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Computer-aided design of stable recursive digital filters from magnitude specifications

✍ Scribed by K. P. Prasad; P. S. Reddy

Publisher: John Wiley and Sons
Year: 1979
Tongue: English
Weight: 308 KB
Volume: 7
Category: Article
ISSN: 0098-9886
DOI: 10.1002/cta.4490070113

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✦ Synopsis

This paper presents a method of designing one-and two-dimensional recursive digital filters making use of the properties of bilinear transformation of strictly Hurwitz polynomials. The result is a stable digital filter in both oneand two-dimensional cases, which requires no further testing for stability. The well known unconstrained minimization technique of Fletcher-Powell is used, making use of a transformation of optimization parameters to satisfy the mild constraints of stability. This method is considered to be more efficient on an overall basis than the existing 1, design technique of Maria and Fahmy. Nor does it rely on Deczky's theorem to ensure a stable filter which may sometimes lead to unstable solutions in the two-dimensional case. An example is provided illustrating the method.

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Comment on computer-aided design of stable recursive digital filters from magnitude specifications

✍ P. Karivaratha Rajan; Harnatha Reddy; M. N. S. Swamy 📂 Article 📅 1980 🏛 John Wiley and Sons 🌐 English ⚖ 74 KB

In a recent paper' Prasad and Reddy suggest a method of designing two-dimensional recursive digital filters making use of a method proposed by them for the generation of strictly Hurwitz polynomials.2 A major requirement in any approximation method using optimization procedures is that the search fo