Title:
能動型騒音制御装置
Document Type and Number:
Japanese Patent JP5359305
Kind Code:
B2
Abstract:
An active noise control apparatus includes a control frequency detector for determining a control frequency which is a frequency of a noise to be controlled, a sine-wave generator for generating a reference sine-wave signal having the determined control frequency, a cosine-wave generator for generating a reference cosine-wave signal having the determined control frequency, a first one-tap digital filter for outputting a first control signal obtained by multiplying the reference sine-wave signal by a first filter coefficient, a second one-tap digital filter for outputting a second control signal obtained by multiplying the reference cosine-wave signal by a second filter coefficient, an interference signal generator for generating an interference signal based on a noise control signal obtained by summing the first control signal and the second control signal, an error signal detector for detecting an error signal produced due to an interference between the interference signal and the noise, first and second coefficient updating units for updating the first and second filter coefficients according to the error signal, and a control frequency corrector for correcting the control frequency according to the first and second filter coefficients. This active noise control apparatus can reduce a noise effectively even if the control frequency shifts from the frequency of a noise actually generated.
Inventors:
Tsutomu Matono
Yukio Nakamura
Yukio Nakamura
Application Number:
JP2009010555A
Publication Date:
December 04, 2013
Filing Date:
January 21, 2009
Export Citation:
Assignee:
Panasonic Corporation
International Classes:
B60R11/02; G10K11/178
Domestic Patent References:
| JP2008040411A | ||||
| JP2008260420A | ||||
| JP2007269050A | ||||
| JP2008062804A | ||||
| JP2004361721A |
Attorney, Agent or Firm:
Hiroki Naito
Kentaro Fujii
Ikuro Terauchi
Kentaro Fujii
Ikuro Terauchi