Fractional delay filter design based on truncated lagrange interpolation

被引：54
|
作者：
Vaelimaeki, Vesa [1 ]
Haghparast, Azadeh [1 ]
机构：
[1] Aalto Univ, Lab Acoustic & Audio Signal Process, FI-02015 Espoo, Finland
来源：
IEEE SIGNAL PROCESSING LETTERS | 2007年 / 14卷 / 11期
关键词：
delay filters; finite impulse response (FIR) digital filters; interpolation; phase shifters;
D O I：
10.1109/LSP.2007.898856
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：
A new design method for fractional delay filters based on truncating the impulse response of the Lagrange interpolation filter is presented. The truncated Lagrange fractional delay filter introduces a wider approximation bandwidth than the Lagrange filter. However, because of truncation, a ripple caused by the Gibbs phenomenon appears in the filter's frequency response. Proper choices of filter order and prototype filter order allow adjusting the overshoot to a desired level and simultaneously reducing the overall frequency-response error. The design of the proposed filter is computationally efficient, because it is based on polynomial formulas, which have common terms for all coefficients.
引用
收藏
页码：816 / 819
页数：4
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