FR672533A - Microphone refinements - Google Patents

Microphone refinements

Info

Publication number
FR672533A
FR672533A FR672533DA FR672533A FR 672533 A FR672533 A FR 672533A FR 672533D A FR672533D A FR 672533DA FR 672533 A FR672533 A FR 672533A
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)
Inventor
John Harry Dunn Ridley
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.)
BURNDEPT WIRELESS 1928 Ltd
Original Assignee
BURNDEPT WIRELESS 1928 Ltd
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 BURNDEPT WIRELESS 1928 Ltd filed Critical BURNDEPT WIRELESS 1928 Ltd
Application granted granted Critical
Publication of FR672533A publication Critical patent/FR672533A/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
    • H04R21/026—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)
FR672533D 1929-04-04 1929-04-04 Microphone refinements Expired FR672533A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR672533T 1929-04-04

Publications (1)

Publication Number Publication Date
FR672533A true FR672533A (en) 1929-12-30

Family

ID=9017538

Family Applications (1)

Application Number Title Priority Date Filing Date
FR672533D Expired FR672533A (en) 1929-04-04 1929-04-04 Microphone refinements

Country Status (1)

Country Link
FR (1) FR672533A (en)

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