FR771454A - Perfectionnements aux microphones - Google Patents

Perfectionnements aux microphones

Info

Publication number
FR771454A
FR771454A FR771454DA FR771454A FR 771454 A FR771454 A FR 771454A FR 771454D A FR771454D A FR 771454DA FR 771454 A FR771454 A FR 771454A
Authority
FR
France
Prior art keywords
refinements
microphone
microphone refinements
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
English (en)
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 FR771454A publication Critical patent/FR771454A/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
    • 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)
  • Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)
  • Telephone Set Structure (AREA)
  • Details Of Audible-Bandwidth Transducers (AREA)
FR771454D 1933-05-11 1934-04-09 Perfectionnements aux microphones Expired FR771454A (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US670406A US2042822A (en) 1933-05-11 1933-05-11 Telephone transmitter

Publications (1)

Publication Number Publication Date
FR771454A true FR771454A (fr) 1934-10-09

Family

ID=24690278

Family Applications (1)

Application Number Title Priority Date Filing Date
FR771454D Expired FR771454A (fr) 1933-05-11 1934-04-09 Perfectionnements aux microphones

Country Status (5)

Country Link
US (1) US2042822A (fr)
BE (1) BE402491A (fr)
DE (1) DE642693C (fr)
FR (1) FR771454A (fr)
GB (1) GB435130A (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE940654C (de) * 1944-08-15 1956-03-22 Int Standard Electric Corp Koernermikrophon

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE757629C (de) * 1938-09-09 1953-01-19 Lorenz C Ag Querstrommikrofon
DE740642C (de) * 1941-01-25 1943-10-25 Kabelindustrie Ag Kapselmikrofon mit einem aus Isolierstoff bestehenden Kapselgehaeuse
US2431022A (en) * 1942-12-21 1947-11-18 Kellogg Switchboard & Supply Telephone transmitter
BE468390A (fr) * 1943-12-28
US2494704A (en) * 1945-09-01 1950-01-17 Bell Telephone Labor Inc Microphone with fuse
US2538026A (en) * 1946-05-07 1951-01-16 Univ Loudspeakers Inc Electroacoustic transducer for actuating loud speakers
US2527159A (en) * 1947-04-26 1950-10-24 Bell Telephone Labor Inc Telephone transmitter with radial slots in the carbon chamber
NL70196C (fr) * 1947-10-31
US2532741A (en) * 1947-10-31 1950-12-05 Bell Telephone Labor Inc Microphone with opposite electrodes being of varying and constant curvature
US2609458A (en) * 1948-01-16 1952-09-02 Vigren Sten Daniel Telephone apparatus
US2585052A (en) * 1948-04-23 1952-02-12 Int Standard Electric Corp Granule type acoustic transducer
US2819351A (en) * 1955-07-21 1958-01-07 Robin Hood Co Microphone

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE940654C (de) * 1944-08-15 1956-03-22 Int Standard Electric Corp Koernermikrophon

Also Published As

Publication number Publication date
GB435130A (en) 1935-09-16
BE402491A (fr)
DE642693C (de) 1937-03-12
US2042822A (en) 1936-06-02

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