关键词: 双门限检测, 语音端点检测, MATLAB工具箱, 现场可编程门阵列

Abstract: This paper properly improves the effective voice messages’ criterion of a Voice Active Detection（VAD） algorithm，which is based on short-term energy feature and short-time zero-crossing rate.MATLAB simulation shows the validity of the improved algorithm.Furthermore，this paper puts forward a circuit solution on the VAD algorithm，which needs less hardware resources than previous algorithm.ModelSim simulation result proves that the design has a good real-time ability and can give the effective voice endpoint in 4 cycles after one frame of voice information has been collected.At last，the FPGA testing platform is introduced，which further testifies the design.

Key words: double threshold detection, Voice Active Detection（VAD）, MATLAB, Field Programmable Gate Array（FPGA）