| 摘要 |
PURPOSE:To obtain a simple car information transmitter which transmits information from the car to ground, by transmitting the frequency different from the normal oscillation frequency of an oscillator on the car to a loop antenna installed on ground via an antenna on the car. CONSTITUTION:When the car signal is required to be fed on ground through the stop of a train in case of an automatic train stop ATS and automatic train operation ATC, if the operating relay IR is closed with the condition of the operation of the car stop detection relay, carriers fc and signals fs are respectively input from the carrier oscillator 1 on the car and the signal oscillator 2 to modulate the signal fc with the signal fs. The modulation signal is amplified 4, flows to a coil 5 to draw the oscillation frequency fo of the oscillator 6 on the car via a coil 9 into the frequency fc, and frequencies fo and fc are alternately oscillated according to the period of the signal fs and this is transmitted to the loop antenna on ground 12 from the antenna 10 on the car. The signal received at the antenna 12 is rejected for the frequency fo at a BPF13, and it is demodulated 14 and fed to processing circuit, for information processing. |
