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1. 发明授权

US4516249A Railway signalling receiver 失效
标题翻译：铁路信令接收机
公开(公告)号：US4516249A
公开(公告)日：1985-05-07
申请号：US450459
申请日：1982-12-16
申请人： Andrew J. Cook , Paul D. Negus
发明人： Andrew J. Cook , Paul D. Negus
IPC分类号： B61L23/16 , G06F17/14 , H04L27/26 , H03D3/18
CPC分类号： G06F17/141 , B61L23/166 , H04L27/26
摘要： A railway signalling receiver in which a signal carried by the railway lines is sensed and the sensed signal is sampled, digitized and subjected to a discrete Fourier transform operation which transform the time domain samples into the frequency domain. The frequency content of the signal may then be examined in order to identify the original signal or to decode the information carried. The signal may be a frequency shift keyed carrier signal. A technique of maintaining the safety of the system by discriminating against potentially confusingly similar ASK signals, which can arise spontaneously in electric traction territories, is described. A technique of digitally heterodyning down a carrier signal so that the transform operates on the lower sidebands frequencies in order to maximize efficiency of the transform calculations is also described. The receiver is useful as a jointless track circuit receiver and also in a part of the train borne equipment of an automatic train protection system.
摘要翻译：一种铁路信令接收机，其中检测到由铁路线承载的信号，并且感测到的信号被采样，数字化并进行离散付里叶变换操作，其将时域采样转换成频域。然后可以检查信号的频率内容以便识别原始信号或对所携带的信息进行解码。信号可以是频移键控载波信号。描述了通过区分可能在电力牵引领域中自发产生的可能混淆的类似的ASK信号来维持系统的安全性的技术。还描述了一种对载波信号进行数字外差的技术，使得变换在较低边带频率上操作，以最大化变换计算的效率。接收器可用作无缝轨道电路接收器，也可用作自动列车保护系统的列车装备的一部分。

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