FR56275E - Bead amplifier microphone - Google Patents

Bead amplifier microphone

Info

Publication number
FR56275E
FR56275E FR56275DA FR56275E FR 56275 E FR56275 E FR 56275E FR 56275D A FR56275D A FR 56275DA FR 56275 E FR56275 E FR 56275E
Authority
FR
France
Prior art keywords
amplifier microphone
bead amplifier
bead
microphone
amplifier
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
Edmond Arrin
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 filed Critical
Application granted granted Critical
Publication of FR56275E publication Critical patent/FR56275E/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
    • 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

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
FR56275D 1944-01-19 1944-05-22 Bead amplifier microphone Expired FR56275E (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR988891T 1944-01-19

Publications (1)

Publication Number Publication Date
FR56275E true FR56275E (en) 1952-09-22

Family

ID=9539817

Family Applications (3)

Application Number Title Priority Date Filing Date
FR988891D Expired FR988891A (en) 1944-01-19 1944-01-19 Bead amplifier microphone
FR56275D Expired FR56275E (en) 1944-01-19 1944-05-22 Bead amplifier microphone
FR56315D Expired FR56315E (en) 1944-01-19 1944-11-20 Bead amplifier microphone

Family Applications Before (1)

Application Number Title Priority Date Filing Date
FR988891D Expired FR988891A (en) 1944-01-19 1944-01-19 Bead amplifier microphone

Family Applications After (1)

Application Number Title Priority Date Filing Date
FR56315D Expired FR56315E (en) 1944-01-19 1944-11-20 Bead amplifier microphone

Country Status (1)

Country Link
FR (3) FR988891A (en)

Also Published As

Publication number Publication date
FR988891A (en) 1951-09-03
FR56315E (en) 1952-09-22

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