A sound warning device is designed, and the device has following functions: (1) The alarm is given when smoke and gas exceed the provided standard, and at the same time the system of safety is used automatically. (2) The approaching of human body is warne
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文川.基于8751的语音报警服务系统[J].重庆工商大学学报(自然科学版),2003,(1): WEN Chuan. A service system of sound warning based on 8751[J]. Journal of Chongqing Technology and Business University(Natural Science Edition),2003,(1):