FR4478E - Microphone system - Google Patents

Microphone system

Info

Publication number
FR4478E
FR4478E FR4478A FR4478DA FR4478E FR 4478 E FR4478 E FR 4478E FR 4478 A FR4478 A FR 4478A FR 4478D A FR4478D A FR 4478DA FR 4478 E FR4478 E FR 4478E
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
FR4478A
Other languages
French (fr)
Inventor
Francois 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 BOURDIL
Original Assignee
FRANCOIS BOURDIL
Publication date
Application granted granted Critical
Publication of FR4478E publication Critical patent/FR4478E/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
    • 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; DEAF-AID SETS; 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)
FR4478A Microphone system Expired FR4478E (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR4478T

Publications (1)

Publication Number Publication Date
FR4478E true FR4478E (en) 1905-08-26

Family

ID=8597718

Family Applications (2)

Application Number Title Priority Date Filing Date
FR4478A Expired FR4478E (en) Microphone system
FR349059A Expired FR349059A (en) 1904-03-07 Microphone system

Family Applications After (1)

Application Number Title Priority Date Filing Date
FR349059A Expired FR349059A (en) 1904-03-07 Microphone system

Country Status (1)

Country Link
FR (2) FR349059A (en)

Also Published As

Publication number Publication date
FR349059A (en) 1905-05-10

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