Self-protection device for surveillance lines

The system uses a modulated power supply 3 controlled by a clock 4. In normal operation, the voltage VA at point A varies around the latch voltage of a logic element 5. This logic element then delivers a signal which is alternately a 1 or a 0, at each of the clock pulses. This signal is next picked...

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Bibliographic Details
Main Author DANIEL CYPRYS, EMMANUEL BLATTES ET HERVE CARRIERE
Format Patent
LanguageEnglish
French
Published 21.08.1987
Edition4
Subjects
ALARM SYSTEMS
ORDER TELEGRAPHS
PHYSICS
SIGNALLING
SIGNALLING OR CALLING SYSTEMS
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