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Algorithm Transforms Filter Coefficients - 01/21/99 EDN-Design Ideas: To
synsize infinite-impulse-response (IIR)-filter functions, expressed as H(z), you
commonly use analog prototype-filter functions, expressed as H(s), using
bilinear-z transform. This operation entails some algebraic complexity in
calculating filter coefficients. The simple algorithm shown here transforms
prototype-filter coefficients (W0, W1, W2)to IIR digital-filter coefficients (U0,
U1, U2). These coefficients transform from s (analog)domain to z (digital)domain.....(design
idea added 11/05) |