Multi-channel signal decoder

Details Multi-channel signal decoder Multi-channel signal decoder

1975-03-13

1977-03-29

Safourek, Benedict V.

Telegraphy

Systems

Alternating or pulsating current

340171PF, H04L 2714

Patent

active

040150828

ABSTRACT:
A signal decoder is disclosed for use in a transportation vehicle control system in which vehicle control signal information bits are transmitted according to a multiple message frequency, FM, PSK, or FSK, comma-free binary coded command signal. The disclosed invention uses selective receiver channels for each command signal message frequency to detect information bits according to the selected message frequency. The detected information bits of each receiver channel are separately stored to comprise a separate information history for each message frequency and these information bit histories are then individually decoded. The decoded signals are compared to detect a discrepancy between any of the decoded signals due to component failures, signalling system noise, or component transient conditions. For any discrepancy between the decoded signals, a fail-safe comparator reduces the decoded signal to a more safe condition.

REFERENCES:
patent: 3179748 (1965-04-01), Farrow
patent: 3882545 (1975-05-01), Titus

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