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FR35978E - Improvements to sound-producing devices - Google Patents

Improvements to sound-producing devices

Info

Publication number
FR35978E
FR35978E FR35978DA FR35978E FR 35978 E FR35978 E FR 35978E FR 35978D A FR35978D A FR 35978DA FR 35978 E FR35978 E FR 35978E
Authority
FR
France
Prior art keywords
sound
producing devices
producing
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.)
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
Priority claimed from US1483A external-priority patent/US1707617A/en
Priority claimed from GB25016/27A external-priority patent/GB300744A/en
Priority claimed from US224973A external-priority patent/US1774465A/en
Priority claimed from US238194A external-priority patent/US1748858A/en
Application filed by Compagnie Francaise Thomson Houston SA filed Critical Compagnie Francaise Thomson Houston SA
Application granted granted Critical
Publication of FR35978E publication Critical patent/FR35978E/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
    • H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/02—Details
    • H04R9/04—Construction, mounting, or centering of coil
    • H04R9/041—Centering
    • H04R9/042—Centering by pressurised air
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/02—Details
    • H04R9/025—Magnetic circuit

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
FR35978D 1925-01-09 1928-09-19 Improvements to sound-producing devices Expired FR35978E (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US1483A US1707617A (en) 1925-01-09 1925-01-09 Sound-reproducing apparatus
GB25016/27A GB300744A (en) 1927-09-22 1927-09-22 Improvements relating to devices for the interconversion of electric oscillations and sound waves or equivalent mechanical vibrations
US224973A US1774465A (en) 1927-10-08 1927-10-08 Apparatus for the interconversion of sound and electrical impulses
US238194A US1748858A (en) 1927-12-06 1927-12-06 Apparatus for the interconversion of sound and electrical impulses

Publications (1)

Publication Number Publication Date
FR35978E true FR35978E (en) 1930-03-31

Family

ID=27448653

Family Applications (1)

Application Number Title Priority Date Filing Date
FR35978D Expired FR35978E (en) 1925-01-09 1928-09-19 Improvements to sound-producing devices

Country Status (1)

Country Link
FR (1) FR35978E (en)

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