Fail-safe cab signal process for transmitting information by high-voltage pulsed track circuits, and apparatus for carrying the process into effect
First Claim
1. A method for communicating information comprising a plurality of data items to a rail vehicle by transmission of pulses at predetermined repetition rates along railway tracks comprising the steps of:
- a) encoding each of said data items as pulses occurring at a selected repetition rate;
b) transmitting said pulses at said selected repetition rate along said tracks;
c) receiving said pulses;
d) removing interference signals from said pulses, said interference signals attributable to a number of causes, which include;
i) unbalanced traction return currents, and/orii) transmission interferences;
e) regenerating said received pulses;
f) determining the repetition rate of said received pulses;
g) decoding information from said determined repetition rate, andh) indicating the decoded information in said rail vehicle.
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Accused Products
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.
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Citations
25 Claims
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1. A method for communicating information comprising a plurality of data items to a rail vehicle by transmission of pulses at predetermined repetition rates along railway tracks comprising the steps of:
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a) encoding each of said data items as pulses occurring at a selected repetition rate; b) transmitting said pulses at said selected repetition rate along said tracks; c) receiving said pulses; d) removing interference signals from said pulses, said interference signals attributable to a number of causes, which include; i) unbalanced traction return currents, and/or ii) transmission interferences; e) regenerating said received pulses; f) determining the repetition rate of said received pulses; g) decoding information from said determined repetition rate, and h) indicating the decoded information in said rail vehicle. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. An apparatus for communicating information comprising plural items of data between a first station and a rail vehicle by transmission of pulses at predetermined repetition rates along railway tracks comprising:
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a. a transmitting station for generating information pulses for transmission, comprising; 1. control means receiving a particular data item as an input for selecting a repetition rate to represent said particular data item for transmission, and 2. generating means connected to said control means for generating said information pulses; b. railway tracks for transmitting said generated information pulses thereon; c. coupling means for coupling said information pulses to said tracks; d. a receiving station receiving said information pulses from said tracks, comprising; 1. sensing means for sensing said information pulses from said tracks, 2. means for removing interference signals received along with said information pulses from said tracks, said interference signals attributable to a number of causes which include; i. unbalanced traction return currents, and/or ii. transmission interferences 3. means connected to said removing means for determining a repetition rate of said received pulses, 4. means for decoding information from said determined repetition rate thereby to determine the particular data item transmitted, and 5. means for indicating said particular data item. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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Specification