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FR906904A - Acoustic device - Google Patents

Acoustic device

Info

Publication number
FR906904A
FR906904A FR906904DA FR906904A FR 906904 A FR906904 A FR 906904A FR 906904D A FR906904D A FR 906904DA FR 906904 A FR906904 A FR 906904A
Authority
FR
France
Prior art keywords
acoustic device
acoustic
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 FR906904A publication Critical patent/FR906904A/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 
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R11/00—Transducers of moving-armature or moving-core type
    • H04R11/02—Loudspeakers

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Electromagnetism (AREA)
  • Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
FR906904D 1943-09-08 1944-09-06 Acoustic device Expired FR906904A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL906904X 1943-09-08

Publications (1)

Publication Number Publication Date
FR906904A true FR906904A (en) 1946-02-25

Family

ID=19858636

Family Applications (1)

Application Number Title Priority Date Filing Date
FR906904D Expired FR906904A (en) 1943-09-08 1944-09-06 Acoustic device

Country Status (2)

Country Link
BE (1) BE457498A (en)
FR (1) FR906904A (en)

Also Published As

Publication number Publication date
BE457498A (en)

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