NO174487C - Differential detector for sound pressure detection - Google Patents

Differential detector for sound pressure detection

Info

Publication number
NO174487C
NO174487C NO884823A NO884823A NO174487C NO 174487 C NO174487 C NO 174487C NO 884823 A NO884823 A NO 884823A NO 884823 A NO884823 A NO 884823A NO 174487 C NO174487 C NO 174487C
Authority
NO
Norway
Prior art keywords
differential detector
sound pressure
pressure detection
threshold value
microphone
Prior art date
Application number
NO884823A
Other languages
Norwegian (no)
Other versions
NO174487B (en
NO884823D0 (en
NO884823L (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=NO174487(C) "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 NO884823D0 publication Critical patent/NO884823D0/en
Publication of NO884823L publication Critical patent/NO884823L/en
Publication of NO174487B publication Critical patent/NO174487B/en
Publication of NO174487C publication Critical patent/NO174487C/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>
NO884823A 1987-10-30 1988-10-28 Differential detector for sound pressure detection NO174487C (en)

Applications Claiming Priority (1)

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

Publications (4)

Publication Number Publication Date
NO884823D0 NO884823D0 (en) 1988-10-28
NO884823L NO884823L (en) 1989-05-02
NO174487B NO174487B (en) 1994-01-31
NO174487C true NO174487C (en) 1994-05-11

Family

ID=9356331

Family Applications (1)

Application Number Title Priority Date Filing Date
NO884823A NO174487C (en) 1987-10-30 1988-10-28 Differential detector for sound pressure detection

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
EP0635409B1 (en) * 1993-07-19 1998-09-16 Ping Lee An automobile and an alarm system in combination

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
EP0317459A3 (en) 1989-08-09
FR2622719A1 (en) 1989-05-05
ATE75063T1 (en) 1992-05-15
DK601688D0 (en) 1988-10-28
CA1311292C (en) 1992-12-08
DK601688A (en) 1989-05-01
EP0317459A2 (en) 1989-05-24
NO174487B (en) 1994-01-31
NO884823D0 (en) 1988-10-28
GR3005179T3 (en) 1993-05-24
NO884823L (en) 1989-05-02
DK169647B1 (en) 1995-01-02
EP0317459B1 (en) 1992-04-15
DE3870163D1 (en) 1992-05-21

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