Black-Box Modelling of Nonlinear Audio Circuits

Loading...
Thumbnail Image
Journal Title
Journal ISSN
Volume Title
Sähkötekniikan korkeakoulu | Master's thesis
Date
2018-03-19
Department
Major/Subject
Acoustics and Audio Technology
Mcode
ELEC3030
Degree programme
CCIS - Master’s Programme in Computer, Communication and Information Sciences (TS2013)
Language
en
Pages
6 + 43
Series
Abstract
This Thesis details various black-box modelling techniques for nonlinear audio circuits. The aim of this work was to compare the different approaches and determine the current most accurate model. The models analysed were: Chebyshev polynomials, Hammerstein, polynomials of best fit and a parametric model. These implementations were compared based on their spectral accuracy and time-domain accuracy. From the analysis of these models, a new method is proposed. This proposed model restructures the determined most accurate black-box model by placing a nonlinearity between a high-pass and a low-pass filter. The filters emulate the linear response of the nonlinear circuit. These filters also have a reduced filter order in comparison to the linear response. The proposed method results in a model that performs close to the current best but does result in a massive reduction in computational time, up to 95% less time required and 99% fewer operations.
Description
Supervisor
Välimäki, Vesa
Thesis advisor
Esqueda, Fabián
Keywords
acoustic signal processing, nonlinear circuits, filters, nonlinear distortion
Other note
Citation