Identification and elimination of second-order nonlinear distortion of loudspeaker systems using digital Volterra filter

Modeling loudspeaker system with the Volterra series expansion is essential to eliminate the nonlinear distortion. We have proposed a method measuring the Volterra kernel of loudspeaker systems by multi sinusoidal waves. This method, however, has problems not to consider the phase property of the nonlinear element and the third-order distortion. Therefore, we propose a novel method measuring the second-order Volterra kernel by multi sinusoidal waves. In this method, the phase property of the nonlinear element and the third-order distortion are considered. Moreover, we eliminate the nonlinear distortion of loudspeaker systems with the Volterra kernel measured by the proposed method and demonstrate the effectiveness through the results.