State-Space Modeling and Identification of Loudspeaker with Nonlinear Distortion

Pascal Brunet and Bahram Shafai


nonlinear systems, loudspeaker, modeling


This paper considers modeling and identification of nonlinear systems pertinent to loudspeaker with nonlinear distortion effect. Generally speaking when small loudspeakers are driven at high playback levels the nonlinear characteristics of these speakers become a major source of sound degradations. Consequently it is essential to find a good model that matches to the loudspeaker response. This becomes particularly important for the purpose of improving sound quality of mobile phones. This paper analyzes the loudspeaker operation and provides nonlinear modeling techniques that can reliably be used for its identification process. Frequency domain and state-space modeling are considered and emphasis is given towards polynomial nonlinear state-space models.

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