The goals of this study were to measure sensitivity to the direct-to-reverberant energy ratio (D∕R) across a wide range of D∕R values and to gain insight into which cues are used in the discrimination process. The main finding is that changes in D∕R are discriminated primarily based on spectral cues. Temporal cues may be used but only when spectral cues are diminished or not available, while sensitivity to interaural cross-correlation is too low to be useful in any of the conditions tested. These findings are based on an acoustic analysis of these variables and the results of two psychophysical experiments. The first experiment employs wideband noise with two values for onset and offset times to determine the D∕R just-noticeable difference at −10, 0, 10, and 20 dB D∕R. This yielded substantially higher sensitivity to D∕R at 0 and 10 dB D∕R (2–3 dB) than has been reported previously, while sensitivity is much lower at −10 and 20 dB D∕R. The second experiment consists of three parts where specific cues to D∕R are reduced or removed, which enabled the specified rank ordering of the cues. The acoustic analysis and psychophysical experiments also provide an explanation for the “auditory horizon effect.”
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机译:这项研究的目的是在很大的D ∕ R值范围内测量对直接与混响能量之比(D ∕ R)的敏感性,并了解在鉴别过程中使用了哪些线索。主要发现是D ∕ R的变化主要是根据频谱线索来区分的。可以使用时间提示,但是仅当频谱提示减少或无法使用时,而对耳间互相关的灵敏度太低,无法在任何测试条件下使用。这些发现是基于对这些变量的声学分析以及两个心理物理实验的结果。第一个实验采用宽带噪声和两个起始值和偏移时间值来确定D ∕ R在-10、0、10和20 dB D ∕ R时的明显差异。与以前的报告相比,这在0和10 dB D ∕ R(2-3 dB)时对D ∕ R的灵敏度要高得多,而在-10和20 dB D ∕ R的灵敏度要低得多。第二个实验包括三个部分,其中减少或删除了D ∕ R的特定提示,从而可以对提示进行指定的排序。声学分析和心理物理实验也为“听觉水平效应”提供了解释。
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