FR626679A - Improvements to acoustic devices - Google Patents

Improvements to acoustic devices

Info

Publication number
FR626679A
FR626679A FR626679DA FR626679A FR 626679 A FR626679 A FR 626679A FR 626679D A FR626679D A FR 626679DA FR 626679 A FR626679 A FR 626679A
Authority
FR
France
Prior art keywords
acoustic devices
acoustic
devices
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)
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.)
Thales SA
Original Assignee
Le Materiel Telephonique Thomson CSF
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 Le Materiel Telephonique Thomson CSF filed Critical Le Materiel Telephonique Thomson CSF
Application granted granted Critical
Publication of FR626679A publication Critical patent/FR626679A/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
    • H04R7/12—Non-planar diaphragms or cones

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
  • Details Of Audible-Bandwidth Transducers (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
FR626679D 1926-02-24 1926-12-23 Improvements to acoustic devices Expired FR626679A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US90297A US1678833A (en) 1926-02-24 1926-02-24 Acoustic device

Publications (1)

Publication Number Publication Date
FR626679A true FR626679A (en) 1927-09-16

Family

ID=22222163

Family Applications (1)

Application Number Title Priority Date Filing Date
FR626679D Expired FR626679A (en) 1926-02-24 1926-12-23 Improvements to acoustic devices

Country Status (4)

Country Link
US (1) US1678833A (en)
FR (1) FR626679A (en)
GB (1) GB266675A (en)
NL (1) NL21660C (en)

Also Published As

Publication number Publication date
GB266675A (en) 1928-03-02
US1678833A (en) 1928-07-31
NL21660C (en)

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