| 摘要 |
PURPOSE:To obtain a stable mutual induction communication line with high quality while excluding the effect of external induction disturbing wave by using >=2 sets of crossing type parallel two-wire induction lines and constituting the inducing lines so that the cross points are not overlapped together. CONSTITUTION:Crossing parallel two induction wires 1, 2, 3 installed in parallel with a running road for mutual communication between a ground station and a mobile body are crossed respectively at pitches P1, P2 and P3, the crossing positions are provided shiftedly so as not to be coincident with each other and termination resistors 4, 5, 6 are connected respectively. A mobile body 17 uses a voice signal from a handset 26 so as to modulate a carrier having a frequency f1 at a transmission section 18 and transmits the result via a loop antenna 22. When the mobile body 17 passes near a point A, the antenna 22 is coupled effectively to the inductive lines 1, 2 but not coupled with the inductive line 3, the signal induced in the inductive lines 1, 2 is received (11,10) respectively by a fixed station 7, synthesized (14) and outputted from a speaker 14. When the mobile body 17 passes through points B, C, the body are coupled with the inductive lines 1, 3 and the inductive lines 2, 3 and excellent S/N is selected by a detection diversity reception. |
