FR730993A - Microphone à grenaille de charbon - Google Patents

Microphone à grenaille de charbon

Info

Publication number
FR730993A
FR730993A FR730993DA FR730993A FR 730993 A FR730993 A FR 730993A FR 730993D A FR730993D A FR 730993DA FR 730993 A FR730993 A FR 730993A
Authority
FR
France
Prior art keywords
charcoal
shot
microphone
shot microphone
charcoal shot
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)
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.)
Koninklijke Philips NV
Original Assignee
Philips Gloeilampenfabrieken NV
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 Philips Gloeilampenfabrieken NV filed Critical Philips Gloeilampenfabrieken NV
Application granted granted Critical
Publication of FR730993A publication Critical patent/FR730993A/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
    • H04R21/026—Microphones in which the sound is perpendicular to the current crossing the transducer material

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)
FR730993D 1931-02-23 1932-02-03 Microphone à grenaille de charbon Expired FR730993A (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE372716X 1931-02-23

Publications (1)

Publication Number Publication Date
FR730993A true FR730993A (fr) 1932-08-26

Family

ID=6333783

Family Applications (1)

Application Number Title Priority Date Filing Date
FR730993D Expired FR730993A (fr) 1931-02-23 1932-02-03 Microphone à grenaille de charbon

Country Status (2)

Country Link
FR (1) FR730993A (fr)
GB (1) GB372716A (fr)

Also Published As

Publication number Publication date
GB372716A (en) 1932-05-12

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