FR747118A - Improvement in acoustic devices - Google Patents

Improvement in acoustic devices

Info

Publication number
FR747118A
FR747118A FR747118DA FR747118A FR 747118 A FR747118 A FR 747118A FR 747118D A FR747118D A FR 747118DA FR 747118 A FR747118 A FR 747118A
Authority
FR
France
Prior art keywords
improvement
acoustic devices
acoustic
devices
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.)
MICHEL ET MARCHAL
Original Assignee
MICHEL ET MARCHAL
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 MICHEL ET MARCHAL filed Critical MICHEL ET MARCHAL
Application granted granted Critical
Publication of FR747118A publication Critical patent/FR747118A/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 

Landscapes

  • Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
FR747118D 1932-03-04 1932-03-04 Improvement in acoustic devices Expired FR747118A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR747118T 1932-03-04

Publications (1)

Publication Number Publication Date
FR747118A true FR747118A (en) 1933-06-12

Family

ID=9147764

Family Applications (1)

Application Number Title Priority Date Filing Date
FR747118D Expired FR747118A (en) 1932-03-04 1932-03-04 Improvement in acoustic devices

Country Status (1)

Country Link
FR (1) FR747118A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0258948A2 (en) * 1986-09-02 1988-03-09 Magnavox Electronic Systems Company Flexural dish resonant cavity transducer

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0258948A2 (en) * 1986-09-02 1988-03-09 Magnavox Electronic Systems Company Flexural dish resonant cavity transducer
EP0258948A3 (en) * 1986-09-02 1989-05-10 Magnavox Government And Industrial Electronics Company Flexural dish resonant cavity transducer

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