EP 1285432 A1 20030226 - A METHOD AND A DEVICE FOR GENERATING LOW FREQUENCY SOUND AND USE OF THE DEVICE
Title (en)
A METHOD AND A DEVICE FOR GENERATING LOW FREQUENCY SOUND AND USE OF THE DEVICE
Title (de)
VERFAHREN UND VORRICHTUNG ZUR ERZEUGUNG VON NIEDERFREQUENTEM SCHALL UND VERWENDUNG DER VORRICHTUNG
Title (fr)
PROCEDE ET DISPOSITIF PERMETTANT DE GENERER DES SONS BASSE FREQUENCE ET UTILISATION DE CE DISPOSITIF
Publication
Application
Priority
- SE 0100540 W 20010316
- SE 0000863 A 20000316
Abstract (en)
[origin: WO0169588A1] In a method and a device for generating or extinguishing low frequency sound having a high sound pressure, the wave shape is divided into air pulses with variable amplitude and with considerably higher frequency than that of the wanted tone. The air pulses thereby represent instantaneous values (sampling values) of the wanted wave shape which, thus, is formed by an imaginary curve connecting the amplitude values of the discrete air pulses. The air pulses are positive during one half-cycle and negative during the other half-cycle of the wave shape. The device comprises means to pump in high frequency pulses from a chamber (1) to the surroundings during a first period of time and during a second period of time high frequency air pulses are sucked into a said chamber (2) from the surroundings. The invention also relates to use of such a device, e.g., for actively extinguishing low frequency noise.
IPC 1-7
IPC 8 full level
G10K 11/178 (2006.01); G10K 15/04 (2006.01); H04R 1/00 (2006.01)
CPC (source: EP US)
G10K 15/04 (2013.01 - EP); H04R 1/005 (2013.01 - EP US)
Designated contracting state (EPC)
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR
DOCDB simple family (publication)
WO 0169588 A1 20010920; AT E307374 T1 20051115; AU 4293201 A 20010924; DE 60114184 D1 20060302; EP 1285432 A1 20030226; EP 1285432 B1 20051019; SE 0000863 D0 20000316; SE 0000863 L 20010917; SE 518168 C2 20020903
DOCDB simple family (application)
SE 0100540 W 20010316; AT 01915988 T 20010316; AU 4293201 A 20010316; DE 60114184 T 20010316; EP 01915988 A 20010316; SE 0000863 A 20000316