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）

摘要： 在基于短时能量和短时过零率的双门限语音端点检测算法基础上，改进其有效语音的判断条件，采用MATLAB工具分析了改进算法的有效性。提出了基于改进算法的语音端点检测电路的设计，该设计减少了实现语音端点检测电路对硬件资源的需求。ModelSim仿真验证表明，改进后的算法有较好的实时性，在采集完一帧语音数据后第4拍给出语音有效信号。最后给出该语音检测电路的FPGA验证平台。

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