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Student Number 985201092
Author Meng-ju Wu(吳孟儒)
Author's Email Address No Public.
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Department Electrical Engineering
Year 2010
Semester 2
Degree Master
Type of Document Master's Thesis
Language zh-TW.Big5 Chinese
Title Design and Implementation of
Adaptive Microphone-Array Beamforming
Date of Defense 2010-07-15
Page Count 91
Keyword
  • beamforming
  • channel attenuation from factors
  • direction of arrival (DOA)
  • Linearly constrained minimum variance (LCMV)
  • microphone-array
  • multichannel cross-correlation coefficient (MCCC
  • spatial filter
  • Abstract This thesis investigates the signal processing of a uniform linear microphone array to design and implement an adaptive microphone-array beamforming. In practical world environments, the signal captured by a set of microphones in a speech communication system is a signal mixed with the desired signal, interference, and ambient noise. A promising solution of proper speech acquisition with reduced noise and interference in this context consists in using the linearly constrained minimum variance (LCMV) beamformining to reject the interference, reduce the overall mixture energy, and preserve the target signal. This approach requires such knowledge as the direction of arrival (DOA); therefore an estimator based on the multichannel cross correlation coefficient (MCCC) is also used. In addition, an eigenanalysis of the parameterized spatial correlation matrix is performed and reveals that such analysis allows one to estimate the channel attenuation from factors such as uncalibrated microphones. This estimate generalizes the broadband minimum variance spatial spectral estimator to more general signal models. Finally, experimental results show that the developed microphone array amplifier circuit and accompanied with signal processing algorithms successfully improve the target signal in the noisy environment.
    Table of Content 摘要...........................................I
    Abstract......................................II
    目錄..........................................IV
    圖目錄........................................VI
    表目錄.......................................XII
    第一章緒論.....................................1
    1.1 研究動機...................................1
    1.2 研究目標...................................3
    1.3論文架構....................................4
    第二章空間濾波器...............................5
    2.1 空間濾波器簡介.............................5
    2.2 延遲相加空間濾波器.........................6
    2.3 空間響應...................................9
    第三章適應性濾波..............................15
    3.1適應性濾波器簡介...........................15
    3.2 線性限制最小變異空間濾波器................16
    3.3 線性限制最小變異濾波器之模擬..............22
    3.4傳遞衰減係數估測...........................27
    第四章信號到達方向估測........................29
    4.1 基本介紹..................................29
    4.2聲音訊號模型...............................30
    4.3向前空間線性預估法.........................36
    第五章實驗與討論..............................42
    5.1 系統架構設計..............................42
    5.2 實驗評量方法..............................45
    5.3 實驗平台..................................50
    5.4 實驗結果與討論............................56
    第六章結論與未來展望..........................73
    參考文獻......................................74
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    Advisor
  • Kuo-kai Shyu(徐國鎧)
  • Files
  • 985201092.pdf
  • approve in 3 years
    Date of Submission 2011-08-02

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