B - Operations – Transporting – 61 – L
Patent
B - Operations, Transporting
61
L
346/32
B61L 3/10 (2006.01) B61L 3/24 (2006.01) B61L 23/16 (2006.01)
Patent
CA 1162631
AUDIO FREQUENCY TRACK CIRCUIT FOR RAPID TRANSIT APPLICATIONS WITH SIGNAL MODULATION SECURITY Abstract of the Disclosure An audio frequency track circuit with improved security in the train detection function for rapid transit applications for use with uninsulated rails in- cludes an improved transmitter and receiver. The trans- mitter modulates a track frequency carrier with a fixed code rate, regardless of the code rate employed to modu- late the train information frequency. The receiver in- cludes a decoder tuned to the track frequency modula- tion rate. By using such a sharply tuned decoder, the noise protection threshold is increased. Because of its application to uninsulated rails, with the associated lack of hard track circuit boundaries, adjacent track circuits have different track frequency modulation rates to insure that the modulated track frequency sig- nal, from one track circuit, is not effective to operate a track relay in another circuit even under failure conditions.
374568
Hoelscher James R.
Smith Barry L.
Borden Ladner Gervais Llp
General Signal Corporation
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