FR520825A - Improvement in microphones - Google Patents

Improvement in microphones

Info

Publication number
FR520825A
FR520825A FR520825DA FR520825A FR 520825 A FR520825 A FR 520825A FR 520825D A FR520825D A FR 520825DA FR 520825 A FR520825 A FR 520825A
Authority
FR
France
Prior art keywords
microphones
improvement
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)
Inventor
William Kennedy Laurie Dickson
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Application granted granted Critical
Publication of FR520825A publication Critical patent/FR520825A/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)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
FR520825D 1919-08-26 1920-07-21 Improvement in microphones Expired FR520825A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2098319A GB154335A (en) 1919-08-26 1919-08-26 Improvements in or relating to microphones

Publications (1)

Publication Number Publication Date
FR520825A true FR520825A (en) 1921-07-02

Family

ID=10155165

Family Applications (1)

Application Number Title Priority Date Filing Date
FR520825D Expired FR520825A (en) 1919-08-26 1920-07-21 Improvement in microphones

Country Status (2)

Country Link
FR (1) FR520825A (en)
GB (1) GB154335A (en)

Also Published As

Publication number Publication date
GB154335A (en) 1920-11-26

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