Railway switches and signals – Block-signal systems – Automatic
Patent
1975-05-08
1976-03-30
Blix, Trygve M.
Railway switches and signals
Block-signal systems
Automatic
246182C, B61L 2108
Patent
active
039469727
ABSTRACT:
This invention covers train cab signal equipment for receiving frequency modulated rail code signals which, when decoded, 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 circuit which prevents the signal supplied to the several code frequency responsive networks in the decoder unit from exceeding a predetermined maximum value in order to assure a welldefined 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 frequency 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.
REFERENCES:
patent: 3868075 (1975-02-01), Blazek
Blix Trygve M.
Eisenzopf Reinhard J.
McIntire, Jr. R. W.
Westinghouse Air Brake Company
LandOfFree
Simplified cab signal receiver circuit does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Simplified cab signal receiver circuit, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Simplified cab signal receiver circuit will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-516709