Figure 3From: A New Method for Least-Squares and Minimax Group-Delay Error Design of Allpass Variable Fractional-Delay Digital FiltersDesign of an , allpass VFD filter. (a) Group-delay responses. (b) Absolute group-delay errors (left: Deng's LS design, right: proposed LS design). (c) Absolute phase errors (left: Deng's LS design, right: proposed LS design). (d) Absolute group-delay errors of the proposed minimax design. (e) Maximum pole radius for .Back to article page