FR528513A - Telephone equipment - Google Patents

Telephone equipment

Info

Publication number
FR528513A
FR528513A FR528513A FR528513DA FR528513A FR 528513 A FR528513 A FR 528513A FR 528513 A FR528513 A FR 528513A FR 528513D A FR528513D A FR 528513DA FR 528513 A FR528513 A FR 528513A
Authority
FR
France
Prior art keywords
telephone equipment
telephone
equipment
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
FR528513A
Other languages
French (fr)
Inventor
Emile Chabault
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.)
EMILE CHABAULT
Original Assignee
EMILE CHABAULT
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 EMILE CHABAULT filed Critical EMILE CHABAULT
Application granted granted Critical
Publication of FR528513A publication Critical patent/FR528513A/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
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
    • H04R1/32—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only
    • H04R1/40—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by combining a number of identical transducers
    • H04R1/406—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by combining a number of identical transducers microphones
    • 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)
  • Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
FR528513A 1921-09-26 1920-06-29 Telephone equipment Expired FR528513A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR26494T 1921-09-26

Publications (1)

Publication Number Publication Date
FR528513A true FR528513A (en) 1921-11-14

Family

ID=8664917

Family Applications (2)

Application Number Title Priority Date Filing Date
FR528513A Expired FR528513A (en) 1921-09-26 1920-06-29 Telephone equipment
FR26494D Expired FR26494E (en) 1921-09-26 1921-09-26 Telephone equipment

Family Applications After (1)

Application Number Title Priority Date Filing Date
FR26494D Expired FR26494E (en) 1921-09-26 1921-09-26 Telephone equipment

Country Status (1)

Country Link
FR (2) FR528513A (en)

Also Published As

Publication number Publication date
FR26494E (en) 1924-01-03

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