Communications: electrical – Condition responsive indicating system – With particular system function
Patent
1993-07-14
1996-02-27
Peng, John K.
Communications: electrical
Condition responsive indicating system
With particular system function
340518, 364138, 364140, G08B 2900
Patent
active
054952280
ABSTRACT:
A fail-safe scan circuit sequentially and periodically drives and scans objective devices. The scan circuit has a failure detector that provides, upon detecting a failure, a signal of logical value 0 to inform of the failure. Adjacent input signals to the failure detector have a phase difference of .pi.. This phase difference results in simplifying the structure of the failure detector. The fail-safe scan circuit is employable to drive and scan many photosensors of a fail-safe multibeam sensor.
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Futsuhara Koichi
Kato Masakazu
Peng John K.
The Nippon Signal Co. Ltd.
Wu Daniel J.
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