Publication IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer SciencesVol.E75-ANo.7pp.830-836 Publication Date: 1992/07/25 Online ISSN: DOI: Print ISSN: 0916-8508 Type of Manuscript: Special Section PAPER (Special Section on Multidimensional Signal Processing) Category: Design and Implementation of Multidimensional Digital Filters Keyword: circularly symmetric, constant group delay, McClellan transformation, separable denominator,
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Summary: We present a successful method for designing 2-D circularly symmetric R lowpass filters with constant group delay. The procedure is based on a transformation of a 1-D prototype R filter with constant group delay, whose magnitude response is the 2-D cross-sectional response. The 2-D filter transfer function has a separable denominator and a numerator which is obtained from the prototype numerator by means of a series of McClellan transformations whose free parameters can be optimized by successive procedure. The method is illustrated by an example.