A Method of Designing IIR Digital Filters with Maximal Flatness in Passband and Prescribed Steepness in Transition Band

Yoshiro SUHARA  Tosiro KOGA  

Publication
IEICE TRANSACTIONS (1976-1990)   Vol.E73   No.11   pp.1807-1809
Publication Date: 1990/11/25
Online ISSN: 
DOI: 
Print ISSN: 0000-0000
Type of Manuscript: Special Section LETTER (Special Issue on 1990 Autumn Natl. Conv. IEICE)
Category: Signals, Circuits and Images
Keyword: 


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Summary: 
This letter presents, as an extension of a previous work of the present authors, a design method of IIR digital filters, which is guaranteed in principle to be stable, by using the interpolation of the characteristic function of the filter for a set of prescribed values of the function and, in addition, its higher derivatives. As a numerical example, an IIR digital filter having the characteristics such that it has a maximal flatness in the passband and prescribed steepness in the transition band is designed to show the effectiveness of the proposed method.