Resolving Grouped Nonlinearities in Wave Digital Filters using Iterative Techniques

Michael Jørgen Olsen; Kurt James Werner; Julius O. Smith
DAFx-2016 - Brno
In this paper, iterative zero-finding techniques are proposed to resolve groups of nonlinearities occurring in Wave Digital Filters. Two variants of Newton’s method are proposed and their suitability towards solving the grouped nonlinearities is analyzed. The feasibility of the approach with implications for WDFs containing multiple nonlinearities is demonstrated via case studies investigating the mathematical properties and numerical performance of reference circuits containing diodes and transistors; asymmetric and symmetric diode clippers and a common emitter amplifier.