| 摘要 |
The present invention relates to a control system for railroad color light signaling devices comprising: at least one central control station /4/; at least one peripheral station /7/; at least one electric cable /9/ interconnecting said central control station /4/ and said peripheral station /7/; and at least one signaling device /11/, cooperating with said peripheral station /11/. Said signaling device /11/ being provided with at least a first light source /13r/, capable of indicating, when on, a first condition for the advance of a railroad vehicle, and a second light source /13g/, capable of indicating, when on, a second condition for the advance of a railroad vehicle. The invention is characterized in that said central control station /4/ comprises signal generating means /18/, capable of generating a periodic alternating signal, delivered to said electric cable /9/. Said signal generating means /18/ being capable of alternatively generating, based on at least one remote control /D/, said signal with at least a first output frequency /F1/, or with a second output frequency /F3/. Said peripheral station /7/ comprises at least a first band-pass filter /31, 61/, capable of receiving the signal from said cable /9/, and supplying said first light source /l3r/. Said first band-pass filter /31, 61/ having a central frequency, which is substantially equivalent to said first output frequency /Fl/. Said peripheral station /7/ further comprises a second band-pass filter /33, 62/, capable of receiving the signal from said cable /9/, and supplying said second light source /13g/, whereby said second band-pass filter /33, 62/ has a central frequency, which is substantially equivalent to said second output frequency /F3/. |
