Digital compensation of nonlinear distortion in loudspeakers


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Vries de, Ruurd and Berkhoff, Arthur P. and Slump, Cornelis H. and Herrmann, Otto E. (1993) Digital compensation of nonlinear distortion in loudspeakers. In: IEEE International Conference on Acoustics, Speech, and Signal Processing, ICASSP, 27-30 April 1993, Minneapolis, Minnesota, USA.

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Abstract:Loudspeakers produce nonlinear distortion. The authors present a method to compensate for this distortion in real time by nonlinear digital signal processing implemented on a digital signal processor (i.e., the TMS320C30 DSP). Based on the literature, an electrical equivalent circuit of an electrodynamic loudspeaker is developed, resulting in a linear lumped parameter model. The parameters in this model are matched with the measurements of a selected test loudspeaker. The linear model is extended to include nonlinear effects by developing the parameters as a function of the voice coil excursion of the loudspeaker in a Taylor series expansion. The resulting nonlinear system is described by a Volterra series. On the basis of this description, an inverse circuit is designed for the second-order nonlinear distortion. This circuit was implemented in real time on the DSP, using a high-level design and code generation system. Simulations and experiments are presented
Item Type:Conference or Workshop Item
Copyright:© 1993 IEEE
Faculty:
Electrical Engineering, Mathematics and Computer Science (EEMCS)
Research Group:
Link to this item:http://purl.utwente.nl/publications/16220
Official URL:http://dx.doi.org/10.1109/ICASSP.1993.319081
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Metis ID: 113105