FR648240A - - Google Patents

Info

Publication number
FR648240A
FR648240A FR648240DA FR648240A FR 648240 A FR648240 A FR 648240A FR 648240D A FR648240D A FR 648240DA FR 648240 A FR648240 A FR 648240A
Authority
FR
France
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)
Publication date
Application granted granted Critical
Publication of FR648240A publication Critical patent/FR648240A/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; ELECTRIC HEARING AIDS; 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 
    • H04R1/30—Combinations of transducers with horns, e.g. with mechanical matching means, i.e. front-loaded horns

Landscapes

  • Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
FR648240D Expired FR648240A (cg-RX-API-DMAC10.html)

Publications (1)

Publication Number Publication Date
FR648240A true FR648240A (cg-RX-API-DMAC10.html) 1928-12-06

Family

ID=1542856

Family Applications (1)

Application Number Title Priority Date Filing Date
FR648240D Expired FR648240A (cg-RX-API-DMAC10.html)

Country Status (1)

Country Link
FR (1) FR648240A (cg-RX-API-DMAC10.html)

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