列车即将到达进站信号机(站界标)处时称为列车接近。一般自动闭塞区间为列车压上第二接近轨道电路，半自动闭塞区间集中联锁车站为列车压上预告信号机或预告标处的轨道电路，非集中联锁车站为列车头部到达预告信号机或预告标处为列车接近。
... train annunciate 列车到发通告装置 train approach 列车接近 train approach advice 列车接近通告 ...
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介绍了JY型列车接近语言预警机的软、硬件设计和工作原理，并对其技术特点进行了分析。
This paper introduced the design purpose and working principle of Model JY Train Approaching Announciator and analyzed the features of the system.
以语音方式发出列车接近报警信息，通知桥梁或隧道中的工作人员注意和避让，保护人员和设备的安全。
Via speech sound, it was alarmed train approaching, noticed the men working in brige or tunnel to be careful and keep away fron track, protected the safety of men and device.
针对远方列车信号很小，且具有很强的噪声，直接通过时域分析误差较大，因此，采取频域分析方法，获取列车接近时的警报信号的规律，以用于便携式列车接近安全报警系统中。
So by means of the frequency-domain analysis, the character of alarming signal can be deduced and used in the system of portable safety alarming system of train approaching.
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