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URN etd-0828105-002658 Statistics This thesis had been viewed 3629 times. Download 955 times. Author Chung-hao Peng Author's Email Address No Public. Department Computer Science and Enginerring Year 2005 Semester 2 Degree Master Type of Document Master's Thesis Language English Page Count 42 Title Location-Specified Signal Extraction from Multiple Sources Keyword Sound Extraction Microphone Array Computerized Tomography Computerized Tomography Microphone Array Sound Extraction Abstract Recently, microphone array technique has already been used in teleconference and distance education. Without modifying the hardware arrangement, the sound signal from the position we selected could be enhanced by microphone array. This paper presents a new method of extract sound signal, base on the Back-Projection method usually been used in Computerized Tomography (CT) technique.
The typical method to enhance signal, which comes from the focus location in multiple sources environment, is Delay-and-Sum technique which is base on the delay and shift operations. In the Computerized Tomography (CT) technique, the back-projection method usually been used to reconstruct the image signal. Taking the process of signal received by microphone is a kind of non-straight projection. Therefore, the back-projection method could be used to reconstruct the sound signal. The system is simulated by matlab and a non-reverberant conference room is performed. Microphone array are arranged with equal distance alone one wall. First, simple sin wave is used to verify the extraction efficiency. Then, we change the position of two sources and the microphone array size. The result shows the back-projection method could extract the sound, which comes from the source we specified
Advisor Committee Chia-Ming Chang - advisor
Chin-Tzuen Chang - co-chair
Tsang-Long Pao - co-chair
Files Date of Defense 2005-07-20 Date of Submission 2005-08-28