Geometric construction relating analog and digital frequencies for digital filters derived with bilinear transformation
R. Radzyner · IEEE Transactions on Acoustics Speech and Signal Processing · 1978
A simple geometric construction is given which relates the analog and digital domain real frequencies, respectively, when the (all-pass) bilinear transformation is used to derive a digital filter from an analog prototype. The technique is useful for the visualization of the frequency compression that occurs with the bilinear transformation.