[go: up one dir, main page]

FR727861A - Perfectionnements aux microphones - Google Patents

Perfectionnements aux microphones

Info

Publication number
FR727861A
FR727861A FR727861DA FR727861A FR 727861 A FR727861 A FR 727861A FR 727861D A FR727861D A FR 727861DA FR 727861 A FR727861 A FR 727861A
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.)
Telefonaktiebolaget LM Ericsson AB
Original Assignee
Telefonaktiebolaget LM Ericsson AB
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 Telefonaktiebolaget LM Ericsson AB filed Critical Telefonaktiebolaget LM Ericsson AB
Application granted granted Critical
Publication of FR727861A publication Critical patent/FR727861A/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)
FR727861D 1930-12-17 1931-12-04 Perfectionnements aux microphones Expired FR727861A (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3806030A GB366221A (en) 1930-12-17 1930-12-17 Improvements in or relating to microphones

Publications (1)

Publication Number Publication Date
FR727861A true FR727861A (fr) 1932-06-25

Family

ID=10400881

Family Applications (1)

Application Number Title Priority Date Filing Date
FR727861D Expired FR727861A (fr) 1930-12-17 1931-12-04 Perfectionnements aux microphones

Country Status (2)

Country Link
FR (1) FR727861A (fr)
GB (1) GB366221A (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1003263B (de) * 1953-01-05 1957-02-28 Krone Kg Elektrodenanordnung fuer mit Kohlegriess gefuellte Sprechkapseln
CN103267153A (zh) * 2013-05-30 2013-08-28 莆田市清华园电器发展有限公司 水压力感应开关

Also Published As

Publication number Publication date
GB366221A (en) 1932-02-04

Similar Documents

Publication Publication Date Title
FR703387A (fr) Perfectionnements aux soutien-gorge
FR771454A (fr) Perfectionnements aux microphones
FR715100A (fr) Perfectionnements aux haut-parleurs
FR698003A (fr) Perfectionnements aux haut-parleurs
FR690527A (fr) Haut-parleur électrostatique
FR712387A (fr) Perfectionnements aux haut-parleurs
FR695243A (fr) Perfectionnements aux haut-parleurs
FR727861A (fr) Perfectionnements aux microphones
FR728683A (fr) Perfectionnements aux filtres
FR711055A (fr) Perfectionnements apportés aux haut-parleurs
FR722913A (fr) Perfectionnements aux haut-parleurs électrodynamiques
FR714858A (fr) Perfectionnements aux microphones
FR722393A (fr) Perfectionnements aux microphones
FR810939A (fr) Perfectionnements aux microphones
FR705658A (fr) Perfectionnements aux haut-parleurs
FR723723A (fr) Perfectionnement aux microphones
FR731938A (fr) Perfectionnements aux microphones
FR681444A (fr) Perfectionnements aux microphones
FR672533A (fr) Perfectionnements aux microphones
FR705756A (fr) Perfectionnements aux transmetteurs téléphoniques
FR659778A (fr) Perfectionnements aux microphones
FR759145A (fr) Perfectionnements aux microphones
FR763382A (fr) Perfectionnements aux microphones
FR707103A (fr) Perfectionnements aux haut-parleurs
FR700378A (fr) Perfectionnements aux hauts-parleurs