FR673559A - Improvement in sound reproduction and recording devices - Google Patents

Improvement in sound reproduction and recording devices

Info

Publication number
FR673559A
FR673559A FR673559DA FR673559A FR 673559 A FR673559 A FR 673559A FR 673559D A FR673559D A FR 673559DA FR 673559 A FR673559 A FR 673559A
Authority
FR
France
Prior art keywords
improvement
recording devices
sound reproduction
reproduction
sound
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
Charles Henry Johnson
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 FR673559A publication Critical patent/FR673559A/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
    • H04R11/00—Transducers of moving-armature or moving-core type
    • H04R11/08—Gramophone pick-ups using a stylus; Recorders using a stylus

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Reciprocating, Oscillating Or Vibrating Motors (AREA)
FR673559D 1928-05-04 1929-04-19 Improvement in sound reproduction and recording devices Expired FR673559A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1313028A GB312468A (en) 1928-05-04 1928-05-04 Improvements in or connected with sound reproducing and recording apparatus

Publications (1)

Publication Number Publication Date
FR673559A true FR673559A (en) 1930-01-16

Family

ID=10017370

Family Applications (1)

Application Number Title Priority Date Filing Date
FR673559D Expired FR673559A (en) 1928-05-04 1929-04-19 Improvement in sound reproduction and recording devices

Country Status (4)

Country Link
BE (1) BE360317A (en)
FR (1) FR673559A (en)
GB (1) GB312468A (en)
NL (1) NL26615C (en)

Also Published As

Publication number Publication date
BE360317A (en)
GB312468A (en) 1929-05-30
NL26615C (en)

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