A method for the design of discrete-time second-order shelf filters is developed which allows the response of an analog resonant shelf filter to be approximated in the digital domain. For filters whose features approach the Nyquist limit, the proposed method provides a closer approximation to the analog response than direct application of the bilinear transform. Three types of resonant shelf filter are discussed, and design examples are presented.

Authors: Abel, Jonathan S.; Berners, David P.
Affiliation: Universal Audio Inc., Santa Cruz, CA
AES Convention: 115 (October 2003) Paper Number: 5939
Publication Date: October 1, 2003
Subject: Signal Processing for Audio

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