Signal checking system
AssigneesHitachi, Ltd., Japanese National Railways
InventorsSeiichi Yasumoto, Kazuhiko Kobayashi, Isao Yasuda, Ken Itoh
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Abstract
A signal checking system for use in a hardware system having a converter for converting coded input signals consisting of a plurality of bits into corresponding individual signals, wherein undesirable selection of an erroneous output and multiple outputs by the converter is detected by means adapted for checking the relation between the input to the converter and the output of a first coder connected to the converter and checking the complementary relation between the output of the first coder and the output of a second coder connected to the converter.
Claims6
A signal checking system comprising a returning signal coder to which a plurality of individual single signals are applied in a first order to be converted into corresponding scale-of-N coded output signals (N .gtoreq. 2), a checking coder to which said same individual single signals are applied in a second or reverse order to be converted into corresponding scale-of-N coded output signals, and a complement checking circuit for checking the complementary relation between the output of said returning signal coder and the output of said checking coder.
Dependencies are inferred from the claim text.