FR2545247B1 - DIFFERENTIAL SOUND PRESSURE SENSOR - Google Patents
DIFFERENTIAL SOUND PRESSURE SENSORInfo
- Publication number
- FR2545247B1 FR2545247B1 FR8307283A FR8307283A FR2545247B1 FR 2545247 B1 FR2545247 B1 FR 2545247B1 FR 8307283 A FR8307283 A FR 8307283A FR 8307283 A FR8307283 A FR 8307283A FR 2545247 B1 FR2545247 B1 FR 2545247B1
- Authority
- FR
- France
- Prior art keywords
- pressure sensor
- sound pressure
- differential sound
- differential
- sensor
- Prior art date
- Legal status (The legal status 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 status listed.)
- Expired
Links
Classifications
-
- 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
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR8307283A FR2545247B1 (en) | 1983-04-28 | 1983-04-28 | DIFFERENTIAL SOUND PRESSURE SENSOR |
EP84400782A EP0127493A1 (en) | 1983-04-28 | 1984-04-19 | Acoustical pressure differential detector |
ES531947A ES8501909A1 (en) | 1983-04-28 | 1984-04-26 | Acoustical pressure differential detector. |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR8307283A FR2545247B1 (en) | 1983-04-28 | 1983-04-28 | DIFFERENTIAL SOUND PRESSURE SENSOR |
Publications (2)
Publication Number | Publication Date |
---|---|
FR2545247A1 FR2545247A1 (en) | 1984-11-02 |
FR2545247B1 true FR2545247B1 (en) | 1986-06-06 |
Family
ID=9288482
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR8307283A Expired FR2545247B1 (en) | 1983-04-28 | 1983-04-28 | DIFFERENTIAL SOUND PRESSURE SENSOR |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0127493A1 (en) |
ES (1) | ES8501909A1 (en) |
FR (1) | FR2545247B1 (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2588108A1 (en) * | 1985-09-27 | 1987-04-03 | Durand Michel | Active perimeter break-in detector |
GB8925308D0 (en) * | 1989-11-09 | 1989-12-28 | Taylor Michael R | Sound detection devices and systems |
GB2241577A (en) * | 1990-02-15 | 1991-09-04 | Nnc Ltd | Ultrasonic interference detector |
FR2735600A1 (en) * | 1995-06-13 | 1996-12-20 | Ponce Max | Infra-sound anti-theft and anti-intruder protection system |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1415498A (en) * | 1972-01-20 | 1975-11-26 | Securitas Alarm Ltd | Alarm system |
GB1573618A (en) * | 1976-03-16 | 1980-08-28 | Elliott Brothers London Ltd | Intruder alarm systems |
DE2852664C2 (en) * | 1978-12-06 | 1982-08-19 | Cerberus AG, 8708 Männedorf, Zürich | Procedure and arrangement for intrusion detection |
DE2900444A1 (en) * | 1979-01-08 | 1980-07-10 | Licentia Gmbh | METHOD AND CIRCUIT ARRANGEMENT FOR EVALUATING OUTPUT SIGNALS FROM SOUND RECEIVERS OF AN OBJECT PROTECTION MONITORING SYSTEM AND FOR GENERATING AN ALARM SIGNAL |
-
1983
- 1983-04-28 FR FR8307283A patent/FR2545247B1/en not_active Expired
-
1984
- 1984-04-19 EP EP84400782A patent/EP0127493A1/en not_active Ceased
- 1984-04-26 ES ES531947A patent/ES8501909A1/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
EP0127493A1 (en) | 1984-12-05 |
ES531947A0 (en) | 1984-12-16 |
ES8501909A1 (en) | 1984-12-16 |
FR2545247A1 (en) | 1984-11-02 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
ST | Notification of lapse | ||
AR | Application made for restoration | ||
BR | Restoration of rights | ||
ST | Notification of lapse |