Minimax approximation of minimum phase FIR filters

This paper presents a directly design method of FIR filters with minimum phase characteristics using successive projections (SP) method. We use Rouche´s theorem for coefficients update algorithm in SP method to restrict the roots of transfer function inside the unit circle and on the unit circle. The proposed method is an iterative optimization technique and its algorithm is as simple as the conventional SP method. The usefulness of the proposed method is verified through the examples.