Title:
ACTIVE NOISE CONTROLLER
Document Type and Number:
Japanese Patent JP3364325
Kind Code:
B2
Abstract:
PURPOSE: To reduce an operation quantity at the time of filter coefficient renewal without deteriorating a convergence speed in an active controller controlling a filter coefficient of a transversal filter so as to minimize a remaining noise while suppressing a gain increase in a specific frequency band.
CONSTITUTION: In the coefficient renewal of the transversal filter 6 inputting a noise signal (u) and outputting a control signal (y), an addition signal r+ and a difference signal r between a reference signal r1 related to the minimization of the remaining noise and the reference signal r2 related to gain suppression are formed. Further, the addition signal e+ and the difference signal e- between an error signal e1 related to the minimization of the remaining noise and the error signal e, related to the gain suppression are formed, and a set of the addition signals r+, e+ and the set of the difference signals r-, e- are used alternately at every sampling, and the coefficient of the transversal filter 6 is updated by a coefficient renewal part.
Inventors:
Masaki Eguchi
Application Number:
JP15712294A
Publication Date:
January 08, 2003
Filing Date:
July 08, 1994
Export Citation:
Assignee:
Sharp Corporation
International Classes:
F01N1/06; G10K11/178; H03H21/00; (IPC1-7): G10K11/178; F01N1/06; H03H21/00
Domestic Patent References:
| JP567948A | ||||
| JP4358712A | ||||
| JP619482A |
Attorney, Agent or Firm:
Shizuo Sano
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