Active noise control system using the simultaneous equation method without the estimation of error path filter coefficients

被引:19
作者
Fujii, K [1 ]
Muneyasu, M
Ohga, J
机构
[1] Fujitsu Labs Ltd, Network Syst Labs L40, Kawasaki, Kanagawa 2118588, Japan
[2] Hiroshima Univ, Fac Engn, Higashihiroshima 7398527, Japan
来源
ELECTRONICS AND COMMUNICATIONS IN JAPAN PART III-FUNDAMENTAL ELECTRONIC SCIENCE | 2002年 / 85卷 / 12期
关键词
active noise control; Filtered-x method; noise control filter; simultaneous equation method; system identification method;
D O I
10.1002/ecjc.1132
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
In an active noise control system that uses the Fittered-x method as an adaptive algorithm, the impulse response on the error path is observed and the result is assigned as a coefficient of an error path filter before the system is started. Such an impulse response can obviously change after the system is started. The change can increase the difference between the assigned coefficient and the inherent coefficient of the error path filter, and thus render the operation of noise control unstable. This paper proposes a noise control filter coefficient renewal method that does not require the calculation of an error path filter coefficient by focusing on the fact that, when a set of two different coefficients is assigned to a noise control filter, the system consisting of components from a noise detection microphone to an error detection microphone establishes two independent equations whose variables are impulse responses for the feedforward path and the error path system. The coefficient of the noise control filer can be renewed by solving the simultaneous equations by iteration. (C) 2002 Wiley Periodicals, Inc.
引用
收藏
页码:101 / 108
页数:8
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