IIR Filter Design by Transformation
The first techniques for discrete-time filter design we shall study involve transformation of the designs for continuous-time filters. The classical filter approximations are of particular interest because they are equally applicable, in most cases, to continuous- or discrete-time design and because they are so widely known and satisfy various optimality criteria. Of necessity, discrete-time filters derived by transformation from continuous-time designs are IIR filters because the number of finite poles must equal or exceed the number of finite zeros in the continuous-time case in order to prevent infinite gain at infinite frequency.
KeywordsCutoff Frequency Lowpass Filter Filter Design Magnitude Response Spectral Transformation
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