| 摘要 |
The individual protection system for underground car parks comprises an encoded microtransmitter HF1 whose transmission time is limited in time. This transmission is received by a position receiver 2 delimiting a precise geographical area in the car park. This receiver triggers a synthesised frequency which is injected at 3 into the coaxial cable network. This frequency is extracted by a demultiplexer 5 in the central unit and processed by a demodulator 6 which closes a contact TOR for signalling on a display board 8. In parallel, a signal BF is applied to a loud speaker 7. The set of receivers is remotely powered by a power supply 10 injected at 9 into the coaxial network. <IMAGE>
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