Using the bilinear transform to derive digital low-pass filters from their analog prototypes introduces severe warping of the response once the cutoff frequency approaches the Nyquist limit. We show how to design pre- warped first and second order low-pass prototypes that, after application of the bilinear transform, provide a better match with the magnitude response of the analog original than applying the bilinear transform directly. Result plots are given and compared for different cutoff frequencies and Q factors.
Author:
Massberg, Michael
Affiliation:
Brainworx Music & Media GmbH, Leichlingen, Germany
AES Convention:
131 (October 2011)
Paper Number:
8551
Publication Date:
October 19, 2011
Subject:
Audio Processing
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