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An Iterative Approach to Near-Uniform Group-Delay Error Design of FIR Filters

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3 Author(s)
Xiaoping Lai ; Inst. of Inf. & Control, Hangzhou Dianzi Univ., Hangzhou, China ; Chunlu Lai ; Ruijie Zhao

For a minimax finite impulse response filter, the group-delay error near the bandedges of the filter is usually much larger than the error elsewhere. A sigmoid function was recently introduced as a phase-error upper-bound function to effectively reduce the group-delay error near the bandedge. However, the manual selection of the function's parameters limits its flexible use in the design. This letter presents an iterative procedure to update the phase-error upper-bound function using a modified envelope of the absolute group-delay error, such that the resulting filter has near-uniform group-delay error, and thus to reduce the maximum group-delay error. Design examples demonstrate the effectiveness of the proposed iterative procedure.

Published in:

Signal Processing Letters, IEEE  (Volume:18 ,  Issue: 2 )

Date of Publication:

Feb. 2011

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