CH207805A - Kohleelektrode für Mikrophone. - Google Patents

Kohleelektrode für Mikrophone.

Info

Publication number
CH207805A
CH207805A CH207805DA CH207805A CH 207805 A CH207805 A CH 207805A CH 207805D A CH207805D A CH 207805DA CH 207805 A CH207805 A CH 207805A
Authority
CH
Switzerland
Prior art keywords
microphones
carbon electrode
electrode
carbon
Prior art date
Application number
Other languages
English (en)
Inventor
Fides Gesellschaft Beschraenk
Original Assignee
Fides Gmbh
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 Fides Gmbh filed Critical Fides Gmbh
Publication of CH207805A publication Critical patent/CH207805A/de

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
    • H04R21/021—Microphones with granular resistance material

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Details Of Audible-Bandwidth Transducers (AREA)
  • Piezo-Electric Transducers For Audible Bands (AREA)
CH207805D 1937-10-04 1938-10-04 Kohleelektrode für Mikrophone. CH207805A (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE207805X 1937-10-04

Publications (1)

Publication Number Publication Date
CH207805A true CH207805A (de) 1939-11-30

Family

ID=5793895

Family Applications (1)

Application Number Title Priority Date Filing Date
CH207805D CH207805A (de) 1937-10-04 1938-10-04 Kohleelektrode für Mikrophone.

Country Status (3)

Country Link
CH (1) CH207805A (de)
FR (1) FR840295A (de)
GB (1) GB518999A (de)

Also Published As

Publication number Publication date
GB518999A (en) 1940-03-13
FR840295A (fr) 1939-04-21

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