Abstract

FERNANDEZ VAZQUEZ, Alfonso  and  JOVANOVIC DOLECEK, Gordana. Design of Linear Phase IIR Filters with Flat Magnitude Response using Complex Coefficients Allpole Filters. Comp. y Sist. [online]. 2007, vol.10, n.4, pp.335-356. ISSN 2007-9737.

This paper presents a new method for the design of linear phase IIR filters with flat magnitude response. The method is based on the design of flat digital allpole filters with complex coefficients. Depending on the parity of the allpole filter order the resulting IIR filter have either real or complex coefficients. The parameters of the design are the same as in traditional IIR filter design, i.e., passband and stopband frequencies, ω_p and ω_s, passband droop A_p , and stopband attenuation A_s . Several design examples are provided to illustrate the method. In addition, a design of linear phase modified two-band IIR filter banks and a design of stable IIR filter with an improved group delay are presented as two applications of the proposed method.

Keywords : IIR filters; linear phase; allpole filters; allpass filters; filter banks; improved group delay.

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