ELECTRIC SIGNALING INSTALLATION COMPRISING AT LEAST ONE TRANSMITTER AND ONE RECEIVER

摘要

The signalling installation comprises at least one transmitter (A) and one receiver (B), arranged on the same electric network (C). The transmitter (A) comprises an oscillator (6) modulated by two tuning forks (4 and 5) and provides a signal during a duration of for example 10 seconds, determined by a time delay device (2). The receiver (B) comprises a demodulator (14), followed by two filters (15 and 16) connected to integrators (17 and 18). As soon as the integrated signals reach a predetermined value, a signal is emitted at the output (20). The installation is substantially unsensitive to parasitic noises of the network and operates perfectly with very low signals.