NO884823D0 - DIFFERENTIAL DETECTOR FOR SOUND PRESSURE DETECTION. - Google Patents
DIFFERENTIAL DETECTOR FOR SOUND PRESSURE DETECTION.Info
- Publication number
- NO884823D0 NO884823D0 NO1988884823A NO884823A NO884823D0 NO 884823 D0 NO884823 D0 NO 884823D0 NO 1988884823 A NO1988884823 A NO 1988884823A NO 884823 A NO884823 A NO 884823A NO 884823 D0 NO884823 D0 NO 884823D0
- Authority
- NO
- Norway
- Prior art keywords
- differential detector
- sound pressure
- pressure detection
- threshold value
- microphone
- Prior art date
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>
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 true NO884823D0 (en) | 1988-10-28 |
NO884823L NO884823L (en) | 1989-05-02 |
NO174487B NO174487B (en) | 1994-01-31 |
NO174487C 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)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2263771A (en) * | 1992-01-04 | 1993-08-04 | Sound International Ltd | Intruder alarms |
ATE171120T1 (en) * | 1993-07-19 | 1998-10-15 | Ping Lee | A COMBINATION OF A MOTOR VEHICLE WITH AN ALARM SYSTEM |
Family Cites Families (7)
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 |
-
1987
- 1987-10-30 FR FR8715052A patent/FR2622719A1/en not_active Withdrawn
-
1988
- 1988-10-17 DE DE8888440086T patent/DE3870163D1/en not_active Expired - Lifetime
- 1988-10-17 EP EP88440086A patent/EP0317459B1/en not_active Expired - Lifetime
- 1988-10-17 AT AT88440086T patent/ATE75063T1/en not_active IP Right Cessation
- 1988-10-27 CA CA000581520A patent/CA1311292C/en not_active Expired - Lifetime
- 1988-10-28 NO NO884823A patent/NO174487C/en unknown
- 1988-10-28 DK DK601688A patent/DK169647B1/en not_active IP Right Cessation
-
1992
- 1992-07-15 GR GR920401525T patent/GR3005179T3/el unknown
Also Published As
Publication number | Publication date |
---|---|
DK169647B1 (en) | 1995-01-02 |
EP0317459B1 (en) | 1992-04-15 |
NO884823L (en) | 1989-05-02 |
FR2622719A1 (en) | 1989-05-05 |
DK601688D0 (en) | 1988-10-28 |
GR3005179T3 (en) | 1993-05-24 |
ATE75063T1 (en) | 1992-05-15 |
CA1311292C (en) | 1992-12-08 |
DE3870163D1 (en) | 1992-05-21 |
NO174487B (en) | 1994-01-31 |
NO174487C (en) | 1994-05-11 |
DK601688A (en) | 1989-05-01 |
EP0317459A2 (en) | 1989-05-24 |
EP0317459A3 (en) | 1989-08-09 |
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