FR1086665A - Sound transmission device from noisy rooms - Google Patents

Sound transmission device from noisy rooms

Info

Publication number
FR1086665A
FR1086665A FR1086665DA FR1086665A FR 1086665 A FR1086665 A FR 1086665A FR 1086665D A FR1086665D A FR 1086665DA FR 1086665 A FR1086665 A FR 1086665A
Authority
FR
France
Prior art keywords
transmission device
sound transmission
noisy
rooms
noisy rooms
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
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.)
Koninklijke Philips NV
Original Assignee
Philips Gloeilampenfabrieken NV
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 Philips Gloeilampenfabrieken NV filed Critical Philips Gloeilampenfabrieken NV
Application granted granted Critical
Publication of FR1086665A publication Critical patent/FR1086665A/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
    • H04R7/00—Diaphragms for electromechanical transducers; Cones
    • H04R7/02—Diaphragms for electromechanical transducers; Cones characterised by the construction
    • H04R7/12—Non-planar diaphragms or cones
    • H04R7/127—Non-planar diaphragms or cones dome-shaped
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/58—Anti-side-tone circuits
    • 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
    • H04R1/08—Mouthpieces; Microphones; Attachments therefor
    • H04R1/083—Special constructions of mouthpieces

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
FR1086665D 1952-11-07 1953-11-06 Sound transmission device from noisy rooms Expired FR1086665A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE321708X 1952-11-07

Publications (1)

Publication Number Publication Date
FR1086665A true FR1086665A (en) 1955-02-15

Family

ID=6162943

Family Applications (1)

Application Number Title Priority Date Filing Date
FR1086665D Expired FR1086665A (en) 1952-11-07 1953-11-06 Sound transmission device from noisy rooms

Country Status (4)

Country Link
BE (1) BE524124A (en)
CH (1) CH321708A (en)
FR (1) FR1086665A (en)
NL (2) NL86513C (en)

Also Published As

Publication number Publication date
CH321708A (en) 1957-05-15
NL86513C (en)
BE524124A (en)
NL182555B (en)

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