B - Operations – Transporting – 61 – L
Patent
B - Operations, Transporting
61
L
346/63
B61L 3/16 (2006.01) B61L 3/00 (2006.01)
Patent
CA 1055592
SIMPLIFIED CAB SIGNAL RECEIVER CIRCUIT ABSTRACT OF THE DISCLOSURE This invention covers train cab signal equipment for re- ceiving frequency modulated rail code signals which, when de- coded, provide a zone speed control signal which the railway train traversing the track rail must obey in order to proceed at a safe speed. The invention includes a signal limiter cir- cuit which prevents the signal supplied to the several code frequency responsive networks in the decoder unit from exceed- ing a predetermined maximum value in order to assure a well- defined frequency bandwidth to which respective code filters in the frequency responsive networks are sensitive, so that only a single network is responsive to any given code signal. In addition, the limiter circuit supplies the respective fre- quency responsive networks with a code signal whose amplitude is proportional to rail current so long as the code signal is below the maximum level set by the limiter. This permits a level detector associated with each code filter to monitor the code signal received for minimum level detection in order to assure that the rail current code signal is a valid code signal.
249191
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