Beamforming Design of Microphone array
| Autor: | Ji-hong Wang, 王基鴻 |
|---|---|
| Rok vydání: | 2012 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 100 This thesis investigates the signal processing of a microphone array when the arrangement of the microphones is a uniform linear array (ULA) or a uniform circular array (UCA), designing an implementation of a microphone-array beamforming. In real world environment, the speech signal received by a set of microphones contains the desired signal, interference, and ambient noise. In order to enhance the desired signal and reduce other signal, the algorithm, linearly constrained minimum variance (LCMV), is used. By estimating the channel attenuation factor between the source signal and each microphone, one can adjust the gain of the circuit to decline the difference between microphones. After that, the estimate of direction of arrival (DOA) from the spatial information of the microphone-array signal, the time difference of arrival (TDOA) between microphones due to the direction of source is obtained. Finally, by designing a microphone-array circuit to receive the voice signal, this study verifies the beamforming system in a noisy speech environment, and then discusses the difference between the signals received by a set of ULA and UCA. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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