Sensitivity of human subjects to head-related transfer-function phase spectra
Sensitivity of human subjects to head-related transfer-function phase spectra
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DOI：
10.1121/1.426898
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发表时间：
1999-05-01
影响因子：
2.4
通讯作者：
Colburn, HS
中科院分区：
文献类型：
--
作者：
Kulkarni, A;Isabelle, SK;Colburn, HS
采用改进的相位谱模型，包括最小相位加延迟、线性相位和反向相位加延迟函数，对消声空间中人体头部相关传递函数（HRTF）进行建模。整体（宽带）耳间时间延迟（ITD）的建模HRTF一致的经验HRTF通过设置位置相关的，频率无关的延迟滞后耳的HRTF。最小相位加延迟重建的信号分析表明，模型HRTF偏离经验HRTF测量最大的对侧方位角和低海拔。受试者评估的感知效度模型HRTF在四个间隔，两个选择，被迫选择歧视的范式。结果表明，单耳辨别性能的科目是在所有三种类型的HRTF模型的机会。双耳的歧视性能是在机会的线性相位HRTF，以上的机会为最小相位加延迟HRTF的一些位置，并以上的机会为所有测试位置的反相加延迟HRTF。低频定时信息的分析表明，所有这些结果是一致的有效利用耳间的雾凇差异的低频成分的刺激波形。它的结论是，听众是不敏感的HRTF相位谱，只要整体ITD的低频分量不提供一个可靠的线索。特别地，只要低频ITD是适当的，HRTF相位谱的最小相位加延迟近似是足够的近似。这些结果和结论都局限于消声的情况下，当HRTF对应于短暂的脉冲响应限于几毫秒。(C)1999年美国声学学会。[S0001-4966（99）04505-1]。
Head-related transfer functions (HRTFs) for human subjects in anechoic space were modeled with modified phase spectra, including minimum-phase-plus-delay, linear-phase, and reversed-phase-plus-delay functions. The overall (wide-band) interaural time delay (ITD) for the modeled HRTFs was made consistent with that of the empirical HRTFs by setting the position-dependent, frequency-independent delay in the HRTF for the lagging ear. Signal analysis of the minimum-phase-plus-delay reconstructions indicated that model HRTFs deviate from empirical HRTF measurements maximally for contralateral azimuths and low elevations. Subjects assessed the perceptual validity of the model HRTFs in a four-interval, two-alternative, forced-choice discrimination paradigm. Results indicate that monaural discrimination performance of subjects was at chance for all three types of HRTF models. Binaural discrimination performance was at chance for the linear-phase HRTFs, was above chance for some locations for the minimum-phase-plus-delay HRTFs, and was above chance for all tested locations for the reversed-phase-plus-delay HRTFs. An analysis of low frequency timing information showed that all of these results are consistent with efficient use of interaural rime differences in the low-frequency components of the stimulus waveforms. It is concluded that listeners are insensitive to HRTF phase spectra as long as the overall ITD of the low-frequency components does not provide a reliable cue. In particular, the minimum-phase-plus-delay approximation to the HRTF phase spectrum is an adequate approximation as long as the low-frequency ITD is appropriate. These results and conclusions are all limited to the anechoic case when the HRTFs correspond to brief impulse responses limited to a few milliseconds. (C) 1999 Acoustical Society of America. [S0001-4966(99)04505-1].