Title:
ACTIVE-NOISE-REDUCTION DEVICE, AND ACTIVE-NOISE-REDUCTION SYSTEM, MOBILE DEVICE AND ACTIVE-NOISE-REDUCTION METHOD WHICH USE SAME
Document Type and Number:
WIPO Patent Application WO/2014/002452
Kind Code:
A1
Abstract:
A reference-signal generation unit for this active-noise-reduction device outputs a vibration and a correlating reference signal to an adaptive filter unit. A filter-coefficient update unit sequentially updates a filter coefficient of the adaptive filter unit, upon receiving an input of an error signal. The error signal is created by a noise and a canceling sound based on the output of the adaptive filter unit. A detection unit detects the filter coefficient of the filter-coefficient update unit, and determines the size of the output of the adaptive filter unit. As a result, the amplitude of the canceling sound is adjusted on the basis of the adaptive-filter-unit output size which was estimated by the detection unit.
Inventors:
UENO SHOTARO
NAKAMURA YOSHIO
NAKAMURA YOSHIO
Application Number:
PCT/JP2013/003881
Publication Date:
January 03, 2014
Filing Date:
June 21, 2013
Export Citation:
Assignee:
PANASONIC CORP (JP)
International Classes:
G10K11/178; H03H21/00
Foreign References:
| JPH086573A | 1996-01-12 | |||
| JPH0764573A | 1995-03-10 | |||
| JPH09195790A | 1997-07-29 |
Attorney, Agent or Firm:
NAITO, Hiroki et al. (JP)
Hiroki Naito (JP)
Hiroki Naito (JP)
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