GB2020871A - Regenerative Feedback Intruder Alarm Apparatus - Google Patents

Regenerative Feedback Intruder Alarm Apparatus

Info

Publication number
GB2020871A
GB2020871A GB7914509A GB7914509A GB2020871A GB 2020871 A GB2020871 A GB 2020871A GB 7914509 A GB7914509 A GB 7914509A GB 7914509 A GB7914509 A GB 7914509A GB 2020871 A GB2020871 A GB 2020871A
Authority
GB
United Kingdom
Prior art keywords
closed space
transmitter
receiver
alarm apparatus
acoustic
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.)
Granted
Application number
GB7914509A
Other versions
GB2020871B (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.)
SPIRIG E
Original Assignee
SPIRIG E
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
Priority claimed from US05/954,324 external-priority patent/US4263584A/en
Application filed by SPIRIG E filed Critical SPIRIG E
Priority to GB7914509A priority Critical patent/GB2020871B/en
Publication of GB2020871A publication Critical patent/GB2020871A/en
Application granted granted Critical
Publication of GB2020871B publication Critical patent/GB2020871B/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R25/00—Fittings or systems for preventing or indicating unauthorised use or theft of vehicles
    • B60R25/10—Fittings or systems for preventing or indicating unauthorised use or theft of vehicles actuating a signalling device
    • B60R25/104—Fittings or systems for preventing or indicating unauthorised use or theft of vehicles actuating a signalling device characterised by the type of theft warning signal, e.g. visual or audible signals with special characteristics
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R25/00—Fittings or systems for preventing or indicating unauthorised use or theft of vehicles
    • B60R25/10—Fittings or systems for preventing or indicating unauthorised use or theft of vehicles actuating a signalling device
    • 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
    • G08B13/1672—Actuation by interference with mechanical vibrations in air or other fluid using passive vibration detection systems using sonic detecting means, e.g. a microphone operating in the audio frequency range
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R25/00—Fittings or systems for preventing or indicating unauthorised use or theft of vehicles
    • B60R25/10—Fittings or systems for preventing or indicating unauthorised use or theft of vehicles actuating a signalling device
    • B60R2025/1013—Alarm systems characterised by the type of warning signal, e.g. visual, audible

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Multimedia (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Burglar Alarm Systems (AREA)

Abstract

An intruder alarm apparatus for protecting a building or a vehicle and consuming a minimal amount of energy when in "watch" condition. An acoustic transmitter T is placed inside (or outside) a closed space S being supervised, an acoustic receiver R is placed outside (or inside) the closed space, and an amplifier A has its input connected to the receiver output and its output connected to the transmitter input. If the integrity of the closed space is broken, if for example the enclosed wall is breached at B then an acoustic feedback loop is completed by a path being thus established between transmitter and receiver, such that oscillation occurs, and only now are substantial amounts of electrical energy consumed. <IMAGE>
GB7914509A 1978-05-15 1979-04-26 Regenerative feedback intruder alarm apparatus Expired GB2020871B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB7914509A GB2020871B (en) 1978-05-15 1979-04-26 Regenerative feedback intruder alarm apparatus

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GB1960478 1978-05-15
US05/954,324 US4263584A (en) 1978-05-15 1978-10-24 Regenerative feedback intruder alarm apparatus
GB7914509A GB2020871B (en) 1978-05-15 1979-04-26 Regenerative feedback intruder alarm apparatus

Publications (2)

Publication Number Publication Date
GB2020871A true GB2020871A (en) 1979-11-21
GB2020871B GB2020871B (en) 1982-12-08

Family

ID=27257775

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7914509A Expired GB2020871B (en) 1978-05-15 1979-04-26 Regenerative feedback intruder alarm apparatus

Country Status (1)

Country Link
GB (1) GB2020871B (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2119984A (en) * 1982-03-12 1983-11-23 Guglielmetti Electronique Infra-sonic detector and alarms including same
GB2193939A (en) * 1986-07-15 1988-02-24 Richard John Mace Vehicle protection apparatus
EP0916969A2 (en) * 1997-11-11 1999-05-19 GRUNDIG Aktiengesellschaft Car radio alarm apparatus
US6225902B1 (en) 1998-06-16 2001-05-01 Ncr Corporation Automatic teller machines

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2119984A (en) * 1982-03-12 1983-11-23 Guglielmetti Electronique Infra-sonic detector and alarms including same
GB2193939A (en) * 1986-07-15 1988-02-24 Richard John Mace Vehicle protection apparatus
EP0916969A2 (en) * 1997-11-11 1999-05-19 GRUNDIG Aktiengesellschaft Car radio alarm apparatus
EP0916969A3 (en) * 1997-11-11 1999-11-03 GRUNDIG Aktiengesellschaft Car radio alarm apparatus
US6225902B1 (en) 1998-06-16 2001-05-01 Ncr Corporation Automatic teller machines

Also Published As

Publication number Publication date
GB2020871B (en) 1982-12-08

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee