GB322177A - Improvements in sound-reproducing apparatus - Google Patents

Improvements in sound-reproducing apparatus

Info

Publication number
GB322177A
GB322177A GB2896629A GB2896629A GB322177A GB 322177 A GB322177 A GB 322177A GB 2896629 A GB2896629 A GB 2896629A GB 2896629 A GB2896629 A GB 2896629A GB 322177 A GB322177 A GB 322177A
Authority
GB
United Kingdom
Prior art keywords
chamber
sound
reflector
diaphragm
cone
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
GB2896629A
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.)
COLUMBIA GRAPHOPHONE CO Ltd
Original Assignee
COLUMBIA GRAPHOPHONE CO Ltd
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 COLUMBIA GRAPHOPHONE CO Ltd filed Critical COLUMBIA GRAPHOPHONE CO Ltd
Publication of GB322177A publication Critical patent/GB322177A/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 
    • H04R1/30—Combinations of transducers with horns, e.g. with mechanical matching means, i.e. front-loaded horns
    • 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)
  • Obtaining Desirable Characteristics In Audible-Bandwidth Transducers (AREA)
  • Details Of Audible-Bandwidth Transducers (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)

Abstract

322,177. Columbia Graphophone Co., Ltd., Forse, W. T., and Mitchell, F. A. July 23, 1928. Divided on 320,873. Loud-speakers; magnetic instruments; diaphragms.-A sound-reproducing device comprises a diaphragm D operated electromagnetically and an acoustic amplifying chamber H on one wall of which the diaphragm is mounted so as to project sound on to a reflecting surface arranged within or forming one wall R of the chamber. The small end O of the chamber H is left open to prevent resonance and the reflector R is preferably at 45‹ to the axis of the cone. The acoustic chamber and reflector may assume other shapes. The centering means for the moving coil and its relation to the cone are as described in Specification 320,873. Specifications 300,679, and 321,644, [both in Class 40 (v), Wireless signalling &c.], also are. referred to.
GB2896629A 1928-07-23 1928-07-23 Improvements in sound-reproducing apparatus Expired GB322177A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2132228A GB320873A (en) 1928-07-23 1928-07-23 Improvements in sound-reproducing apparatus

Publications (1)

Publication Number Publication Date
GB322177A true GB322177A (en) 1929-11-25

Family

ID=10160914

Family Applications (2)

Application Number Title Priority Date Filing Date
GB2132228A Expired GB320873A (en) 1928-07-23 1928-07-23 Improvements in sound-reproducing apparatus
GB2896629A Expired GB322177A (en) 1928-07-23 1928-07-23 Improvements in sound-reproducing apparatus

Family Applications Before (1)

Application Number Title Priority Date Filing Date
GB2132228A Expired GB320873A (en) 1928-07-23 1928-07-23 Improvements in sound-reproducing apparatus

Country Status (1)

Country Link
GB (2) GB320873A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0116421A1 (en) * 1983-02-04 1984-08-22 George P. Sadorus Reflective audio assembly and picture
USD386205S (en) 1996-10-24 1997-11-11 Cassandra Wylene Headen Greeting card

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0116421A1 (en) * 1983-02-04 1984-08-22 George P. Sadorus Reflective audio assembly and picture
US4541188A (en) * 1983-02-04 1985-09-17 Talkies International Corp. Reflective audio assembly and picture
USD386205S (en) 1996-10-24 1997-11-11 Cassandra Wylene Headen Greeting card

Also Published As

Publication number Publication date
GB320873A (en) 1929-10-23

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