Dynamic distortion measurement for linearization of loudspeaker systems

In this paper, we demonstrate the compensation effect of nonlinear distortion of loudspeaker systems using dynamic distortion measurement. The swept sinusoidal wave is usually used for the verification of the compensation effect of nonlinear distortion. However, the evaluation result is not always corresponding to actual drive status because the input signals to loudspeaker systems have wideband frequency components like music and voice. We therefore use dynamic distortion measurement with white noise which is a wideband signal. We design both a linearization system using Volterra filter and Mirror filter using the linear and the nonlinear parameters of a loudspeaker system estimated by Simulated Annealing(SA), and examine the effectiveness on compensating nonlinear distortions of the loudspeaker system. Experimental results show that the dynamic distortion measurement has effectivity.