EP 0697122 B1 19991208 - NOISE ATTENUATION DEVICE WITH ACTIVE DOUBLE WALL
Title (en)
NOISE ATTENUATION DEVICE WITH ACTIVE DOUBLE WALL
Title (de)
SCHALLDÄMPFUNGSANORDNUNG MIT AKTIVER DOPPELWAND
Title (fr)
DISPOSITIF D'ATTENUATION ACOUSTIQUE A DOUBLE PAROI ACTIVE
Publication
Application
Priority
- FR 9400520 W 19940504
- FR 9305451 A 19930506
Abstract (en)
[origin: US5724432A] PCT No. PCT/FR94/00520 Sec. 371 Date Feb. 15, 1996 Sec. 102(e) Date Feb. 15, 1996 PCT Filed May 4, 1994 PCT Pub. No. WO94/27283 PCT Pub. Date Nov. 24, 1994An active double wall comprises two parallel plates defining a rectangular space. Four sensors are positioned between the plates so as to detect noises in said space, and four actuators are placed between the plates to emit counter-noises in the space. The actuators are phase-controlled by a control unit in order to minimize the sum of the outputs of the sensors. The actuators are respectively positioned at the centers of the sides of the rectangular space, and the sensors are respectively positioned at the centers of the sides of a rhombus whose vertices are the respective centers of the sides of the rectangular space, or vice-versa.
IPC 1-7
IPC 8 full level
G10K 11/178 (2006.01)
CPC (source: EP US)
G10K 11/17854 (2018.01 - EP US); G10K 11/17857 (2018.01 - EP US); G10K 11/17881 (2018.01 - EP US); G10K 2210/102 (2013.01 - EP US); G10K 2210/106 (2013.01 - EP US); G10K 2210/129 (2013.01 - EP US); G10K 2210/1291 (2013.01 - EP US); G10K 2210/3036 (2013.01 - EP US); G10K 2210/3046 (2013.01 - EP US); G10K 2210/3219 (2013.01 - EP US); G10K 2210/3223 (2013.01 - EP US)
Designated contracting state (EPC)
AT BE CH DE ES FR GB IT LI NL
DOCDB simple family (publication)
US 5724432 A 19980303; AT E187570 T1 19991215; DE 69422036 D1 20000113; EP 0697122 A1 19960221; EP 0697122 B1 19991208; FR 2704969 A1 19941110; FR 2704969 B1 19950728; WO 9427283 A1 19941124
DOCDB simple family (application)
US 53506796 A 19960215; AT 94915585 T 19940504; DE 69422036 T 19940504; EP 94915585 A 19940504; FR 9305451 A 19930506; FR 9400520 W 19940504