FR688427A - Microphone perfectionné - Google Patents

Microphone perfectionné

Info

Publication number
FR688427A
FR688427A FR688427DA FR688427A FR 688427 A FR688427 A FR 688427A FR 688427D A FR688427D A FR 688427DA FR 688427 A FR688427 A FR 688427A
Authority
FR
France
Prior art keywords
microphone
advanced
advanced microphone
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
English (en)
Inventor
Matei Marinesco
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 FR688427A publication Critical patent/FR688427A/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
    • H04R21/021—Microphones with granular resistance material

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
FR688427D 1930-01-18 1930-01-18 Microphone perfectionné Expired FR688427A (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR688427T 1930-01-18

Publications (1)

Publication Number Publication Date
FR688427A true FR688427A (fr) 1930-08-22

Family

ID=9026711

Family Applications (1)

Application Number Title Priority Date Filing Date
FR688427D Expired FR688427A (fr) 1930-01-18 1930-01-18 Microphone perfectionné

Country Status (1)

Country Link
FR (1) FR688427A (fr)

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