FR672159A - Microphone - Google Patents

Microphone

Info

Publication number
FR672159A
FR672159A FR672159DA FR672159A FR 672159 A FR672159 A FR 672159A FR 672159D A FR672159D A FR 672159DA FR 672159 A FR672159 A FR 672159A
Authority
FR
France
Prior art keywords
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)
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 FR672159A publication Critical patent/FR672159A/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; DEAF-AID SETS; 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)
FR672159D 1928-04-27 1929-03-27 Microphone Expired FR672159A (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL310513X 1928-04-27

Publications (1)

Publication Number Publication Date
FR672159A true FR672159A (fr) 1929-12-24

Family

ID=19783616

Family Applications (1)

Application Number Title Priority Date Filing Date
FR672159D Expired FR672159A (fr) 1928-04-27 1929-03-27 Microphone

Country Status (3)

Country Link
FR (1) FR672159A (fr)
GB (1) GB310513A (fr)
NL (1) NL25231C (fr)

Also Published As

Publication number Publication date
GB310513A (en) 1930-02-27
NL25231C (fr)

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