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

作者：Lai, Xiaoping^*; Lai, Chunlu; Zhao, Ruijie

来源：IEEE Signal Processing Letters, 2011, 18(2): 107-110.

DOI：10.1109/LSP.2010.2099217

• FIR filters
• frequency-response error
• group-delay error
• minimax design
• phase error

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.

• 出版日期2011-2
• 单位山东大学; 杭州电子科技大学