Vital rate decoder

Details Vital rate decoder Vital rate decoder

1988-11-04

1991-09-10

Heyman, John S.

Electrical pulse counters, pulse dividers, or shift registers: c

Applications

Measuring or testing

307265, 246 15, 377 55, 328112, 328119, 3644241, H03K 2102, B61L 2900

Patent

active

050480642

ABSTRACT:
A vital microcompressor-based rate decoder for use in a vital processing system in on-board main line railroad and rapid transit automatic train protection systems; the design is such that a method is incorporated for tolerating specific kinds of signal disruption and in such a way that the probability of a wrongside failure has a calculable upper bound. A pickup coil transmits external or wayside signals to an arrangement which involves two channels and which provides period and duty cycle measurement of the pulses resulting from demodulation of the external signals. A counter is employed in each of the channels and a tolerance accumulation rate decoding device is included, the maximum amount of tolerance accumulated, and the minimum time required to accumulate it, being functions of the rate code selected.

REFERENCES:
patent: 4254327 (1981-03-01), Beno et al.
patent: 4275354 (1981-06-01), Suematsu et al.
patent: 4469082 (1984-09-01), Nishitoba et al.
patent: 4475086 (1984-10-01), Allen
patent: 4726045 (1988-02-01), Caspell et al.
patent: 4805199 (1989-02-01), Muramatsu

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