| 摘要 |
<p>Method of working and arrangement for monitoring (1) a room with a view to delivering alarm signals (B) in the event of an intrusion, comprising at least one group of detection circuits (2a...2n) adapted to deliver, when a detection occurs, intrusion signals to an alarm circuit (3), the latter being adapted to deliver alarm signals. The alarm circuit (3) delivers an alarm signal (B) after successive receptions of at least two intrusion signals separated by at most a specified delay (t). After an intrusion signal is delivered to the alarm circuit by any one of the detection circuits, any new intrusion signal which might be delivered by this detection circuit during the abovementioned delay (t) is inhibited or blocked. <IMAGE></p> |
