考虑电感特性的扬声器线性参数辨识

Loudspeaker linear parameters identification considering electrical inductance

当扬声器单元在其有效频率范围内所体现出的电感特性不可忽略时,采用纯电阻模型进行线性参数辨识得到的直流电阻辨识结果会与测量值产生较大偏差。根据对单元电感特性的讨论,建立了考虑等效电感的离散时间系统模型,推导了基于IIR自适应滤波器实现对直流电阻和等效电感辨识的迭代公式,并通过实验给出了与采用纯电阻模型进行参数辨识的结果对比,结果对比表明考虑电感的模型可以更为有效和稳定地实现对扬声器单元直流电阻的实时辨识。

The identified DC resistance results under pure resistance model may lead to significant biases when the tested units embody non-ignorable electrical inductance at midrange and high frequency part.With brief discussion of such effect,we derive the difference equation of the electrical part considering electrical inductance and further derive the iterative formula for the electrical part linear parameters identification based on adaptive IIR filter.The following experiment shows the DC resistance identification results under model considering electrical inductance are much more effective and stabilized than that under the pure resistance model.