FR2287732A1 - Installation d'alerte sonore selective - Google Patents

Installation d'alerte sonore selective

Info

Publication number
FR2287732A1
FR2287732A1 FR7433959A FR7433959A FR2287732A1 FR 2287732 A1 FR2287732 A1 FR 2287732A1 FR 7433959 A FR7433959 A FR 7433959A FR 7433959 A FR7433959 A FR 7433959A FR 2287732 A1 FR2287732 A1 FR 2287732A1
Authority
FR
France
Prior art keywords
alarm
sound
frequency
low frequency
frequency sources
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.)
Withdrawn
Application number
FR7433959A
Other languages
English (en)
Inventor
Jacques Henri Gilbert Schmit
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.)
Daumas SA Ets
Original Assignee
Daumas SA Ets
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 Daumas SA Ets filed Critical Daumas SA Ets
Priority to FR7433959A priority Critical patent/FR2287732A1/fr
Publication of FR2287732A1 publication Critical patent/FR2287732A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B3/00—Audible signalling systems; Audible personal calling systems
    • G08B3/10—Audible signalling systems; Audible personal calling systems using electric transmission; using electromagnetic transmission
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B27/00—Alarm systems in which the alarm condition is signalled from a central station to a plurality of substations

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Electromagnetism (AREA)
  • Alarm Systems (AREA)
FR7433959A 1974-10-09 1974-10-09 Installation d'alerte sonore selective Withdrawn FR2287732A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7433959A FR2287732A1 (fr) 1974-10-09 1974-10-09 Installation d'alerte sonore selective

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7433959A FR2287732A1 (fr) 1974-10-09 1974-10-09 Installation d'alerte sonore selective

Publications (1)

Publication Number Publication Date
FR2287732A1 true FR2287732A1 (fr) 1976-05-07

Family

ID=9143895

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7433959A Withdrawn FR2287732A1 (fr) 1974-10-09 1974-10-09 Installation d'alerte sonore selective

Country Status (1)

Country Link
FR (1) FR2287732A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0352848A2 (fr) * 1988-07-25 1990-01-31 Koninklijke Philips Electronics N.V. Systèmes à groupes électroniques de montage avec au moins un multiprocesseur
EP0493973A1 (fr) * 1990-12-29 1992-07-08 Nec Corporation Circuit d'alarme sonore d'un recepteur d'appel pour la génération d'impulsions à frequence audible constante et à rapport cyclique variable et modulées par un unique signal d'avertissement

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0352848A2 (fr) * 1988-07-25 1990-01-31 Koninklijke Philips Electronics N.V. Systèmes à groupes électroniques de montage avec au moins un multiprocesseur
EP0352848A3 (fr) * 1988-07-25 1992-02-26 Koninklijke Philips Electronics N.V. Systèmes à groupes électroniques de montage avec au moins un multiprocesseur
EP0493973A1 (fr) * 1990-12-29 1992-07-08 Nec Corporation Circuit d'alarme sonore d'un recepteur d'appel pour la génération d'impulsions à frequence audible constante et à rapport cyclique variable et modulées par un unique signal d'avertissement
AU649505B2 (en) * 1990-12-29 1994-05-26 Nec Corporation Radio pager tone alarm circuit for generating variable duty constant audio frequency pulses modulated with unique tone pattern

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Legal Events

Date Code Title Description
ST Notification of lapse