Method of and apparatus for operating a security system to produce an alarm signal
US5428345A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 30, 1994 |
| Grant date | Jun 27, 1995 |
| Priority date | — |
| Expiry date | Mar 30, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08B13/04
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A security system (10), operable to produce an ALARM signal indicative of glass breakage in a region (16) in which a human being (24) may legitimately be present, has a human presence detector (12), a glass breakage detector (14), and an alarm signal activator (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 to produce an active output for a predetermined holdoff time interval T.sub.H. The active output 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 from triggering the ALARM signal if the GB DETECT signal occurs within the holdoff time interval after a HUMAN PRESENCE DETECT signal. Another gate (64) prevents a GB DETECT pulse (48) from reaching the control panel if that pulse occurs while the human presence 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 ALARM signal (86, 88). The system may also activate a service or illumination unit (90) to provide a service or …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.