FR2164605A1 - - Google Patents

Info

Publication number
FR2164605A1
FR2164605A1 FR7243291A FR7243291A FR2164605A1 FR 2164605 A1 FR2164605 A1 FR 2164605A1 FR 7243291 A FR7243291 A FR 7243291A FR 7243291 A FR7243291 A FR 7243291A FR 2164605 A1 FR2164605 A1 FR 2164605A1
Authority
FR
France
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.)
Granted
Application number
FR7243291A
Other languages
French (fr)
Other versions
FR2164605B1 (enExample
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.)
International Business Machines Corp
Original Assignee
International Business Machines Corp
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 International Business Machines Corp filed Critical International Business Machines Corp
Publication of FR2164605A1 publication Critical patent/FR2164605A1/fr
Application granted granted Critical
Publication of FR2164605B1 publication Critical patent/FR2164605B1/fr
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 
    • H04R1/225—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only  for telephonic receivers

Landscapes

  • Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Optical Couplings Of Light Guides (AREA)
FR7243291A 1971-12-22 1972-11-29 Expired FR2164605B1 (enExample)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH1880171 1971-12-22

Publications (2)

Publication Number Publication Date
FR2164605A1 true FR2164605A1 (enExample) 1973-08-03
FR2164605B1 FR2164605B1 (enExample) 1976-08-20

Family

ID=4435367

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7243291A Expired FR2164605B1 (enExample) 1971-12-22 1972-11-29

Country Status (2)

Country Link
CH (1) CH546411A (enExample)
FR (1) FR2164605B1 (enExample)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE808593C (de) * 1949-03-10 1951-07-16 Siemens & Halske A G Kondensatormikrophon mit Richtwirkung
DE943411C (de) * 1940-06-27 1956-05-17 Eugen Beyer Tauchspulen-Mikrofon

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE943411C (de) * 1940-06-27 1956-05-17 Eugen Beyer Tauchspulen-Mikrofon
DE808593C (de) * 1949-03-10 1951-07-16 Siemens & Halske A G Kondensatormikrophon mit Richtwirkung

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
REVUE AMERICAINE "JOURNAL OF THE AUDIO ENGINEERING SOCIETY" JUILLET 1967, VOL 15, NO. 3, ARTICLE "A PRATICAL EAR ENCLOSURE WITH SELECTIVELY COUPLED VOLUME", DE ALFRED L DI MATTIA, PAGES 295 A 297. *

Also Published As

Publication number Publication date
CH546411A (de) 1974-02-28
DE2260842B2 (enExample) 1974-04-11
DE2260842A1 (de) 1973-06-28
FR2164605B1 (enExample) 1976-08-20

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Legal Events

Date Code Title Description
ST Notification of lapse