扬声器低频非线性参数建模与仿真研究

Research of Modeling and Simulation of the Loudspeaker's Nonlinearities at Low Frequency

在小信号条件下对具有相同匝数的扬声器长、短音圈进行了仿真,重点讨论了扬声器电-力变换因数与音圈位移的非线性关系,发现在位移变化时,长线圈的电-力变换因数的变化率较小,但在小位移时短线圈能够提供较大的电-力变换因数;同时研究了音圈电感与频率、位移的联系,发现长音圈电感的变化率较小,随着频率升高因趋肤效应音圈的电感都逐渐下降。可见长音圈具有较高的保真性,而短线圈因有较高的电-力变换因数与电感,更适合于小位移的高频段。

A long voice coil and a short one of loudspeaker with same turns are simulated under the circumstance of small signal in this paper. The characters of the force factor with varied displacement are emphasized, and the changing ratio of the long voice＇s force factor is lower than that of the short one＇s, the influence of frequency and displacement to the inductance of voice coil are studied at the same time, the changing ratio of the long voice coil＇s inductance is smaller than that of the short one＇s while the inductance of the two decrease with increasing frequency. The long voice coil has better fidelity than the short one while the short one with greater force factor and inductance is more adaptive for the high frequency with small displacement.