The minimum audible movement distance was estimated for approaching and receding sound images with a reduced fraction of high-frequency spectral components which reflects an age-related deterioration of auditory perception (presbycusis). Such a reduction can lead to a partial shutdown of the high-frequency binaural auditory mechanism and changes in distance estimation for sound sources positioned at egocentric distances up to 5 m, i.e. in case of making a contact (collision) decision. This study was carried out in free-field conditions using a sound source movement model. The movement was modelled by noise bursts with linearly changing amplitudes, which were emitted by two loudspeakers spaced 3 m apart. The minimum audible movement distance in estimating moving sound images with a reduced fraction of high-frequency signal components was found to be twice as low as for sound images without such a reduction. The data obtained indicate that, provided that the suprathreshold signal encoding mechanisms remain intact, high-frequency level lowering does not increase the minimum audible movement distance.

中文翻译：

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用于定位接近和后退宽带噪声的最小可听移动距离，具有减少的高频光谱成分典型的老式耳蜗

最小可听移动距离是针对接近和后退的声音图像估算的，其中高频频谱分量的比例减少，这反映了与年龄相关的听觉感知（老年性耳聋）的恶化。这种减少会导致高频双耳听觉机制的部分关闭以及位于以自我为中心的距离达 5 m 处的声源的距离估计的变化，即在做出接触（碰撞）决定的情况下。这项研究是在自由场条件下使用声源运动模型进行的。这种运动是通过振幅线性变化的噪声爆发来模拟的，这些噪声是由两个相距 3 m 的扬声器发出的。发现在估计具有减少的高频信号分量部分的运动声像时的最小可听移动距离是没有这种减少的声像的两倍。获得的数据表明，只要超阈值信号编码机制保持不变，高频电平降低不会增加最小可听移动距离。