EP 3493169 A1 20190605 - ANTI-MASK FUNCTIONALITY FOR ACOUSTIC GLASS-BREAK DETECTORS
Title (en)
ANTI-MASK FUNCTIONALITY FOR ACOUSTIC GLASS-BREAK DETECTORS
Title (de)
ANTIMASKENFUNKTIONALITÄT FÜR AKUSTISCHE GLASBRUCHDETEKTOREN
Title (fr)
FONCTIONNALITÉ ANTI-MASQUE POUR DÉTECTEURS DE BRIS DE VERRE ACOUSTIQUE
Publication
Application
Priority
EP 17204945 A 20171201
Abstract (en)
The present invention provides an acoustic glass-break detector having anti-masking functionality comprising:i) a first and a second microphone for capturing acoustic energy and converting it into a first electrical signal, the second microphone is an omnidirectional microphone for capturing acoustic energy and converting it into a second electrical signal; the detector further comprising;ii) conditioning circuitry to convert the first and second electrical signals into a form suitable to be captured by an analog to digital converter; andii) a digital signal processor for capturing and analyzing the first and second conditioned electrical signals;wherein the digital signal processor is configured to:a) capture the first and second conditioned electrical signals characterized in that the apparatus is configured to perform the capture and analysis periodically and compare the signals and if:A) the signals have a differential greater than a threshold to trigger a masking alarm;B) the signals have a differential less than or equal to a threshold to continue operation.The present invention is best illustrated by figure 3.
IPC 8 full level
G08B 13/04 (2006.01); G08B 13/16 (2006.01); G08B 29/04 (2006.01)
CPC (source: EP)
G08B 13/04 (2013.01); G08B 13/1672 (2013.01); G08B 29/046 (2013.01)
Citation (applicant)
- US 5164703 A 19921117 - RICKMAN STEPHEN A [US]
- US 2016093178 A1 20160331 - ZHEVELEV BORIS [IL]
- GB 2370118 A 20020619 - HONEYWELL INC [US]
- US 5471195 A 19951128 - RICKMAN STEPHEN A [US]
Citation (search report)
- [A] JP 2005078499 A 20050324 - MATSUSHITA ELECTRIC WORKS LTD
- [A] JP 2007233434 A 20070913 - TOKAI RIKA CO LTD
- [A] GB 2284668 A 19950614 - VISONIC LTD [IL]
Designated contracting state (EPC)
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated extension state (EPC)
BA ME
DOCDB simple family (publication)
DOCDB simple family (application)
EP 17204945 A 20171201