Railway switches and signals – Block-signal systems – Automatic
Patent
1984-01-13
1986-04-15
Reeves, Robert B.
Railway switches and signals
Block-signal systems
Automatic
246122R, 328120, 34082564, 340933, B61L 2100
Patent
active
045822794
ABSTRACT:
A modulation system for railway track circuits in which a modulated signal is applied to a section of track for the purpose of detecting the presence or absence of a train on the section. Such circuits are used to control signalling and they are vital to safe operation of a railway. At a transmitter end, the output (19) of a power amplifier (18) is connected to a section of track. The power amplifier (18) receives the modulated signal from a modulator (17) which is itself controlled by a pseudorandom binary sequence generator comprising a clock (11), a shift register (10), and a modulo 2 adding circuit (13, 14, 15). Equivalent circuitry is used at a receiver end to recognize the pseudorandom sequence in the absence of a train on a given section of track. The likelihood of interference from a train on that section generating an interference signal capable of being mistakenly recognized for the absence of a train can be reduced to an arbitrarily low value.
REFERENCES:
patent: 2515868 (1950-07-01), Gilson
patent: 3399351 (1968-08-01), Reszka
patent: 3562712 (1971-02-01), Thorne-Booth et al.
patent: 3757112 (1973-09-01), Lehman
patent: 3902161 (1975-08-01), Kiowski et al.
patent: 3958781 (1976-05-01), Woods et al.
patent: 4320881 (1982-03-01), Campbell
Alsthom-Atlantique
Reeves Robert B.
Wacyra Edward M.
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