GB300849A - A loud speaker for radio-telephonic purposes - Google Patents

A loud speaker for radio-telephonic purposes

Info

Publication number
GB300849A
GB300849A GB7085/28A GB708528A GB300849A GB 300849 A GB300849 A GB 300849A GB 7085/28 A GB7085/28 A GB 7085/28A GB 708528 A GB708528 A GB 708528A GB 300849 A GB300849 A GB 300849A
Authority
GB
United Kingdom
Prior art keywords
radio
loud speaker
wall
armatures
telephonic purposes
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
GB7085/28A
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.)
Radiophon Co M B H
Original Assignee
Radiophon Co M B H
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 Radiophon Co M B H filed Critical Radiophon Co M B H
Publication of GB300849A publication Critical patent/GB300849A/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
    • H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only 
    • H04R1/26—Spatial arrangements of separate transducers responsive to two or more frequency ranges

Landscapes

  • Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Telephone Set Structure (AREA)

Abstract

300,849. Radiophon Co. Jan. 27, 1928, [Convention date]. No Patent granted (Sealing fee not paid). Loud - speakers ; magnetic instruments. - A loudspeaker comprises two separate telephone systems, one 1 of which is secured to a wall 3 resonant to low notes and the other 2 to a rigid support 4 opposite the wall. The telephones are placed so that diaphragms 6, 7, which are connected to the respective vibrating armatures, overlap one another. The armatures are adjusted by spindles 8, 9 coupled together and operated by a single knob 11.
GB7085/28A 1928-01-27 1928-03-07 A loud speaker for radio-telephonic purposes Expired GB300849A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE300849X 1928-01-27

Publications (1)

Publication Number Publication Date
GB300849A true GB300849A (en) 1928-11-22

Family

ID=6096373

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7085/28A Expired GB300849A (en) 1928-01-27 1928-03-07 A loud speaker for radio-telephonic purposes

Country Status (1)

Country Link
GB (1) GB300849A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0493483A1 (en) * 1989-09-18 1992-07-08 Harman International Industries, Incorporated Transducer enclosure

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0493483A1 (en) * 1989-09-18 1992-07-08 Harman International Industries, Incorporated Transducer enclosure
EP0493483A4 (en) * 1989-09-18 1992-09-02 Harman International Industries, Incorporated Transducer enclosure

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