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FR2247032A1 - Telephonic system with light modulating microphone - uses optic fibres between microphone and receiver - Google Patents

Telephonic system with light modulating microphone - uses optic fibres between microphone and receiver

Info

Publication number
FR2247032A1
FR2247032A1 FR7335333A FR7335333A FR2247032A1 FR 2247032 A1 FR2247032 A1 FR 2247032A1 FR 7335333 A FR7335333 A FR 7335333A FR 7335333 A FR7335333 A FR 7335333A FR 2247032 A1 FR2247032 A1 FR 2247032A1
Authority
FR
France
Prior art keywords
microphone
light modulating
receiver
telephonic
telephonic system
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
FR7335333A
Other languages
French (fr)
Other versions
FR2247032B3 (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.)
REIBAUD JEAN
Original Assignee
REIBAUD JEAN
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 REIBAUD JEAN filed Critical REIBAUD JEAN
Priority to FR7335333A priority Critical patent/FR2247032A1/en
Publication of FR2247032A1 publication Critical patent/FR2247032A1/en
Application granted granted Critical
Publication of FR2247032B3 publication Critical patent/FR2247032B3/fr
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/11—Arrangements specific to free-space transmission, i.e. transmission through air or vacuum
    • H04B10/114—Indoor or close-range type systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R23/00—Transducers other than those covered by groups H04R9/00 - H04R21/00
    • H04R23/008—Transducers other than those covered by groups H04R9/00 - H04R21/00 using optical signals for detecting or generating sound

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Acoustics & Sound (AREA)
  • Electromagnetism (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)
  • Optical Communication System (AREA)

Abstract

Telephonic communications over short distances in factories and aircraft are often difficult due to parasitic interference. These problems are overcome using a light modulating microphone as part of a telephonic system. A microphone comprises a luminous source (1) which emits a luminous beam (2) onto the metallised reflecting surface of a flexible plastic membrane. With the membrane at rest an optic fibre receiver element (5) receives a predetermined part of the solid angle of the reflected light beam (6) which is increased when modulated by the speaker. A photocell detector (7) demodulates the light beam for amplification (8) to drive a loudspeaker (9).
FR7335333A 1973-10-03 1973-10-03 Telephonic system with light modulating microphone - uses optic fibres between microphone and receiver Granted FR2247032A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7335333A FR2247032A1 (en) 1973-10-03 1973-10-03 Telephonic system with light modulating microphone - uses optic fibres between microphone and receiver

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7335333A FR2247032A1 (en) 1973-10-03 1973-10-03 Telephonic system with light modulating microphone - uses optic fibres between microphone and receiver

Publications (2)

Publication Number Publication Date
FR2247032A1 true FR2247032A1 (en) 1975-05-02
FR2247032B3 FR2247032B3 (en) 1975-10-31

Family

ID=9125865

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7335333A Granted FR2247032A1 (en) 1973-10-03 1973-10-03 Telephonic system with light modulating microphone - uses optic fibres between microphone and receiver

Country Status (1)

Country Link
FR (1) FR2247032A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4284858A (en) * 1979-12-06 1981-08-18 Rockwell International Corporation Dichroic transducer
EP1118840A1 (en) * 2000-01-18 2001-07-25 Phone-Or Limited Echo-cancelling optical microphone
WO2006065203A1 (en) * 2004-12-17 2006-06-22 Totalförsvarets Forskningsinstitut Device for optical remote monitoring and system comprising such a device

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4284858A (en) * 1979-12-06 1981-08-18 Rockwell International Corporation Dichroic transducer
EP1118840A1 (en) * 2000-01-18 2001-07-25 Phone-Or Limited Echo-cancelling optical microphone
US6498853B2 (en) 2000-01-18 2002-12-24 Phone-Or Ltd. Echo-cancelling optical microphone
WO2006065203A1 (en) * 2004-12-17 2006-06-22 Totalförsvarets Forskningsinstitut Device for optical remote monitoring and system comprising such a device
US8050569B2 (en) 2004-12-17 2011-11-01 Totalförsvarets Forskningsinstitut Device for optical remote monitoring and system comprising such a device

Also Published As

Publication number Publication date
FR2247032B3 (en) 1975-10-31

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