SOPC Implementation of Speech Purification and Voice Activity Detection System Using Microphone Array

• Main Authors: Yan-Jung Hsuei, 許晏榮
• Other Authors: Jwu-Sheng Hu
• Format: Others
• Language: zh-TW
• Published: 2005
• Online Access: http://ndltd.ncl.edu.tw/handle/mkjwd4

碩士 === 國立交通大學 === 電機與控制工程系所 === 94 === A real-time speech purification and voice activity detection (VAD) system for noisy indoor environment is proposed in this thesis. The system contains a real-time eight channel microphone array signal processing platform. An adaptive spatial filter is also designed on the platform to provide the system with the ability of environmental characteristic and noise adaptation. All the algorithms are realized on a Nios embedded system-on-programmable-chip (SOPC) platform. The VAD algorithm is executed by the Nios processor and the adaptive filter is accelerated by a self-designed hardware, which is a customized peripheral. The communication between the Nios and processor and the customized peripheral is achieved by the Avalon Bus. Since the order of the spatial filter is flexible, the system can be adjusted for superior speech puirificaiton result. The experimental results verify that the system can suppress the effect of environmental noise and improve the SNR effectively.