不同测量对头相关传输函数的听觉影响

头相关传输函数(HRTF)是虚拟听觉重放的核心·目前,HRTF的实验室测量缺乏统一的规范。本文研究了不同测量对HRTF的听觉影响。首先提出了扩散场均衡的预处理方法,并对来自5个不同数据库的KEMAR假人的HRTF数据进行了扩散场均衡;然后,采用谱差异评估了不同数据库HRTF测量的频谱差异;最后,采用HRTF合成的虚拟声信号开展了一系列的主观听音实验,包括定位实验和区分实验·结果表明,扩散场均衡是一种有效的HRTF预处理方法,可以减小不同测量对HRTF频谱的影响;不同测量基本上不影响HRTF在12 kHz以下的定位效果,但对音色的影响较大,从而导致听觉上的可区分. 

Influence of different measuring procedures of head-related transfer functions on auditory perception

Head-related transfer functions(HRTFs) are the core of virtual auditory display. However, a standard procedure in HRTF measurements hasn't been established. This work investigates the influence of different measuring procedures of HRTF on auditory perception. Firstly, the diffusion-field equalization was proposed as a pre-processing method, and applied to HRTFs of a single dummy head KEMAR from five different databases. Then, the spectral deviations among the HRTFs were calculated. Finally, a series of subjective listening experiments(including localization and discrimination experiments) were conducted.Resultsindicate the diffusion-field equalization is an effective preprocessing method which can reduce the influence of difference measuring procedures on HRTF's magnitude spectra;moreover, the different measuring procedures of HRTFs have little influence on localization below 12 kHz but obvious influence on timbre, which may lead to audible discrimination.