FR584932A - Speakerphone - Google Patents

Speakerphone

Info

Publication number
FR584932A
FR584932A FR584932DA FR584932A FR 584932 A FR584932 A FR 584932A FR 584932D A FR584932D A FR 584932DA FR 584932 A FR584932 A FR 584932A
Authority
FR
France
Prior art keywords
speakerphone
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
Other languages
French (fr)
Inventor
Edouard-Henri-Franco Chateau
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
Application granted granted Critical
Publication of FR584932A publication Critical patent/FR584932A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R7/00—Diaphragms for electromechanical transducers; Cones
    • H04R7/02—Diaphragms for electromechanical transducers; Cones characterised by the construction
    • H04R7/04—Plane diaphragms
    • H04R7/06—Plane diaphragms comprising a plurality of sections or layers
    • H04R7/10—Plane diaphragms comprising a plurality of sections or layers comprising superposed layers in contact

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
FR584932D 1924-05-20 1924-05-20 Speakerphone Expired FR584932A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR584932T 1924-05-20

Publications (1)

Publication Number Publication Date
FR584932A true FR584932A (en) 1925-02-18

Family

ID=8959648

Family Applications (1)

Application Number Title Priority Date Filing Date
FR584932D Expired FR584932A (en) 1924-05-20 1924-05-20 Speakerphone

Country Status (1)

Country Link
FR (1) FR584932A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4122314A (en) * 1976-12-23 1978-10-24 Sony Corporation Loudspeaker having a laminate diaphragm of three layers

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4122314A (en) * 1976-12-23 1978-10-24 Sony Corporation Loudspeaker having a laminate diaphragm of three layers

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