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I n general, digital filtering embodies a wide range of signal processing and sianalyzing applications but t h i s paper is concerned with the more conventional f i l t e r i n g requirements of frequency selection and rejection. Some of the principles involved in digital filtering are discussed from an intuitive point of view rather than in terms of the wellestablished mathemtical treatments.1,293The form of a general second order filter eection i s established using this intuitive approach and the extension t o higher order filters i s discussed.