FR509003A - Telephone transmitter - Google Patents

Telephone transmitter

Info

Publication number
FR509003A
FR509003A FR509003A FR509003DA FR509003A FR 509003 A FR509003 A FR 509003A FR 509003 A FR509003 A FR 509003A FR 509003D A FR509003D A FR 509003DA FR 509003 A FR509003 A FR 509003A
Authority
FR
France
Prior art keywords
telephone transmitter
telephone
transmitter
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
FR509003A
Other languages
French (fr)
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.)
Thales SA
Original Assignee
Le Materiel Telephonique Thomson CSF
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 Le Materiel Telephonique Thomson CSF filed Critical Le Materiel Telephonique Thomson CSF
Application granted granted Critical
Publication of FR509003A publication Critical patent/FR509003A/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
    • H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only 
    • H04R1/222—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only  for microphones

Landscapes

  • Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
FR509003A 1919-03-29 1919-03-29 Telephone transmitter Expired FR509003A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR509003T 1919-03-29

Publications (1)

Publication Number Publication Date
FR509003A true FR509003A (en) 1920-10-29

Family

ID=8910751

Family Applications (1)

Application Number Title Priority Date Filing Date
FR509003A Expired FR509003A (en) 1919-03-29 1919-03-29 Telephone transmitter

Country Status (1)

Country Link
FR (1) FR509003A (en)

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