Railway switches and signals – Cab signal or train control – Magnetic rail
Patent
1994-09-26
1996-01-23
Le, Mark T.
Railway switches and signals
Cab signal or train control
Magnetic rail
246 1C, 246 34B, B61L 2700
Patent
active
054859778
ABSTRACT:
A signaling apparatus that includes a transmitter having a step-square wave generator for generating a signaling waveform, which waveform is composed of a plurality of square wave signals, and which has an information signal encoded thereupon. The apparatus may also include a signaling waveform receiver, disposed on the railcar, and an information signal decoder, connected to the receiver, for extracting the information signal from the receiver. The stepped-square wave generator produces square waves such that a portion of the duty cycle of one of a plurality of square wave signals overlaps at least a portion of the duty cycle of at least one other of the plurality of square wave signals. A method for signaling in which a multi-stepped square waveform is generated, includes a waveform having a series of superimposed square waves, each of which having preselected amplitudes and duty cycles. An information signal can be encoded upon the multi-stepped carrier waveform such that a coded-carrier signal is created.
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Bozio Robert P.
Brown James P.
Le Mark T.
O'Rourke John F.
Union Switch & Signal Inc.
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