为此，作者通过引入自适应理论来实现铁道信号中噪音的对消。
So the adaptive theory has been introduce to realize the noise signal cancelling.
本文以铁道信号电源为背景，研究了一种单极性调制的逆变电源。
Based on the power supply for railway signal system, this dissertation investigates an inverter controlled by the strategy of unipolar modulation.
铁道部的相关规定实际上禁止外国公司竞标信号合同。
Ministry of Railways rules effectively forbid foreign companies from bidding.
此方法从干扰源处——接触网与受电弓之间馈入高频信号，由电气化铁道系统辐射出去进行测量。
According to the measurement method, feeding a rf sinusoidal signal at location of interference source, so this signal is radiated by electrified railway system.
本实用新型主要用于铁道机车车辆空气制动机输送压缩空气和传递制动操作信号。
The utility model is mainly used in the railway locomotives air brakes to transport compressed air and transfer the brake operation signal.
定期在线检测电气化铁道轨道电路参数，可确保信号设备工作在最佳状态，避免行车事故。
The electric parameters of rail circuit must be measured periodically to check if the signal system is in good condition and to avoid accident.
交通信号灯采用红、黄、绿三种颜色，是因为早期的交通指挥官模仿铁路工程师所设计的用于铁道系统控制火车的编码系统。
Stoplights are red, yellow, and green, because traffic officials, early on copied the code system railroad engineers devised for track systems controlling the trains.
由于铁道机车信号中噪音信号频率与调频信号频率较为接近，使用普通滤波器很难在滤除噪音时尽可能少地影响有用信号。
It is difficult to reduce the noise signal in the cab signal by normal filter because the frequency of it is similar to themodulate signal.
由于铁道机车信号中噪音信号频率与调频信号频率较为接近，使用普通滤波器很难在滤除噪音时尽可能少地影响有用信号。
It is difficult to reduce the noise signal in the cab signal by normal filter because the frequency of it is similar to themodulate signal.
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