B - Operations – Transporting – 61 – L
Patent
B - Operations, Transporting
61
L
346/16, 346/63
B61L 3/20 (2006.01) B61L 3/24 (2006.01)
Patent
CA 1046619
ABSTRACT OF THE DISCLOSURE There is disclosed an input signal threshold responsive apparatus for responding to a predetermined input signal energy level, in relation to a voltage and time product, before an associated train vehicle control system is enabled by a provided gated enable signal. The provided apparatus responds to one of a plurality of input signals, having respectively different frequencies and different amplitudes, and provides an enabling output signal. It is desired to provide an improved threshold sensitive input signal receiver apparatus in conjunction with train vehicle control and in relation to plural stray signals in a given track circuit signal block due to cross talk from adjacent signal blocks and the like. The input signal responsive or sensitivity threshold is established in relation to the practical required signal level of the desired signal to be received within the given signal block. The present signal responsive apparatus is operative in conjunction with a train vehicle carried speed coded sig- nal for controlling the speed of the train vehicle along a provided track.
249213
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