Complex approximation of FIR digital filters by updating desired responses

被引:5
作者
Okuda, M [1 ]
Yoshida, M
Kiyose, K
Ikehara, M
Takahashi, S
机构
[1] Univ Kitakyushu, Dept Environm Engn, Fukuoka 8080135, Japan
[2] Keio Univ, Dept Sci & Technol, Kanagawa 2238522, Japan
关键词
complex approximation; equiripple design; FIR filters;
D O I
10.1109/TSP.2005.850381
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 this correspondence, we present a new numerical method for the complex approximation of FIR digital filters. Our objective is to design FIR filters whose absolute error between the designed and desired response is equiripple. The proposed method solves the least-squares problem iteratively. At each iteration, the desired response is updated so as to have an equiripple error. The proposed methods do not require any time-consuming optimization procedure such as the quasi-Newton methods and converge to equiripple solutions quickly. Moreover, by multiplying the arbitrary weighting function on the desired response of the passband and stopband, the errors in the passband and the stopband can be controlled. We show some examples to illustrate the advantages of our proposed methods.
引用
收藏
页码:2948 / 2953
页数:6
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