DK601688A - DIFFERENTIAL DETECTOR FOR Acoustic Pressure - Google Patents

DIFFERENTIAL DETECTOR FOR Acoustic Pressure

Info

Publication number
DK601688A
DK601688A DK601688A DK601688A DK601688A DK 601688 A DK601688 A DK 601688A DK 601688 A DK601688 A DK 601688A DK 601688 A DK601688 A DK 601688A DK 601688 A DK601688 A DK 601688A
Authority
DK
Denmark
Prior art keywords
acoustic pressure
differential detector
threshold value
microphone
regulation
Prior art date
Application number
DK601688A
Other languages
Danish (da)
Other versions
DK169647B1 (en
DK601688D0 (en
Inventor
Francois Philippe
Original Assignee
Francois Philippe
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=9356331&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=DK601688(A) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Francois Philippe filed Critical Francois Philippe
Publication of DK601688D0 publication Critical patent/DK601688D0/en
Publication of DK601688A publication Critical patent/DK601688A/en
Application granted granted Critical
Publication of DK169647B1 publication Critical patent/DK169647B1/en

Links

Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B29/00—Checking or monitoring of signalling or alarm systems; Prevention or correction of operating errors, e.g. preventing unauthorised operation
    • G08B29/18—Prevention or correction of operating errors
    • G08B29/185—Signal analysis techniques for reducing or preventing false alarms or for enhancing the reliability of the system
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/16—Actuation by interference with mechanical vibrations in air or other fluid
    • G08B13/1654—Actuation by interference with mechanical vibrations in air or other fluid using passive vibration detection systems
    • G08B13/1681—Actuation by interference with mechanical vibrations in air or other fluid using passive vibration detection systems using infrasonic detecting means, e.g. a microphone operating below the audible frequency range

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Measuring Fluid Pressure (AREA)
  • Burglar Alarm Systems (AREA)
  • Emergency Alarm Devices (AREA)

Abstract

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>
DK601688A 1987-10-30 1988-10-28 Differential detector for acoustic pressure DK169647B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8715052 1987-10-30
FR8715052A FR2622719A1 (en) 1987-10-30 1987-10-30 DIFFERENTIAL DETECTOR OF ACOUSTIC PRESSURE

Publications (3)

Publication Number Publication Date
DK601688D0 DK601688D0 (en) 1988-10-28
DK601688A true DK601688A (en) 1989-05-01
DK169647B1 DK169647B1 (en) 1995-01-02

Family

ID=9356331

Family Applications (1)

Application Number Title Priority Date Filing Date
DK601688A DK169647B1 (en) 1987-10-30 1988-10-28 Differential detector for acoustic pressure

Country Status (8)

Country Link
EP (1) EP0317459B1 (en)
AT (1) ATE75063T1 (en)
CA (1) CA1311292C (en)
DE (1) DE3870163D1 (en)
DK (1) DK169647B1 (en)
FR (1) FR2622719A1 (en)
GR (1) GR3005179T3 (en)
NO (1) NO174487C (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2263771A (en) * 1992-01-04 1993-08-04 Sound International Ltd Intruder alarms
DE69413332T2 (en) * 1993-07-19 1999-02-11 Ping West Hills Calif. Lee A combination of a motor vehicle with an alarm system

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3569923A (en) * 1967-10-30 1971-03-09 Us Navy Adaptive acoustic detector apparatus
FR2122343B1 (en) * 1971-01-21 1975-02-21 Ato Inc
GB1605185A (en) * 1976-11-09 1983-03-02 Plessey Co Ltd Sensing arrangements
US4442514A (en) * 1981-11-17 1984-04-10 The United States Of America As Represented By The Secretary Of The Air Force Security system signal processor
US4479113A (en) * 1982-01-20 1984-10-23 The United States Of America As Represented By The United States Department Of Energy Compensated intruder-detection systems
FR2523339A1 (en) * 1982-03-12 1983-09-16 Guglielmetti Vg Electro INFRA-SOUND VOLUMETRIC SENSOR DETECTION DEVICE AND INFRA-SOUND DETECTION METHOD
DE3300906A1 (en) * 1983-01-13 1984-07-19 Mauro 2054 Geesthacht Marmotti Method and device for room and building surveillance

Also Published As

Publication number Publication date
NO174487C (en) 1994-05-11
FR2622719A1 (en) 1989-05-05
CA1311292C (en) 1992-12-08
EP0317459A2 (en) 1989-05-24
NO884823D0 (en) 1988-10-28
DK169647B1 (en) 1995-01-02
DE3870163D1 (en) 1992-05-21
EP0317459A3 (en) 1989-08-09
ATE75063T1 (en) 1992-05-15
GR3005179T3 (en) 1993-05-24
EP0317459B1 (en) 1992-04-15
DK601688D0 (en) 1988-10-28
NO884823L (en) 1989-05-02
NO174487B (en) 1994-01-31

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Legal Events

Date Code Title Description
B1 Patent granted (law 1993)
PBP Patent lapsed