Badajoz Javier, Chang Ji-Ho, Agerkvist Finn T
Acoustic Technology, Department of Electrical Engineering, Technical University of Denmark, Building 352, DK-2800 Kongens Lyngby, Denmark.
Samsung Electronics, Samsung-ro 129, Yeongtong-gu, Suwon, Gyeonggi-do, 443-742, Republic of Korea.
J Acoust Soc Am. 2015 Oct;138(4):2387-98. doi: 10.1121/1.4930952.
In anechoic conditions, the Interaural Level Difference (ILD) is the most significant auditory cue to judge the distance to a sound source located within 1 m of the listener's head. This is due to the unique characteristics of a point source in its near field, which result in exceptionally high, distance dependent ILDs. When reproducing the sound field of sources located near the head with line or circular arrays of loudspeakers, the reproduced ILDs are generally lower than expected, due to physical limitations. This study presents an approach that combines a sound field reproduction method, known as Pressure Matching (PM), and a binaural control technique. While PM aims at reproducing the incident sound field, the objective of the binaural control technique is to ensure a correct reproduction of interaural differences. The combination of these two approaches gives rise to the following features: (i) an accurate reproduction of ILDs is achieved at the head positions considered by the method, (ii) the ILD variations in the vicinity of those positions are smoothed, thus lowering the ILD error, and (iii) the true wavefront is preserved. Given the properties of the presented method, intended distance and directional perception is expected.
在无回声条件下，双耳声级差（ILD）是判断位于听者头部1米范围内声源距离的最重要听觉线索。这是由于点声源在其近场的独特特性，导致产生与距离高度相关的异常高的双耳声级差。当用线性或圆形扬声器阵列再现头部附近声源的声场时，由于物理限制，再现的双耳声级差通常低于预期。本研究提出了一种将称为压力匹配（PM）的声场再现方法与双耳控制技术相结合的方法。虽然压力匹配旨在再现入射声场，但双耳控制技术的目标是确保双耳差异的正确再现。这两种方法的结合产生了以下特点：（i）在该方法考虑的头部位置实现了双耳声级差的精确再现；（ii）这些位置附近的双耳声级差变化得到平滑处理，从而降低了双耳声级差误差；（iii）保留了真实的波前。鉴于所提出方法的特性，预期能够实现预期的距离和方向感知。
