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Estimation of the linear-phase IIR filter order based on FIR prototype with prescribed group delay

Konopacki J., Mościńska K.

International Journal of Microelectronics and Computer Science

2014

Vol. 5, nr 3

105--110

Known methods for IIR digital ﬁlters design require speciﬁcation of ﬁlter order. In case of direct methods applied for ﬁlters with the prescribed linear phase response, the order cannot be derived from the speciﬁed ﬁlter parameters. The authors propose a procedure for ﬁlter order estimation, based on design of the FIR ﬁlter prototype, with the same design parameters. Two examples demonstrate application of the proposed procedure for ﬁlter design tasks. Comparison of the ﬁlter order obtained by the discussed approach with the real value has been also presented.

A Procedure for Quasi-Equiripple Linear-Phase IIR Filters Design

Konopacki J., Mościńska K.

International Journal of Electronics and Telecommunications

2010

Vol. 56, No. 4

393-398

The linear-phase IIR filters are described in many cases, mainly due to distortion-free transmission of signals. One of the major problems of IIR filter design is stability, which can be obtained with suitable value of group delay τ This paper concerns calculation of filter order Ν and group delay τ in case of quasi-equiripple design of IIR filters. We propose a novel procedure for determining N and τ values; the procedure is valid for all types of filters with arbitrary number of zeros and a few non-zero poles. Evaluation of the proposed approach as well as examples illustrating its application are provided in the paper.