FR906497A - Acoustic or visual warning device for the emission of sound signals - Google Patents

Acoustic or visual warning device for the emission of sound signals

Info

Publication number
FR906497A
FR906497A FR906497DA FR906497A FR 906497 A FR906497 A FR 906497A FR 906497D A FR906497D A FR 906497DA FR 906497 A FR906497 A FR 906497A
Authority
FR
France
Prior art keywords
acoustic
emission
warning device
sound signals
visual warning
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)
Inventor
Eugene-Alexandre Huguenard
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 filed Critical
Application granted granted Critical
Publication of FR906497A publication Critical patent/FR906497A/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
    • H04R21/00—Variable-resistance transducers
    • H04R21/02—Microphones
    • H04R21/021—Microphones with granular resistance material
    • 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 
    • H04R1/222—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only  for microphones

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
FR906497D 1944-02-24 1944-02-24 Acoustic or visual warning device for the emission of sound signals Expired FR906497A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR906497T 1944-02-24

Publications (1)

Publication Number Publication Date
FR906497A true FR906497A (en) 1946-01-08

Family

ID=9405727

Family Applications (1)

Application Number Title Priority Date Filing Date
FR906497D Expired FR906497A (en) 1944-02-24 1944-02-24 Acoustic or visual warning device for the emission of sound signals

Country Status (1)

Country Link
FR (1) FR906497A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE950441C (en) * 1953-03-04 1956-10-11 Dowidat Werke Willi Dowidat Device for the transmission of acoustic signals for vehicles

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE950441C (en) * 1953-03-04 1956-10-11 Dowidat Werke Willi Dowidat Device for the transmission of acoustic signals for vehicles

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