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ES8501909A1 - Acoustical pressure differential detector. - Google Patents

Acoustical pressure differential detector.

Info

Publication number
ES8501909A1
ES8501909A1 ES531947A ES531947A ES8501909A1 ES 8501909 A1 ES8501909 A1 ES 8501909A1 ES 531947 A ES531947 A ES 531947A ES 531947 A ES531947 A ES 531947A ES 8501909 A1 ES8501909 A1 ES 8501909A1
Authority
ES
Spain
Prior art keywords
pressure differential
amplifier
circuit
differential detector
reference signal
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
Application number
ES531947A
Other languages
Spanish (es)
Other versions
ES531947A0 (en
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
LAZARTIGUES CLAUDE
Original Assignee
LAZARTIGUES CLAUDE
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
Application filed by LAZARTIGUES CLAUDE filed Critical LAZARTIGUES CLAUDE
Publication of ES531947A0 publication Critical patent/ES531947A0/en
Publication of ES8501909A1 publication Critical patent/ES8501909A1/en
Expired legal-status Critical Current

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

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Burglar Alarm Systems (AREA)
  • Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
  • Measuring Fluid Pressure (AREA)

Abstract

The detector involves an electronic circuit for analysing the signals transmitted by a data sensor and for delivering a control signal when these signals cause an aperiodic variation to appear in the electrical signal received by the said circuit. The device consists of a differentiating circuit (6), a high gain DC amplifier (9), a regulating system for adjusting the operating point of the amplifier (7 and 8), a frequency-stabilized reference signal generator (12), a control system for injecting the reference signal (10 and 11), a frequency comparator (13), a filter (14) and a threshold detector (15).
ES531947A 1983-04-28 1984-04-26 Acoustical pressure differential detector. Expired ES8501909A1 (en)

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
ES531947A0 ES531947A0 (en) 1984-12-16
ES8501909A1 true ES8501909A1 (en) 1984-12-16

Family

ID=9288482

Family Applications (1)

Application Number Title Priority Date Filing Date
ES531947A Expired ES8501909A1 (en) 1983-04-28 1984-04-26 Acoustical pressure differential detector.

Country Status (3)

Country Link
EP (1) EP0127493A1 (en)
ES (1) ES8501909A1 (en)
FR (1) FR2545247B1 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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

Also Published As

Publication number Publication date
EP0127493A1 (en) 1984-12-05
ES531947A0 (en) 1984-12-16
FR2545247A1 (en) 1984-11-02
FR2545247B1 (en) 1986-06-06

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