FR949759A - Poste téléphonique haut-parleur avec réflecteur parabolique - Google Patents

Poste téléphonique haut-parleur avec réflecteur parabolique

Info

Publication number
FR949759A
FR949759A FR949759DA FR949759A FR 949759 A FR949759 A FR 949759A FR 949759D A FR949759D A FR 949759DA FR 949759 A FR949759 A FR 949759A
Authority
FR
France
Prior art keywords
telephone set
parabolic reflector
loudspeaker telephone
loudspeaker
parabolic
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
English (en)
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.)
Automatic Electric Laboratories Inc
Original Assignee
Automatic Electric Laboratories Inc
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 Automatic Electric Laboratories Inc filed Critical Automatic Electric Laboratories Inc
Application granted granted Critical
Publication of FR949759A publication Critical patent/FR949759A/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; 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/60—Substation equipment, e.g. for use by subscribers including speech amplifiers
    • H04M1/6033—Substation equipment, e.g. for use by subscribers including speech amplifiers for providing handsfree use or a loudspeaker mode in telephone sets

Landscapes

  • Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Obtaining Desirable Characteristics In Audible-Bandwidth Transducers (AREA)
FR949759D 1946-08-17 1947-07-19 Poste téléphonique haut-parleur avec réflecteur parabolique Expired FR949759A (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US691279A US2483231A (en) 1946-08-17 1946-08-17 Loud-speaking telephone set with low acoustic coupling

Publications (1)

Publication Number Publication Date
FR949759A true FR949759A (fr) 1949-09-08

Family

ID=24775892

Family Applications (1)

Application Number Title Priority Date Filing Date
FR949759D Expired FR949759A (fr) 1946-08-17 1947-07-19 Poste téléphonique haut-parleur avec réflecteur parabolique

Country Status (3)

Country Link
US (1) US2483231A (enrdf_load_stackoverflow)
BE (1) BE474660A (enrdf_load_stackoverflow)
FR (1) FR949759A (enrdf_load_stackoverflow)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2580439A (en) * 1949-09-07 1952-01-01 Bell Telephone Labor Inc Directional acoustic system
US3069508A (en) * 1958-05-02 1962-12-18 Ericsson Telefon Ab L M Telephone instrument
WO2011042019A1 (en) * 2009-10-07 2011-04-14 Sl Audio A/S Dipole loudspeaker with diffuse rear radiation
JPWO2023062988A1 (enrdf_load_stackoverflow) * 2021-10-12 2023-04-20

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2114680A (en) * 1934-12-24 1938-04-19 Rca Corp System for the reproduction of sound
FR856727A (fr) * 1938-06-24 1940-08-03 Telefunken Gmbh Système permettant d'éviter les réactions acoustiques dans les installations de diffusion de parole
US2177769A (en) * 1938-12-24 1939-10-31 Frank I Du Frane Company Inc Loud-speaking intercommunicating system
US2208160A (en) * 1939-10-19 1940-07-16 Harold J Mccreary Communication system
US2381174A (en) * 1942-11-16 1945-08-07 Brush Dev Co Communication system
US2385279A (en) * 1943-01-27 1945-09-18 Bell Telephone Labor Inc Distant talking loud-speaker telephone system

Also Published As

Publication number Publication date
US2483231A (en) 1949-09-27
BE474660A (enrdf_load_stackoverflow)

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