景噪音之麥克風策略............................86
    5.2 麥克風策略對於噪音源種類和角度的比較..............88
    5.3 Oticon麥克風策略與本研究四種策略做比較............90
    5.4 麥克風策略後再結合噪音消除策略以及WDRC放大........92
    5.5 相對噪音方向角度之增益與能量關係..................97
    5.6 適應性收斂係數λ...................................98
    5.7 麥克風模式........................................103
    5.8 麥克風極向圖......................................104
    第六章 結論與未來展望.................................110
    6.1 結論..............................................110
    6.2 未來展望..........................................111
    參考文獻..............................................113
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    Advisor
  • Chao-min Wu(吳炤民)
  • Files
  • 965201100.pdf
  • approve in 2 years
    Date of Submission 2011-08-26

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