Katz Brian F G, Noisternig Markus
Audio Acoustique, LIMSI-CNRS, Université Paris-Sud, 91403 Orsay, France.
UMR STMS IRCAM-CNRS-UPMC, 1 place Igor-Stravinsky, 75004 Paris, France.
J Acoust Soc Am. 2014 Jun;135(6):3530-40. doi: 10.1121/1.4875714.
The Interaural Time Delay (ITD) is an important binaural cue for sound source localization. Calculations of ITD values are obtained either from measured time domain Head-Related Impulse Responses (HRIRs) or from their frequency transform Head-Related Transfer Functions (HRTFs). Numerous methods exist in current literature, based on a variety of definitions and assumptions of the nature of the ITD as an acoustic cue. This work presents a thorough comparative study of the degree of variability between some of the most common methods for calculating the ITD from measured data. Thirty-two different calculations or variations are compared for positions on the horizontal plane for the HRTF measured on both a KEMAR mannequin and a rigid sphere. Specifically, the spatial variations of the methods are investigated. Included is a discussion of the primary potential causes of these differences, such as the existence of multiple peaks in the HRIR of the contra-lateral ear for azimuths near the inter-aural axis due to multipath propagation and head/pinnae shadowing.
双耳时间延迟（ITD）是声源定位的重要双耳线索。ITD值的计算可从测量的时域头部相关脉冲响应（HRIR）或其频率变换头部相关传递函数（HRTF）中获得。基于对ITD作为声学线索性质的各种定义和假设，当前文献中存在许多方法。这项工作对从测量数据计算ITD的一些最常用方法之间的变异性程度进行了全面的比较研究。针对在KEMAR人体模型和刚性球体上测量的HRTF，比较了水平面上位置的32种不同计算或变体。具体而言，研究了这些方法的空间变化。其中包括对这些差异的主要潜在原因的讨论，例如由于多径传播和头部/耳廓遮蔽，在双耳轴附近方位角的对侧耳HRIR中存在多个峰值。
