The late reverberation characteristics of a sound field are often assumed to be perceptually isotropic, meaning that the decay of energy is perceived as equivalent in every direction. In this paper, we employ Ambisonics reproduction methods to reassess how a decaying sound field is analyzed and characterized and our capacity to hear directional characteristics within late reverberation. We propose the use of objective measures to assess the anisotropy characteristics of a decaying sound field. The energy-decay deviation is defined as the difference of the direction-dependent decay from the average decay. A perceptual study demonstrates a positive link between the range of these energy deviations and their audibility. These results suggest that accurate sound reproduction should account for directional properties throughout the decay.

中文翻译：

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定向后期混响的感知分析

声场的后期混响特性通常被认为是感知上各向同性的，这意味着能量衰减在每个方向上都被认为是等效的。在本文中，我们采用 Ambisonics 再现方法来重新评估衰减声场的分析和表征方式，以及我们在后期混响中听到方向特征的能力。我们建议使用客观措施来评估衰减声场的各向异性特征。能量衰减偏差定义为方向相关衰减与平均衰减的差。一项感知研究表明，这些能量偏差的范围与其可听度之间存在正相关关系。这些结果表明，准确的声音再现应该考虑整个衰减过程中的方向特性。