FR537197A - Improvements to audio calls - Google Patents

Improvements to audio calls

Info

Publication number
FR537197A
FR537197A FR537197DA FR537197A FR 537197 A FR537197 A FR 537197A FR 537197D A FR537197D A FR 537197DA FR 537197 A FR537197 A FR 537197A
Authority
FR
France
Prior art keywords
audio calls
calls
audio
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.)
Compagnie Francaise Thomson Houston SA
Original Assignee
Compagnie Francaise Thomson Houston SA
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 Compagnie Francaise Thomson Houston SA filed Critical Compagnie Francaise Thomson Houston SA
Application granted granted Critical
Publication of FR537197A publication Critical patent/FR537197A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K9/00—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers
    • G10K9/12—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers electrically operated
    • G10K9/13—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers electrically operated using electromagnetic driving means
    • G10K9/15—Self-interrupting arrangements

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
FR537197D 1920-04-22 1921-04-19 Improvements to audio calls Expired FR537197A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB537197X 1920-04-22

Publications (1)

Publication Number Publication Date
FR537197A true FR537197A (en) 1922-05-17

Family

ID=10468761

Family Applications (1)

Application Number Title Priority Date Filing Date
FR537197D Expired FR537197A (en) 1920-04-22 1921-04-19 Improvements to audio calls

Country Status (1)

Country Link
FR (1) FR537197A (en)

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