Abstract
It is known that the transfer function of the desired digital IIR filter can beobtained from the analog lowpass filter by use of the digitizing procedures. Many useful design formulas for continuous-time filters relate to lowpass filters. The other types offilters, like highpass, bandpass and bandstop are obtained by frequency transformation. In general, analog or digital frequency transformations can be used, however available digital signal processing books give the practical design formulas for analog frequency transformation only. This paper proposes new procedures that applies digital frequency transformations.
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