Improvement on Extracting and Modifying the Spatial Information in Audio

• Main Authors: Lin-Szu Yang, 楊琳思
• Other Authors: Chia-Ming Chang
• Format: Others
• Language: en_US
• Published: 2008
• Online Access: http://ndltd.ncl.edu.tw/handle/04153699034348200029

碩士 === 大同大學 === 資訊工程學系(所) === 96 === Recently, microphone array technique has already been used in teleconference and distance education. Accurate localization of multiple sound sources is indispensable for sound capture of microphone array. The sound signal from the position selected could also be enhanced. In this thesis, the method to extract the spatial information and sound sources from the received signal is proposed. The Cross-power Spectrum Phase (CSP) is used to nd the arrival time delay from sources to microphone. If two microphones are considered to locate at two foci, then the trajectory of the time delay found by microphone pair is a hyperbola. Treating a source location is a kind of projection. All of hyperbolas produced by microphone pairs have been collected. Therefore, the back-projection method could be used to reconstruct the source location. After all of the source locations are known, the sound projection is used to extract the sources one by one according the the spatial information. Finally, a sound eld would be synthesized. The result of the simulation veri es that the synthesized sound eld similar to original ones is synthesized. Furthermore, a new sound eld could also be synthesized according to the spatial information with requirement.