FR674320A - Improvements to sound reproduction devices - Google Patents

Improvements to sound reproduction devices

Info

Publication number
FR674320A
FR674320A FR674320DA FR674320A FR 674320 A FR674320 A FR 674320A FR 674320D A FR674320D A FR 674320DA FR 674320 A FR674320 A FR 674320A
Authority
FR
France
Prior art keywords
sound reproduction
reproduction devices
devices
sound
reproduction
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
Howard Erskine White
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 FR674320A publication Critical patent/FR674320A/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
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/20—Arrangements for obtaining desired frequency or directional characteristics

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
FR674320D 1928-05-07 1929-05-01 Improvements to sound reproduction devices Expired FR674320A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US674320XA 1928-05-07 1928-05-07

Publications (1)

Publication Number Publication Date
FR674320A true FR674320A (en) 1930-01-27

Family

ID=22075940

Family Applications (1)

Application Number Title Priority Date Filing Date
FR674320D Expired FR674320A (en) 1928-05-07 1929-05-01 Improvements to sound reproduction devices

Country Status (1)

Country Link
FR (1) FR674320A (en)

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