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Higher Order stoz Mapping Functions for Digital Filters,Used
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Digital filters are frequently designed by taking an analog (continuoustime) filter and converting it into its digital (discretetime) equivalent. Linear, timeinvariant discretetime filters with fixed sampling rates are usually designed by conversions from the analog using bilinear transformation. This book deals with conversions from analog domain into digital domain by higher order stoz transformations. By using higher order rules, we obtain better accuracy in digitizing continuoustime filters. Unlike the bilinear transformation, the higher order rules do not have a stability region which cover the entire lefthalf of the splane. The sampling period used in the digitizing process has to be selected in such a way that all the poles of the continuoustime filter lie inside the stability region of the selected rule. Otherwise, the discretetime filter will be unstable. The startup error obtained due to the discontinuity in the input signal is also discussed.
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