论文部分内容阅读
介绍了一种以单片机为核心,通过公用电话网进行远程传输的智能语音报警系统.该系统用MITEL公司的DTMF收发器MT8880芯片作为电话双音多频信号的解码核心,用AT89C51单片机作主控器,报警信号以中断方式送单片机,无警情时单片机工作在空闲方式,降低了系统功耗;该系统使用公用电话网进行信息传输,采用C51进行编程.电路简单灵活、使用方便、防盗效果好.“,”A intelligent voice alarm system which employs single chip as core and transmits by public telephone network is introduced. The system uses MT8880 chip of DTMF transceiver produced by MITEL Co. as decoder core of telephone DTMF signal and makes use of AT89C51 single chip as master controller. The alarm signal is sent to MCU by IRQ; It works in indle if no any input, so that saving power of the system; This system transmits the informations through the normal telephone network, and adopting C51 for programming.The results show that the circuit is brief, flexible, convenient and well effective anti-theft.