Thesis

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Block-oriented modeling of nonlinearities in electro-acoustical transducers

Authors Glattfelder, K.
Year 2020
Thesis Type Audio Engineering project
Topic Audio Signal Processing
Keywords audio recording and reproduction, signal processing
Abstract Electro-acoustical transducers, or simply speakers and microphones, are essentially omnipresent throughout everybody's life. The properties and behaviors of these transducers can be analyzed and identified to create models which are used to further refine the quality of the sound or to digitally simulate the identified speaker (e.g. the cabinet of a guitar amplifier with its distinctive sound). One particular aspect of the transducer is its nonlinear behavior, that tends to be especially prominent when operating the speaker at high sound pressure levels (high displacement of the membrane). This “distortion” diminishes the sound quality and can create additional harmonic components that were not originally part of the signal. Although the total amount of the harmonic distortion can be quantified, it is not possible to further characterize the distortion with the conventional identification processes since they only capture the linear behavior. The goal of the current study is creating a python script for block-oriented modeling of nonlinearities in electro-acoustical transducers with Wiener or Hammerstein systems.
Supervisors Höldrich, R.