Simulating an Asymmetrically Saturated Nonlinearity Using an LNLNL Cascade

TitleSimulating an Asymmetrically Saturated Nonlinearity Using an LNLNL Cascade
Publication TypeConference Paper
Year of Publication2012
AuthorsLee, K. S., and J. S. Abel
Conference Name133rd Audio Engineering Society Convention
Date Published10/2012
Conference LocationSan Francisco, CA, USA
AbstractThe 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.
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