Title:
ACTIVE NOISE CONTROL DEVICE, ACTIVE NOISE CONTROL PROGRAM, AND ACTIVE NOISE CONTROL METHOD
Document Type and Number:
Japanese Patent JP2017049307
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide an active noise control device that correctly updates a filter coefficient even when a reverberation component remains in the impulse response of a secondary route.SOLUTION: This active noise control device has: a first microphone for receiving a noise and disposed in a pipe through which the noise propagates; a speaker for outputting a control signal to the inside of the pipe; a second microphone for receiving a sound at an opening and disposed at the opening inside the pipe; a reverberation component calculation unit for calculating an estimated reverberant sound using the control signal and the impulse response of the reverberation component of a secondary route; a reverberation component removal unit for calculating a second microphone input signal in which the estimated reverberant sound is removed from the input signal of the second microphone; and an adaptive filter unit for updating the filter coefficient and calculating a control signal using the input signal of the first microphone, the second microphone input signal in which the estimated reverberant sound is removed, a control signal at immediately preceding time of day, the impulse response of a feedback route, and the impulse response of the secondary route.SELECTED DRAWING: Figure 1
Inventors:
KAWABATA NAOYA
Application Number:
JP2015170515A
Publication Date:
March 09, 2017
Filing Date:
August 31, 2015
Export Citation:
Assignee:
OKI ELECTRIC IND CO LTD
International Classes:
G10K11/178
Domestic Patent References:
| JPH06110472A | 1994-04-22 | |||
| JPH09258761A | 1997-10-03 | |||
| JP2001057697A | 2001-02-27 | |||
| JPH0270195A | 1990-03-09 |
Attorney, Agent or Firm:
Yoshida Rintaro
Yusuke Wakabayashi
Nobuyuki Kudo
Yusuke Wakabayashi
Nobuyuki Kudo