FR349059A - Système de microphone - Google Patents

Système de microphone

Info

Publication number
FR349059A
FR349059A FR349059A FR349059DA FR349059A FR 349059 A FR349059 A FR 349059A FR 349059 A FR349059 A FR 349059A FR 349059D A FR349059D A FR 349059DA FR 349059 A FR349059 A FR 349059A
Authority
FR
France
Prior art keywords
microphone system
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
FR349059A
Other languages
English (en)
Inventor
Francois-Fernand Bourdil
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.)
FRANCOIS-FERNAND BOURDIL
Original Assignee
FRANCOIS-FERNAND BOURDIL
Filing date
Publication date
Application filed by FRANCOIS-FERNAND BOURDIL filed Critical FRANCOIS-FERNAND BOURDIL
Application granted granted Critical
Publication of FR349059A publication Critical patent/FR349059A/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
    • 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

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
FR349059A 1904-03-07 Système de microphone Expired FR349059A (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR4478T

Publications (1)

Publication Number Publication Date
FR349059A true FR349059A (fr) 1905-05-10

Family

ID=8597718

Family Applications (2)

Application Number Title Priority Date Filing Date
FR4478A Expired FR4478E (fr) Système de microphone
FR349059A Expired FR349059A (fr) 1904-03-07 Système de microphone

Family Applications Before (1)

Application Number Title Priority Date Filing Date
FR4478A Expired FR4478E (fr) Système de microphone

Country Status (1)

Country Link
FR (2) FR349059A (fr)

Also Published As

Publication number Publication date
FR4478E (fr) 1905-08-26

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