基于入耳式耳机电阻抗特性的个性化均衡研究

Insert earphone impedance and its application to individualized equalization

入耳式耳机封闭耳道会大幅改变耳道辐射阻抗,使得耳道内声压产生畸变进而导致头中定位效应。该文首次通过建模分析耳机与外耳耦合时声负载的变化,建立起耳机电阻抗与个性化耳机-耳道传递函数的关系。根据耳机电阻抗设计个性化滤波器以消除传递函数中高Q值的共振峰,均衡耳道内声压畸变。主观实验结果表明,基于耳机电阻抗特性的个性化均衡对于消除头中定位效应有显著作用。

The ear canal radiation impedance changes drastically with earphone blocking the entrance,which causes unnatural resonances and eventually leads to in-head localization.The relationship between the earphone’s electric impedance and the earphone-to-ear-canal transfer function is first established based on the modeling of the acoustic load caused by the coupling with ear.Individualized equalization is designed according to earphone electric impedance to eliminate the high Q value resonance in the ear canal.The results obtained from subjective tests demonstrate that individual equalization based on the earphone’s electric impedance results in externalized sound images.