EP 0008274 A1 19800220 - Unidirectional acoustical enclosure.
Title (en)
Unidirectional acoustical enclosure.
Title (de)
Unidirektionales akustisches Gehäuse.
Title (fr)
Enceinte acoustique unidirectionnelle.
Publication
Application
Priority
FR 7823848 A 19780816
Abstract (en)
[origin: ES483380A1] A unidirectional speaker enclosure has a cylindrical cabinet supporting a speaker at its front end and having a closed bottom at its rear end. The front end constitutes a main aperture surrounded concentrically by a secondary aperture communicating with the rear face of the speaker membrane through two relatively large resonance chambers formed by two cylinders disposed concentrically within the cylindrical cabinet. The arrangement is such that a lag corresponding to a wavelength of the desired critical frequency is obtained between the backward wave and the forward wave produced by the speaker membrane.
Abstract (fr)
L'invention concerne une enceinte acoustique unidirectionnelle. Elle est caractérisée par le fait que le caisson (1) est de forme cylindrique, rigide, comporte également une unique ouverture secondaire (8) à proximité immédiate de l'ouverture principale (7); des moyens de séparation (16), rigides, sont placés dans le caisson (1) et définissent dans celui-ci une chambre (17) de canalisation de l'air entre la face arrière (18) de la membrane (13) du haut-parleur et l'ouverture secondaire (8). L'invention s'applique en radiophonie.
IPC 1-7
IPC 8 full level
CPC (source: EP US)
H04R 1/345 (2013.01 - EP US)
Citation (search report)
- US 3122215 A 19640225 - SUTTON EUGENE E
- US 3327808 A 19670627 - SHAPER HARRY B
- US 3638753 A 19720201 - CUNNINGHAM PAUL E
- FR 2127283 A5 19721013 - FARRACHE JEAN
- FR 843643 A 19390706 - MATERIEL TELEPHONIQUE
Designated contracting state (EPC)
AT BE CH DE GB IT LU NL SE
DOCDB simple family (publication)
EP 0008274 A1 19800220; EP 0008274 B1 19830803; AT E4405 T1 19830815; DE 2966021 D1 19830908; ES 483380 A1 19800616; FR 2433879 A1 19800314; FR 2433879 B1 19831028; US 4298087 A 19811103
DOCDB simple family (application)
EP 79400564 A 19790810; AT 79400564 T 19790810; DE 2966021 T 19790810; ES 483380 A 19790814; FR 7823848 A 19780816; US 6653979 A 19790815