FR330829A - Microphone system - Google Patents

Microphone system

Info

Publication number
FR330829A
FR330829A FR330829DA FR330829A FR 330829 A FR330829 A FR 330829A FR 330829D A FR330829D A FR 330829DA FR 330829 A FR330829 A FR 330829A
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
Other languages
French (fr)
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.)
E RUOFF ET CIE SOC
Original Assignee
E RUOFF ET CIE SOC
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 by E RUOFF ET CIE SOC filed Critical E RUOFF ET CIE SOC
Application granted granted Critical
Publication of FR330829A publication Critical patent/FR330829A/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

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
FR330829D 1903-04-01 1903-04-01 Microphone system Expired FR330829A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR330829T 1903-04-01

Publications (1)

Publication Number Publication Date
FR330829A true FR330829A (en) 1903-08-26

Family

ID=1380581

Family Applications (1)

Application Number Title Priority Date Filing Date
FR330829D Expired FR330829A (en) 1903-04-01 1903-04-01 Microphone system

Country Status (1)

Country Link
FR (1) FR330829A (en)

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