Individual differences in external-ear transfer functions reduced by scaling in frequency
Individual differences in external-ear transfer functions reduced by scaling in frequency
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DOI：
10.1121/1.427176
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发表时间：
1999-09-01
影响因子：
2.4
通讯作者：
Middlebrooks, JC
中科院分区：
文献类型：
--
作者：
Middlebrooks, JC
本研究考察了从自由持有到人耳道的传递函数的主体间差异，这些传递函数通常被称为头部相关传递函数。这种传递函数的方向分量在这里被称为方向传递函数（dtf）。45个被试的dtf在频谱特征（如峰和凹痕）的频率上有系统的变化。在整个坐标球范围内，声源方向的dtf的主体间光谱差异在3.7 ~ 12.9 kHz之间进行了量化。对于每一对被试，一个最优的频率尺度因子会对齐被试之间的频谱特征，从而最小化被试之间的频谱差异。dtf的频率缩放使所有受试者对的频谱差异中位数减少了15.5%，9.5%的受试者对的频谱差异减少了一半以上。最优量表因子的中位数为1.061，最大值为1.38。任何一对受试者之间的最佳比例因子与受试者最大耳间延迟、外耳大小和头部宽度的比例高度相关。(C) 1999美国声学学会。[S00013966(99) 01409 - 5]。
This study examined inter-subject differences in the transfer functions from the free held to the human ear canal, which are commonly know as head-related transfer functions. The directional components of such transfer functions are referred here to as directional transfer functions (DTFs). The DTFs of 45 subjects varied systematically among subjects in regard to the frequencies of spectral features such as peaks and notches. Inter-subject spectral differences in DTFs were quantified between 3.7 and 12.9 kHz for sound-source directions throughout the coordinate sphere. For each pair of subjects, an optimal frequency scale factor aligned spectral features between subjects and, thus, minimized inter-subject spectral differences. Frequency scaling of DTFs reduced spectral differences by a median value of 15.5% across all pairs of subjects and by more than half in 9.5% of subject pairs. Optimal scale factors showed a median value of 1.061 and a maximum of 1.38. The optimal scale factor between any pair of subjects correlated highly with the ratios of subjects' maximum interaural delays, sizes of their external ears, and widths of their heads. (C) 1999 Acoustical Society of America. [S00013966(99)01409-5].