FR613059A - Improvements to loudspeaker telephone receivers - Google Patents

Improvements to loudspeaker telephone receivers

Info

Publication number
FR613059A
FR613059A FR613059DA FR613059A FR 613059 A FR613059 A FR 613059A FR 613059D A FR613059D A FR 613059DA FR 613059 A FR613059 A FR 613059A
Authority
FR
France
Prior art keywords
telephone receivers
loudspeaker telephone
loudspeaker
receivers
telephone
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
Edward Alfred Graham
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 FR613059A publication Critical patent/FR613059A/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
    • H04R1/32—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only
    • H04R1/34—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by using a single transducer with sound reflecting, diffracting, directing or guiding means
    • H04R1/345—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by using a single transducer with sound reflecting, diffracting, directing or guiding means for loudspeakers

Landscapes

  • Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
FR613059D 1925-04-04 1926-03-20 Improvements to loudspeaker telephone receivers Expired FR613059A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB613059X 1925-04-04

Publications (1)

Publication Number Publication Date
FR613059A true FR613059A (en) 1926-11-08

Family

ID=10486848

Family Applications (1)

Application Number Title Priority Date Filing Date
FR613059D Expired FR613059A (en) 1925-04-04 1926-03-20 Improvements to loudspeaker telephone receivers

Country Status (2)

Country Link
BE (1) BE333007A (en)
FR (1) FR613059A (en)

Also Published As

Publication number Publication date
BE333007A (en)

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