EP 0317459 B1 19920415 - ACOUSTIC PRESSURE DIFFERENTIAL DETECTOR IN AN ALARM DEVICE
Title (en)
ACOUSTIC PRESSURE DIFFERENTIAL DETECTOR IN AN ALARM DEVICE
Publication
Application
Priority
FR 8715052 A 19871030
Abstract (en)
[origin: EP0317459A2] Acoustic pressure differential detector for detecting the aperiodic wave resulting from the opening of a door or window in a closed room, comprising a microphone (1) and means for fixing a sensitivity threshold value, characterised in that it comprises means of regulation (6, 10) for varying said threshold value as a function of the microphone output. <IMAGE>
IPC 1-7
IPC 8 full level
G08B 13/16 (2006.01); G08B 13/20 (2006.01); G08B 29/18 (2006.01)
CPC (source: EP)
G08B 13/1681 (2013.01); G08B 29/185 (2013.01)
Designated contracting state (EPC)
AT BE CH DE ES FR GB GR IT LI LU NL SE
DOCDB simple family (publication)
EP 0317459 A2 19890524; EP 0317459 A3 19890809; EP 0317459 B1 19920415; AT E75063 T1 19920515; CA 1311292 C 19921208; DE 3870163 D1 19920521; DK 169647 B1 19950102; DK 601688 A 19890501; DK 601688 D0 19881028; FR 2622719 A1 19890505; GR 3005179 T3 19930524; NO 174487 B 19940131; NO 174487 C 19940511; NO 884823 D0 19881028; NO 884823 L 19890502
DOCDB simple family (application)
EP 88440086 A 19881017; AT 88440086 T 19881017; CA 581520 A 19881027; DE 3870163 T 19881017; DK 601688 A 19881028; FR 8715052 A 19871030; GR 920401525 T 19920715; NO 884823 A 19881028