GB1531827A - Alarm system for detecting disturbance of a solid medium - Google Patents

Alarm system for detecting disturbance of a solid medium

Info

Publication number
GB1531827A
GB1531827A GB2860/76A GB286076A GB1531827A GB 1531827 A GB1531827 A GB 1531827A GB 2860/76 A GB2860/76 A GB 2860/76A GB 286076 A GB286076 A GB 286076A GB 1531827 A GB1531827 A GB 1531827A
Authority
GB
United Kingdom
Prior art keywords
output
mixer
pattern
signal
applying
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
GB2860/76A
Other languages
English (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.)
American District Telegraph Co
Original Assignee
American District Telegraph Co
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 American District Telegraph Co filed Critical American District Telegraph Co
Publication of GB1531827A publication Critical patent/GB1531827A/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
    • G08B13/1609—Actuation by interference with mechanical vibrations in air or other fluid using active vibration detection systems
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/02—Mechanical actuation
    • G08B13/04—Mechanical actuation by breaking of glass

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Burglar Alarm Systems (AREA)
  • Emergency Alarm Devices (AREA)
GB2860/76A 1975-01-30 1976-01-26 Alarm system for detecting disturbance of a solid medium Expired GB1531827A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US05/545,388 US4023156A (en) 1975-01-30 1975-01-30 Alarm system for detecting disturbance of a solid medium

Publications (1)

Publication Number Publication Date
GB1531827A true GB1531827A (en) 1978-11-08

Family

ID=24176010

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2860/76A Expired GB1531827A (en) 1975-01-30 1976-01-26 Alarm system for detecting disturbance of a solid medium

Country Status (4)

Country Link
US (1) US4023156A (enExample)
JP (1) JPS5520272B2 (enExample)
DE (1) DE2603593B2 (enExample)
GB (1) GB1531827A (enExample)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2143976A (en) * 1983-07-14 1985-02-20 Shorrock Security Systems Ltd Window glass breakage detector apparatus
GB2242745A (en) * 1990-03-14 1991-10-09 Geoquip Ltd Intrusion detection system and signal processing circuitry therefor

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4112420A (en) * 1975-07-31 1978-09-05 Matsushita Electric Industrial Company Limited Apparatus for detecting the breakage of an acoustically conductive medium
DE2646160C2 (de) * 1975-12-08 1983-12-22 Cerberus AG, 8708 Männedorf, Zürich Verfahren und Vorrichtung zur Überwachung schalleitender Medien
US4149156A (en) * 1977-06-10 1979-04-10 Leonard Blasucci Window alarm employing a releasably mounted plunger switch
US4213196A (en) * 1978-02-21 1980-07-15 Matsushita Electric Works, Ltd. Ultrasonic type motion detector
US4414652A (en) * 1981-06-26 1983-11-08 Honeywell, Inc. Ultrasonic line sensor
US4928085A (en) * 1983-02-23 1990-05-22 Bluegrass Electronics, Inc. Pressure change intrusion detector
DE3529402C1 (de) * 1985-08-16 1986-12-18 f + g megamos Sicherheitselektronik GmbH, 5250 Engelskirchen Verfahren zum Überwachen des Zustandes von Räumen
US4935723A (en) * 1989-08-21 1990-06-19 General Electric Company Polymeric security window
CA2060485C (en) * 1991-02-05 2003-01-07 Ruggero Cadossi Contact detecting and signaling device
US6701673B1 (en) * 1992-05-13 2004-03-09 Brose Fahrzeugteile Gmbh & Co. Kg Openable and closable motor vehicle window
US5506566A (en) * 1993-05-06 1996-04-09 Northern Telecom Limited Tamper detectable electronic security package
TW241352B (en) * 1994-03-30 1995-02-21 Whitaker Corp Reflective mode ultrasonic touch sensitive switch
DE29716609U1 (de) * 1997-09-16 1997-11-20 FRABA Sicherheitssysteme GmbH, 51063 Köln Schaltmatte
US7281667B2 (en) * 2005-04-14 2007-10-16 International Business Machines Corporation Method and structure for implementing secure multichip modules for encryption applications
JPWO2012039502A1 (ja) * 2010-09-24 2014-02-03 日本電気株式会社 防犯装置及び防犯システム並びに開閉体の状態を判別する方法
US11604168B2 (en) * 2019-12-03 2023-03-14 Pella Corporation Fenestration unit demonstration methods and systems

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR956771A (enExample) * 1944-10-07 1950-02-07
US2935728A (en) * 1946-02-15 1960-05-03 Rca Corp Underwater object locator
US3487396A (en) * 1966-03-11 1969-12-30 Franklin M Perelman Intrusion vibration detector with ambient noise compensator
US3760400A (en) * 1972-02-10 1973-09-18 Aerospace Res Intrusion detection system employing quadrature sampling
JPS4958282U (enExample) * 1972-08-28 1974-05-22
JPS4958283U (enExample) * 1972-08-28 1974-05-22
US3863240A (en) * 1972-12-08 1975-01-28 Aerospace Res Electromagnetic intrusion detection system
US3845461A (en) * 1973-06-25 1974-10-29 Honeywell Inc Intrusion detection system
CH557068A (de) * 1973-07-10 1974-12-13 Cerberus Ag Verfahren und vorrichtung zur ueberwachung wenigstens eines schalleitenden mediums.
US3889250A (en) * 1973-10-15 1975-06-10 Gulf & Western Mfg Co Active frequency-responsive glass breakage detector

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2143976A (en) * 1983-07-14 1985-02-20 Shorrock Security Systems Ltd Window glass breakage detector apparatus
GB2242745A (en) * 1990-03-14 1991-10-09 Geoquip Ltd Intrusion detection system and signal processing circuitry therefor

Also Published As

Publication number Publication date
US4023156A (en) 1977-05-10
DE2603593B2 (de) 1979-09-27
DE2603593A1 (de) 1976-08-05
AU1061476A (en) 1977-08-04
JPS5520272B2 (enExample) 1980-05-31
JPS51102600A (enExample) 1976-09-10

Similar Documents

Publication Publication Date Title
GB1531827A (en) Alarm system for detecting disturbance of a solid medium
GB1517628A (en) Method of and apparatus for supervising accoustically conductive media
ES438681A1 (es) Perfeccionamientos en sistemas de transmision de informa- cion.
GB1436025A (en) Breakage detector
MY105859A (en) Method and system for measuring azimuthal anisotropy effects using acoustic multipole transducers.
US4003045A (en) Intrusion detection systems with turbulence discrimination
GB1268640A (en) Acoustic detection apparatus
US3946377A (en) Method and apparatus to monitor conduction of sonic waves in an acoustically conductive medium
AU529926B2 (en) Paged receiver battery saver
GB1402530A (en) Detecting damage to glass
GB1497867A (en) Security system for surveying an area
CA2033983A1 (en) System and method for communications security protection
GB1349678A (en) Underwater direction finding system
GB1505823A (en) Ultrasonic flowmeter
GB1446925A (en) Method and apparatusfor adjusting sesitivity of an ultrasonic detection system
US3714576A (en) Seismic radio telemetry system
JPS5376797A (en) Receiver of fire alarm system
GB959140A (en) Improvements in or relating to arrangements for detecting objects
JPS5250784A (en) Ultrasonic type flow and density meter
GB1361499A (en) Protective system
GB1004615A (en) Improvements in or relating to moving object detection systems
EP0197542A3 (en) Selective call apparatus having display
JPS5767345A (en) Dispersal signal elimination circuit
FR2360886A1 (fr) Detecteur de mouvement a effet doppler
FR2331848A1 (fr) Procede et dispositif pour la surveillance des parois vitrees et analogues

Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19930126