FR804178A - Device for coupling, with a telephone receiver, a microphone such as, in particular, that of an electroacoustic device for the deaf - Google Patents

Device for coupling, with a telephone receiver, a microphone such as, in particular, that of an electroacoustic device for the deaf

Info

Publication number
FR804178A
FR804178A FR804178DA FR804178A FR 804178 A FR804178 A FR 804178A FR 804178D A FR804178D A FR 804178DA FR 804178 A FR804178 A FR 804178A
Authority
FR
France
Prior art keywords
deaf
microphone
coupling
telephone receiver
electroacoustic
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
Jules Lefevre
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 FR804178A publication Critical patent/FR804178A/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
    • H04R27/00—Public address systems
    • H04R27/02—Amplifying systems for the deaf

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
FR804178D 1935-07-11 1935-07-11 Device for coupling, with a telephone receiver, a microphone such as, in particular, that of an electroacoustic device for the deaf Expired FR804178A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR804178T 1935-07-11

Publications (1)

Publication Number Publication Date
FR804178A true FR804178A (en) 1936-10-17

Family

ID=9250600

Family Applications (1)

Application Number Title Priority Date Filing Date
FR804178D Expired FR804178A (en) 1935-07-11 1935-07-11 Device for coupling, with a telephone receiver, a microphone such as, in particular, that of an electroacoustic device for the deaf

Country Status (1)

Country Link
FR (1) FR804178A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2544027A (en) * 1948-07-16 1951-03-06 Raymond E King Hearing aid attachment for use on french type telephones

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2544027A (en) * 1948-07-16 1951-03-06 Raymond E King Hearing aid attachment for use on french type telephones

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