FR2359471A1 - Centralised security surveillance system - has logic circuit initiating alarm if abnormal condition persists for specified time period - Google Patents

Centralised security surveillance system - has logic circuit initiating alarm if abnormal condition persists for specified time period

Info

Publication number
FR2359471A1
FR2359471A1 FR7622525A FR7622525A FR2359471A1 FR 2359471 A1 FR2359471 A1 FR 2359471A1 FR 7622525 A FR7622525 A FR 7622525A FR 7622525 A FR7622525 A FR 7622525A FR 2359471 A1 FR2359471 A1 FR 2359471A1
Authority
FR
France
Prior art keywords
circuit
surveillance system
logic circuit
security surveillance
time period
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
FR7622525A
Other languages
French (fr)
Other versions
FR2359471B3 (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.)
HELITA
Original Assignee
HELITA
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 HELITA filed Critical HELITA
Priority to FR7622525A priority Critical patent/FR2359471A1/en
Publication of FR2359471A1 publication Critical patent/FR2359471A1/en
Application granted granted Critical
Publication of FR2359471B3 publication Critical patent/FR2359471B3/fr
Granted legal-status Critical Current

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
    • G08B25/00—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems
    • G08B25/14—Central alarm receiver or annunciator arrangements

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Alarm Systems (AREA)

Abstract

The centralised security surveillance system, for buildings etc., has signals received from respective detectors, with normally closed contacts, applied to a series of input paths connected via a coupling circuit to the alarm circuit. The coupling circuit includes a logic circuit, connected to a monostable continuity detection circuit, providing an output pulse with a given delay after reception of an abnormal signal from one of the input paths. A bistable detection circuit has its clock input coupled to the output of the monostable circuit and its control input coupled to the input of the latter, for operating the alarm if the abnormal signal persists without interruption through out the latter delay period.
FR7622525A 1976-07-23 1976-07-23 Centralised security surveillance system - has logic circuit initiating alarm if abnormal condition persists for specified time period Granted FR2359471A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7622525A FR2359471A1 (en) 1976-07-23 1976-07-23 Centralised security surveillance system - has logic circuit initiating alarm if abnormal condition persists for specified time period

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7622525A FR2359471A1 (en) 1976-07-23 1976-07-23 Centralised security surveillance system - has logic circuit initiating alarm if abnormal condition persists for specified time period

Publications (2)

Publication Number Publication Date
FR2359471A1 true FR2359471A1 (en) 1978-02-17
FR2359471B3 FR2359471B3 (en) 1979-04-13

Family

ID=9176063

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7622525A Granted FR2359471A1 (en) 1976-07-23 1976-07-23 Centralised security surveillance system - has logic circuit initiating alarm if abnormal condition persists for specified time period

Country Status (1)

Country Link
FR (1) FR2359471A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2592200A1 (en) * 1985-12-24 1987-06-26 Maisonnette Michel Electronic device for detecting any untimely triggering of an alarm
FR2618931A1 (en) * 1987-07-28 1989-02-03 Morey Gilles METHOD OF OPERATING A MONITORING INSTALLATION
FR2694200A1 (en) * 1992-07-31 1994-02-04 Anelec Fire protection system preventing unnecessary triggering - has microprocessor connected to sensors with function control to provide logical fault signal and alarm control for alarm signal

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2592200A1 (en) * 1985-12-24 1987-06-26 Maisonnette Michel Electronic device for detecting any untimely triggering of an alarm
FR2618931A1 (en) * 1987-07-28 1989-02-03 Morey Gilles METHOD OF OPERATING A MONITORING INSTALLATION
EP0306692A1 (en) * 1987-07-28 1989-03-15 Gilles Morey Working method and room monitoring arrangement
FR2694200A1 (en) * 1992-07-31 1994-02-04 Anelec Fire protection system preventing unnecessary triggering - has microprocessor connected to sensors with function control to provide logical fault signal and alarm control for alarm signal

Also Published As

Publication number Publication date
FR2359471B3 (en) 1979-04-13

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Legal Events

Date Code Title Description
ST Notification of lapse