【摘要】 利用声波传感器检测钢轨中远处传来的行车噪声波，经限幅放大，A／D转换，数字滤波处理，由单片机程序识别确认来车，实现智能报警．分析了波源特点，给出了硬件结构及软件主程序框图．更多还原

【Abstract】 This system uses sound wave sensor to detect the running train’s noise wave after that conveys through the steel track. lt is amplified through process of restrict marpin, thensformed with A/D and treated with digit filter The signal is distinguished by a single chip processo/s procedure. When the signal of coming train is confirmed, the alarm sound is given out automatically The charateristic of the noise wave source is analyzed.Structure of the hardware and scheme of software are reported.更多还原