FR727861A - Microphone refinements - Google Patents

Microphone refinements

Info

Publication number
FR727861A
FR727861A FR727861DA FR727861A FR 727861 A FR727861 A FR 727861A FR 727861D A FR727861D A FR 727861DA FR 727861 A FR727861 A FR 727861A
Authority
FR
France
Prior art keywords
refinements
microphone
microphone refinements
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.)
Telefonaktiebolaget LM Ericsson AB
Original Assignee
Telefonaktiebolaget LM Ericsson AB
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 Telefonaktiebolaget LM Ericsson AB filed Critical Telefonaktiebolaget LM Ericsson AB
Application granted granted Critical
Publication of FR727861A publication Critical patent/FR727861A/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)
  • Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)
FR727861D 1930-12-17 1931-12-04 Microphone refinements Expired FR727861A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3806030A GB366221A (en) 1930-12-17 1930-12-17 Improvements in or relating to microphones

Publications (1)

Publication Number Publication Date
FR727861A true FR727861A (en) 1932-06-25

Family

ID=10400881

Family Applications (1)

Application Number Title Priority Date Filing Date
FR727861D Expired FR727861A (en) 1930-12-17 1931-12-04 Microphone refinements

Country Status (2)

Country Link
FR (1) FR727861A (en)
GB (1) GB366221A (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1003263B (en) * 1953-01-05 1957-02-28 Krone Kg Electrode arrangement for speaking capsules filled with charcoal
CN103267153A (en) * 2013-05-30 2013-08-28 莆田市清华园电器发展有限公司 Water pressure inductive switch

Also Published As

Publication number Publication date
GB366221A (en) 1932-02-04

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