耳机到耳道传输函数最小相位近似的分析与验证

Analysis and Evaluation of Minimum-Phase Approximation of Headphone-to-Ear Canal Transfer Function

为了简化虚拟听觉重放中耳机均衡的信号处理，对耳机到耳道传输函数（HpTF）的最小相位近似特性进行了分析和验证．首先，采用封闭耳道法对20名受试者、3款耳机的HpTF进行了重复测量；然后，采用相关性分析和心理声学实验分别从物理和听觉的角度研究了HpTF最小相位近似的合理性．分析结果表明，在0～12 kHz 的频率范围，测量HpTF和最小相位近似HpTF的平均相关系数达0．95，因此从物理上可以认为HpTF的最小相位近似是合理的．心理声学实验结果进一步表明，在0～12 kHz的频段中，HpTF的最小相位近似不会引起可感知的听觉变化．

In order to simplify the headphone equalization processing in headphone-presented virtual auditory re-plays,the minimum-phase approximation of headphone-to-ear canal transfer functions （HpTFs）was analyzed and evaluated.In the investigation,first,HpTFs for 20 human subjects and three types of headphones were repeatedly measured by using the blocked ear canal technique.Then,the reasonability of the minimum-phase approximation of HpTFs was discussed through correlation analysis and psychoacoustic experiment.Analytical results indicate that the mean correlation coefficient between the measured and the minimum-phase-approximated HpTFs is 0.95 in the frequency range from 0 to 12 kHz,which validates the reasonability of the minimum-phase approximation of HpTFs. Moreover,the results of psychoacoustic experiment further demonstrate that there is no audible difference between the measured and the minimum-phase-approximated HpTFs at the frequency below 12 kHz.