Design of Stable Circularly Symmetric Two-Dimensional GIC Digital Filters Using PLSI Polynomials. (12th July 2007)

• Record Type: Journal Article
• Authors: Gnanamuthu Gnanamuthu, Ezra Morris Abraham Ezra Morris Abraham; Eswaran Eswaran, C. C.; Ramar Ramar, K. K.
• Other Names: Merched Merched Ricardo Ricardo Academic Editor.
• Is Part Of: EURASIP journal on advances in signal processing. Volume 2007(2007)
• Publication Date: 2007-07-12
• Subjects: Signal processing -- Periodicals; Traitement du signal; Signal processing; Periodicals; 621.3822
• DOI: 10.1155/2007/72783
• Languages: English
• ISSNs: 1687-6172

Abstract

Abstract : A method for designing stable circularly symmetric two-dimensional digital filters is presented. Two-dimensional discrete transfer functions of the rotated filters are obtained from stable one-dimensional analog-filter transfer functions by performing rotation and then applying the double bilinear transformation. The resulting filters which may be unstable due to the presence of nonessential singularities of the second kind are stabilized by using planar least-square inverse polynomials. The stabilized rotated filters are then realized by using the concept of generalized immittance converter. The proposed method is simple and straight forward and it yields stable digital filter structures possessing many salient features such as low noise, low sensitivity, regularity, and modularity which are attractive for VLSI implementation.