FR1418134A - Audible warning device with increasing intensity over time - Google Patents

Audible warning device with increasing intensity over time

Info

Publication number
FR1418134A
FR1418134A FR989557A FR989557A FR1418134A FR 1418134 A FR1418134 A FR 1418134A FR 989557 A FR989557 A FR 989557A FR 989557 A FR989557 A FR 989557A FR 1418134 A FR1418134 A FR 1418134A
Authority
FR
France
Prior art keywords
over time
warning device
intensity over
audible warning
increasing intensity
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
FR989557A
Other languages
French (fr)
Inventor
Andre Emile Charles Merlin
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 filed Critical
Priority to DES93387A priority Critical patent/DE1211287B/en
Priority to FR989557A priority patent/FR1418134A/en
Application granted granted Critical
Publication of FR1418134A publication Critical patent/FR1418134A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M19/00—Current supply arrangements for telephone systems
    • H04M19/02—Current supply arrangements for telephone systems providing ringing current or supervisory tones, e.g. dialling tone or busy tone
    • H04M19/04—Current supply arrangements for telephone systems providing ringing current or supervisory tones, e.g. dialling tone or busy tone the ringing-current being generated at the substations
    • 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

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
FR989557A 1964-09-28 1964-09-28 Audible warning device with increasing intensity over time Expired FR1418134A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DES93387A DE1211287B (en) 1964-09-28 1964-09-28 Circuit arrangement for a call device in telecommunications systems
FR989557A FR1418134A (en) 1964-09-28 1964-09-28 Audible warning device with increasing intensity over time

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR989557A FR1418134A (en) 1964-09-28 1964-09-28 Audible warning device with increasing intensity over time

Publications (1)

Publication Number Publication Date
FR1418134A true FR1418134A (en) 1965-11-19

Family

ID=8839225

Family Applications (1)

Application Number Title Priority Date Filing Date
FR989557A Expired FR1418134A (en) 1964-09-28 1964-09-28 Audible warning device with increasing intensity over time

Country Status (1)

Country Link
FR (1) FR1418134A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2469840A1 (en) * 1979-11-12 1981-05-22 Astier Michel Subscriber phone electronic device - counts incoming call signals and, after preset count, increases ringing tone intensity
WO1999053455A1 (en) * 1998-04-08 1999-10-21 Koninklijke Philips Electronics N.V. Method of producing alarm signals

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2469840A1 (en) * 1979-11-12 1981-05-22 Astier Michel Subscriber phone electronic device - counts incoming call signals and, after preset count, increases ringing tone intensity
WO1999053455A1 (en) * 1998-04-08 1999-10-21 Koninklijke Philips Electronics N.V. Method of producing alarm signals

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