Modification of second-order nonlinear IIR filter for compensating linear and nonlinear distortions of electrodynamic loudspeaker
Modification of second-order nonlinear IIR filter for compensating linear and nonlinear distortions of electrodynamic loudspeaker
复制标题
用于补偿电动扬声器线性和非线性失真的二阶非线性 IIR 滤波器的改进
DOI：
10.23919/eusipco.2017.8081698
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
Y. Kajikawa
中科院分区：
文献类型：
--
作者：
Kenta Iwai;Y. Kajikawa
在本文中，我们提出了一种改进的二阶非线性IIR滤波器，用于补偿电动扬声器的线性和非线性失真。非线性IIR滤波器是非线性补偿器，并且基于电动扬声器的物理非线性模型。然而，当扬声器在振动膜的位移变大的最低谐振频率处具有大锐度时，难以补偿非线性失真。虽然有必要补偿扬声器的锐度，但非线性IIR滤波器不能补偿锐度，因为它不具有线性滤波特性。本文提出了一种改进的二阶非线性IIR滤波器，该滤波器不仅可以补偿非线性失真，还可以利用扬声器的线性特性来补偿锐度，以达到所需的锐度。实验结果表明，该滤波器可以更有效地补偿线性和非线性失真比传统的滤波器。
In this paper, we propose a modified 2nd-order nonlinear IIR filter for compensation of both linear and nonlinear distortions of electrodynamic loudspeakers. A nonlinear IIR filter is a nonlinear compensator and is based on a physical nonlinear model of electrodynamic loudspeakers. However, it is difficult to compensate nonlinear distortions when a loudspeaker has large sharpness at the lowest resonance frequency, at which the displacement of the diaphragm becomes large. Although it is necessary to compensate the sharpness of the loudspeaker, the nonlinear IIR filter cannot compensate the sharpness because it does not have a linear filtering feature. In this paper, we propose a modified 2nd-order nonlinear IIR filter that can compensate not only the nonlinear distortions but also the sharpness by employing the linear characteristics of the loudspeaker with the desired sharpness. Experimental results show that the proposed filter can compensate the linear and nonlinear distortions more effectively than a conventional filter.