EP 0586831 A3 19940330 -
Publication
Application
Priority
DE 4226885 A 19920813
Abstract (en)
[origin: EP0586831A2] In a sound absorption method for motor vehicles, in which a loudspeaker is used to produce sound pressure values and in which a Helmholtz resonator (AHR) is used to absorb sound pressure at the resonant frequency of the resonator, the loudspeaker (L) mounted in the cavity (H) of the Helmholtz resonator (AHR) is used to generate sound pressure values in the cavity (H) by means of which an arbitrary number of cavity volumes deviating from the real cavity volume are simulated simultaneously or in temporal sequence. The cavity volumes to be simulated are determined on the basis of arbitrary desired resonant frequencies for the Helmholtz resonator (AHR). <IMAGE>
IPC 1-7
IPC 8 full level
G10K 11/16 (2006.01); G10K 11/172 (2006.01)
CPC (source: EP)
G10K 11/172 (2013.01); G10K 2210/32272 (2013.01)
Citation (search report)
- [XY] EP 0454341 A2 19911030 - FORD MOTOR CO [GB], et al
- [Y] US 5119427 A 19920602 - HERSH ALAN S [US], et al
- [Y] EP 0342353 A2 19891123 - BAYERISCHE MOTOREN WERKE AG [DE]
Designated contracting state (EPC)
DE FR GB IT
DOCDB simple family (publication)
DE 4226885 A1 19940217; DE 4226885 C2 20010419; DE 59308951 D1 19981008; EP 0586831 A2 19940316; EP 0586831 A3 19940330; EP 0586831 B1 19980902
DOCDB simple family (application)
DE 4226885 A 19920813; DE 59308951 T 19930713; EP 93111202 A 19930713