Fail-safe cab signal process for transmitting information by hig

Details Fail-safe cab signal process for transmitting information by hig Fail-safe cab signal process for transmitting information by hig

1976-09-28

1978-03-28

Kunin, Stephen G.

Railway switches and signals

Block-signal systems

Automatic

246167R, B61L 324

Patent

active

040811603

ABSTRACT:
A method and apparatus is provided for communicating information in the form of plural items of data between a first station and a rail vehicle by transmission of pulses at predetermined repetition rates along railway tracks including a transmitting station for generating the information pulses having control apparatus receiving a particular data item as an input for selecting a repetition rate to represent the data item for transmission and generating apparatus connected to the control apparatus for generating the information pulses. The information pulses are coupled to railway tracks which transmit the generated information. A receiving station receives the information pulses from the tracks and includes sensing apparatus for sensing the information pulses and apparatus for removing interference signals received along with the information pulses, the interference signals being attributable to a number of causes which include unbalanced traction return currents and/or transmission interference. The receiving station further includes apparatus for determining a repetition rate of the received pulses and apparatus for decoding information from the determined repetition rate thereby to determine the particular data item being transmitted. Finally, there is included apparatus for displaying the particular data item.

REFERENCES:
patent: 2692941 (1954-10-01), Sorensen
patent: 2811634 (1957-10-01), Hufnagel
patent: 3337727 (1967-08-01), Freeman
patent: 3885228 (1975-05-01), Katz et al.

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