Dynamic information storage or retrieval – Condition indicating – monitoring – or testing – Including radiation storage or retrieval
Patent
1989-12-21
1991-10-15
Canney, Vincent P.
Dynamic information storage or retrieval
Condition indicating, monitoring, or testing
Including radiation storage or retrieval
369 59, G11B 700
Patent
active
050580930
ABSTRACT:
A signal level deviation detecting apparatus for detecting an amplitude deviation of an alternating signal is disclosed. This apparatus comprises: at least two waveform shaping circuit shaving different threshold values for converting an input alternating signal into at least two rectangular waveform signals; a pulse conversion circuit for converting the rectangular waveform signals into at least two pulse signals logic states which change in a first specific circulation pattern when the input alternating signal maintains its normal amplitude, wherein the pulse conversion circuit is adapted to cause a change from the first specific circulation pattern to a second specific circulation pattern when the amplitude of the input alternating signal is deviated to such an extent that one of the rectangular waveform signals disappears; and a state transition discrimination circuit which receives the at least two pulse signals and inverts its output logic state in response to a change between first and second specific circulation patterns to thereby produce a signal level deviation detected signal indicative of the amplitude deviation of the input alternating signal.
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patent: 4308612 (1981-12-01), Miyauchi et al.
patent: 4685098 (1987-08-01), Yoshida
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patent: 4719612 (1988-01-01), Kenjyo
Canney Vincent P.
Matsushita Electric - Industrial Co., Ltd.
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