FR632498A - - Google Patents

Info

Publication number
FR632498A
FR632498A FR632498DA FR632498A FR 632498 A FR632498 A FR 632498A FR 632498D A FR632498D A FR 632498DA FR 632498 A FR632498 A FR 632498A
Authority
FR
France
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)
Publication date
Application granted granted Critical
Publication of FR632498A publication Critical patent/FR632498A/fr
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R21/00—Variable-resistance transducers
    • H04R21/02—Microphones
    • H04R21/023—Microphones with more than one granular chamber

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
FR632498D Expired FR632498A (cg-RX-API-DMAC7.html)

Publications (1)

Publication Number Publication Date
FR632498A true FR632498A (cg-RX-API-DMAC7.html) 1928-01-10

Family

ID=1541586

Family Applications (1)

Application Number Title Priority Date Filing Date
FR632498D Expired FR632498A (cg-RX-API-DMAC7.html)

Country Status (1)

Country Link
FR (1) FR632498A (cg-RX-API-DMAC7.html)

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