| 摘要 |
<P>PROBLEM TO BE SOLVED: To automate input/output gain regulating work in a transmitter and a receiver, and to enhance reliability of a track circuit device, in the track circuit device. <P>SOLUTION: A signal level received by an on-board device 71 is kept constant, by controlling a soft attenuator 42 of the transmitter 40 to bring a current value into a value allowed in the on-board device 71, referring to the current value flowing in the vicinity of a reception point of a track circuit 0 measured conventionally as the purpose of detecting a foreign matter, by a monitor receiver 60. Further, a train is restrained from being detected incorrectly by fluctuation of a reception level caused by fluctuation of a weather or the like, by regulating a variation of a transmission gain of the transmitter 40, and an input gain of a soft attenuator 52 of the receiver 50. <P>COPYRIGHT: (C)2012,JPO&INPIT |
