EP 1084589 A1 20010321 - PNEUMATICALLY DRIVEN LOUDSPEAKER AND ITS USE
Title (en)
PNEUMATICALLY DRIVEN LOUDSPEAKER AND ITS USE
Title (de)
DRUCKLUFTGETRIEBENER LAUTSPRECHER UND DESSEN VERWENDUNG
Title (fr)
HAUT-PARLEUR PNEUMATIQUE ET UTILISATION DE CELUI-CI
Publication
Application
Priority
- SE 9900586 W 19990409
- SE 9801257 A 19980409
Abstract (en)
[origin: WO9953720A1] The invention presented here refers to a pneumatically driven loudspeaker, comprising at least one first chamber (1, 62) having higher pressure than the surroundings and with at least one first opening (8, 61) to the surroundings. The loudspeaker in addition comprises a second chamber (2, 64) with lower pressure than the surroundings and with at least one second opening (9, 63) to the surroundings. The first and the second openings can by means of valve mechanisms (3, 65, 91, 92) alternately open and close at a selected frequency, resulting in pressure fluctuations which give rise to sound of the desired frequency. The loudspeaker according to the invention can be used in hi-fi applications as well as in active noise suppression in jet engines, in ventilation systems, in gas turbine outlets and in exhaust systems in combustion engines.
IPC 1-7
IPC 8 full level
G10K 7/00 (2006.01)
CPC (source: EP)
G10K 7/00 (2013.01)
Citation (search report)
See references of WO 9953720A1
Designated contracting state (EPC)
CH DE FR GB IT LI
DOCDB simple family (publication)
WO 9953720 A1 19991021; AU 4176799 A 19991101; DE 69920445 D1 20041028; EP 1084589 A1 20010321; EP 1084589 B1 20040922; SE 9801257 D0 19980409
DOCDB simple family (application)
SE 9900586 W 19990409; AU 4176799 A 19990409; DE 69920445 T 19990409; EP 99925504 A 19990409; SE 9801257 A 19980409