Design of FIR filters using variable window families: A comparative study

Abstract

In this paper, we report the design equations for FIR filter synthesis by using some recently reported combinational window functions. The performance of these filters is compared with FIR filters designed by using Kaiser window (prolate spheroidal wave function based). We also suggest some corrections in the set of design equations for FIR filter synthesis by using raised cosine window. The variable window functions used in this study other than Kaiser and raised cosine window provide filters with better side lobe fall off rate. This feature can be utilized for better suppression of images associated with interpolators.