The modeling of a weakly nonlinear system having an asymmetric saturating nonlinearity is considered, and a computationally efficient model is proposed. The nonlinear model is the cascade of linear filters and memoryless nonlinearities, an LNLNL system. The two nonlinearities are upward and downward saturators, limiting, respectively, the amplitude of their input for either positive or negative excursions. In this way, distortion noted in each half an input sinusoid can be separately controlled. This simple model is applied toy simulating the signal chain of the Echoplex EP-4 tape delay, where informal listening tests showed excellent agreement between recorded and simulated program material.

Authors: Lee, Keun Sup; Abel, Jonathan S.
Affiliations: DTS, Inc., Los Gatos, CA, USA; Stanford University, Stanford, CA, USA(See document for exact affiliation information.)
AES Convention: 133 (October 2012) Paper Number: 8697
Publication Date: October 25, 2012
Subject: Audio Effects and Physical Modeling

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