Digital compensation of nonlinear distortion in loudspeakers


Vries, Ruurd de 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 (pp. pp. 165-168).

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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
Electrical Engineering, Mathematics and Computer Science (EEMCS)
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