FR2235442B1 - - Google Patents

Info

Publication number
FR2235442B1
FR2235442B1 FR7323590A FR7323590A FR2235442B1 FR 2235442 B1 FR2235442 B1 FR 2235442B1 FR 7323590 A FR7323590 A FR 7323590A FR 7323590 A FR7323590 A FR 7323590A FR 2235442 B1 FR2235442 B1 FR 2235442B1
Authority
FR
France
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
FR7323590A
Other languages
French (fr)
Other versions
FR2235442A1 (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.)
IFP Energies Nouvelles IFPEN
Original Assignee
IFP Energies Nouvelles IFPEN
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 IFP Energies Nouvelles IFPEN filed Critical IFP Energies Nouvelles IFPEN
Priority to FR7323590A priority Critical patent/FR2235442A1/fr
Priority to DE19742430745 priority patent/DE2430745A1/de
Priority to JP7377474A priority patent/JPS5034404A/ja
Publication of FR2235442A1 publication Critical patent/FR2235442A1/fr
Application granted granted Critical
Publication of FR2235442B1 publication Critical patent/FR2235442B1/fr
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M9/00—Arrangements for interconnection not involving centralised switching
    • H04M9/001—Two-way communication systems between a limited number of parties
    • 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
    • G08B25/01—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems characterised by the transmission medium
    • G08B25/016—Personal emergency signalling and security systems

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Security & Cryptography (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Emergency Alarm Devices (AREA)
  • Interconnected Communication Systems, Intercoms, And Interphones (AREA)
  • Circuit For Audible Band Transducer (AREA)
FR7323590A 1973-06-27 1973-06-27 Remote acoustic monitor for work stations - selective amplification of microphone signals ensures noise immunity Granted FR2235442A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
FR7323590A FR2235442A1 (en) 1973-06-27 1973-06-27 Remote acoustic monitor for work stations - selective amplification of microphone signals ensures noise immunity
DE19742430745 DE2430745A1 (de) 1973-06-27 1974-06-26 Sicherheitseinrichtung fuer die akustische fernueberwachung getrennter arbeitsstellen
JP7377474A JPS5034404A (enrdf_load_stackoverflow) 1973-06-27 1974-06-27

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7323590A FR2235442A1 (en) 1973-06-27 1973-06-27 Remote acoustic monitor for work stations - selective amplification of microphone signals ensures noise immunity

Publications (2)

Publication Number Publication Date
FR2235442A1 FR2235442A1 (en) 1975-01-24
FR2235442B1 true FR2235442B1 (enrdf_load_stackoverflow) 1977-05-13

Family

ID=9121681

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7323590A Granted FR2235442A1 (en) 1973-06-27 1973-06-27 Remote acoustic monitor for work stations - selective amplification of microphone signals ensures noise immunity

Country Status (3)

Country Link
JP (1) JPS5034404A (enrdf_load_stackoverflow)
DE (1) DE2430745A1 (enrdf_load_stackoverflow)
FR (1) FR2235442A1 (enrdf_load_stackoverflow)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5345008U (enrdf_load_stackoverflow) * 1976-09-20 1978-04-17

Also Published As

Publication number Publication date
JPS5034404A (enrdf_load_stackoverflow) 1975-04-02
FR2235442A1 (en) 1975-01-24
DE2430745A1 (de) 1975-01-23

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Legal Events

Date Code Title Description
RE Withdrawal of published application
ST Notification of lapse