专利名称：Method of and apparatus for operating a
security system to produce an alarm signal
发明人：David A. Bruno申请号：US08/221025申请日：19940330公开号：US05428345A公开日：19950627
摘要：A security system (10), operable to produce an ALARM signal indicative of glassbreakage in a region (16) in which a human being (24) may legitimately be present, has ahuman presence detector (12), a glass breakage detector (14), and an alarm signalactivator (30) that includes a one-shot timer (52). A HUMAN PRESENCE DETECT signal (36,38) output from the human presence detector triggers or retriggers the timer toproduce an active output for a predetermined holdoff time interval T.sub. H. The activeoutput causes a gate (58) to prevent a glass breakage alarm or GB DETECT pulse (46)from the glass breakage detector from reaching a control panel (34) and thus fromtriggering the ALARM signal if the GB DETECT signal occurs within the holdoff timeinterval after a HUMAN PRESENCE DETECT signal. Another gate (64) prevents a GBDETECT pulse (48) from reaching the control panel if that pulse occurs while the humanpresence detector is detecting human presence in the region (38). A GB DETECT signal(44, 50) that occurs at any other time reaches the control panel and triggers the ALARMsignal (86, 88). The system may also activate a service or illumination unit (90) to provide aservice or illumination to the region following a HUMAN PRESENCE DETECT state or maytrigger a HUMAN PRESENCE ALARM pulse (100) when a HUMAN PRESENCE DETECT state
arises when a REGION UNOCCUPIED signal has been activated.
申请人：SENTROL, INC.
代理机构：Stoel Rivers Boley Jones & Grey
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