GB290156A - Improvements in and relating to air sound apparatus - Google Patents

Improvements in and relating to air sound apparatus

Info

Publication number
GB290156A
GB290156A GB9002/28A GB900228A GB290156A GB 290156 A GB290156 A GB 290156A GB 9002/28 A GB9002/28 A GB 9002/28A GB 900228 A GB900228 A GB 900228A GB 290156 A GB290156 A GB 290156A
Authority
GB
United Kingdom
Prior art keywords
resonator
secondary diaphragm
diaphragms
centre
mechanical system
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
GB9002/28A
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.)
ELAC Electroacustic GmbH
Original Assignee
ELAC Electroacustic GmbH
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 ELAC Electroacustic GmbH filed Critical ELAC Electroacustic GmbH
Publication of GB290156A publication Critical patent/GB290156A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K9/00—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers
    • G10K9/18—Details, e.g. bulbs, pumps, pistons, switches or casings
    • G10K9/20—Sounding members

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Apparatuses For Generation Of Mechanical Vibrations (AREA)

Abstract

290,156. Electroacuistic Ges. May 7, 1927, [Convention date]. Magnetic instruments; diaphragms.-A sound producing apparatus comprises a main diaphragm 2 associated with a secondary diaphragm 6 through a narrow airchamber, and an open-ended resonator 7 of whistle-type located with one end close to the centre of the secondary diaphragm. The resonator if cylindrical is of length equal to an odd multiple of a quarter-wave length of the tone to be transmitted. It may, however, expand in exponential form as indicated by the dotted lines. The secondary diaphragm is of reduced width at the centre so that the air chamber is of conical form. With electromagnetic exciting means as shown, a condenser C serves for partial phase compensation and is of such value that the natural frequency of the electric circuit lies above that of the mechanical system. The frequency of the exciting alternator W lies between the two resonance peaks of the mechanical system. The diaphragms and resonator may be duplicated on either side of a central magnet, the coil of which is supported by special coil carriers secured to the sides of the casing.
GB9002/28A 1927-05-07 1928-03-24 Improvements in and relating to air sound apparatus Expired GB290156A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE290156X 1927-05-07

Publications (1)

Publication Number Publication Date
GB290156A true GB290156A (en) 1929-06-24

Family

ID=6060686

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9002/28A Expired GB290156A (en) 1927-05-07 1928-03-24 Improvements in and relating to air sound apparatus

Country Status (1)

Country Link
GB (1) GB290156A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE1019197A3 (en) * 2010-02-23 2012-04-03 Rwa Bvba SIREN SYSTEM WITH DOUBLE COMPARTMENTED HORN.

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE1019197A3 (en) * 2010-02-23 2012-04-03 Rwa Bvba SIREN SYSTEM WITH DOUBLE COMPARTMENTED HORN.

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