FR561688A - Loudspeaker for telephony and cordless telephony - Google Patents

Loudspeaker for telephony and cordless telephony

Info

Publication number
FR561688A
FR561688A FR561688DA FR561688A FR 561688 A FR561688 A FR 561688A FR 561688D A FR561688D A FR 561688DA FR 561688 A FR561688 A FR 561688A
Authority
FR
France
Prior art keywords
telephony
loudspeaker
cordless
cordless telephony
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.)
HINSTIN P
LEHMANN L ELECTRO MATERIEL A
Original Assignee
HINSTIN P
LEHMANN L ELECTRO MATERIEL A
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 HINSTIN P, LEHMANN L ELECTRO MATERIEL A filed Critical HINSTIN P
Application granted granted Critical
Publication of FR561688A publication Critical patent/FR561688A/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)
FR561688D 1923-02-02 1923-02-02 Loudspeaker for telephony and cordless telephony Expired FR561688A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR561688T 1923-02-02

Publications (1)

Publication Number Publication Date
FR561688A true FR561688A (en) 1923-10-26

Family

ID=8943779

Family Applications (1)

Application Number Title Priority Date Filing Date
FR561688D Expired FR561688A (en) 1923-02-02 1923-02-02 Loudspeaker for telephony and cordless telephony

Country Status (1)

Country Link
FR (1) FR561688A (en)

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