A New Method for Least-Squares and Minimax Group-Delay Error Design of Allpass Variable Fractional-Delay Digital Filters

被引：0
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作者：
Cheng-Han Chan
Soo-Chang Pei
Jong-Jy Shyu
机构：
[1] Air Force Institute of Technology,Department of Aviation and Communication Electronics
[2] National Taiwan University,Department of Electrical Engineering
[3] National University of Kaohsiung,Department of Electrical Engineering
来源：
EURASIP Journal on Advances in Signal Processing | / 2010卷
关键词：
Outer Loop; Digital Filter; Comb Filter; Fractional Delay; Minimax Design;
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摘要：
A double-loop iterative method is proposed to design allpass variable fractional-delay (VFD) digital filters basing on the minimization of root-mean-squared group-delay error. In the inner loop, an iterative quadratic optimization is proposed to replace the original nonlinear optimization for the minimization of root-mean-squared group-delay error, while an iterative weighting-updated technique is applied in the outer loop to further reduce the maximum group-delay error. Several examples will be presented to demonstrate the effectiveness and good convergence of the proposed method.
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