EP 0973151 B8 20090225 - Noise control system
Title (en)
Noise control system
Title (de)
Lärmkontrolleanordnung
Title (fr)
Arrangement de contrôle du bruit
Publication
Application
Priority
- JP 20236398 A 19980716
- JP 15877599 A 19990604
- JP 15877699 A 19990604
Abstract (en)
[origin: EP0973151A2] A noise control system includes: a control sound generator (1) for generating a control sound; an error detector (2) for detecting an error signal between the control sound and noise; a noise detector (3) for detecting a noise source signal; an adaptive filter (4) for outputting a control signal; and a coefficient updator for updating a coefficient of the adaptive filter (4). The coefficient updator includes at least a first digital filter (5), a first coefficient update calculator (6), a second digital filter (7), a phase inverter (10), a third digital filter (8), and a second coefficient update calculator (9). Alternatively, the coefficient updator includes at least a first digital filter, a second digital filter, a third digital filter, a coefficient update calculator, a phase inverter, a first adder, and a second adder. In either case, the coefficient updator has a function of suppressing an increase in a coefficient gain of the adaptive filter in a predetermined frequency band. <IMAGE>
IPC 8 full level
G10K 11/178 (2006.01)
CPC (source: EP US)
G10K 11/17825 (2017.12 - EP US); G10K 11/17833 (2017.12 - EP US); G10K 11/17854 (2017.12 - EP US); G10K 11/17881 (2017.12 - EP US); G10K 2210/3012 (2013.01 - EP US); G10K 2210/3027 (2013.01 - EP US); G10K 2210/3039 (2013.01 - EP US)
Designated contracting state (EPC)
DE FR GB
DOCDB simple family (publication)
EP 0973151 A2 20000119; EP 0973151 A3 20030102; EP 0973151 B1 20081029; EP 0973151 B8 20090114; EP 0973151 B8 20090225; DE 69939796 D1 20081211; US 6418228 B1 20020709
DOCDB simple family (application)
EP 99113651 A 19990714; DE 69939796 T 19990714; US 35366799 A 19990715