| 摘要 |
<p>PURPOSE:To transmit necessary information to a vehicle device without losing the function of the vehicle device by interrupting the transmission of a speed command signal for the prescribed period to transmit interrupt information, and allowing the vehicle device to receive the interrupt information, thereby delaying the recovery time of the speed information before the interruption. CONSTITUTION:In normal the state that no interrupt signal is presented, ATC signals f1, f2 transmitted from a ground device 2 to a signal transmission line 1 are received by a vehicle antenna 31. The received ATC signals f1, f2 are supplied to a main relay f1R or f2R through selecting amplifiers SA1, SA2. To interrupt the interrupt signal fx, the transmission of the ATC signal is interrupted for the prescribed period, and the signal fx is transmitted. When a main relay fxR is operated by the signal fx, the recovery of the main relays f1R, f2R is delayed by capacitors C1, C2. When the signal fx is not normally received, the relays f1R, f2R become inoperative state.</p> |
