波场合成中声像感知距离重建

Synthesis of perceived distance based on wave field synthesis

声像距离是声像位置的重要信息,为了完整地描述重建声场中感知声像位置,需在虚拟声场中重建出声像距离。本文基于人耳对距离的感知机理,将镜像法引入波场合成技术中,通过模拟反射声来控制感知声像距离。基于"比较判断律"的主观测听实验表明:通过模拟房间反射声受试者更明显地感受到声像距离的变化,并且变化规律与人耳对距离的感知机理相符合。因此在基于波场合成的声重放系统中,通过模拟反射声和有效地控制反射声能量可以准确地重建出声像距离。

Source distance plays an important role in the realistic acoustic environment, so the synthesis of perceived distance is of great significance for sound field reproduction. From listener＇s perspective, reverberation can improve per- ceived distance, especially the early reverberation. Based on the mechanism of human perception and Huygens principle, the image method formulation has been introduced into the Helmholtz integral equation to synthesize reverberant sound field. The proposed method can provide realistic changes in direct-to-reverberant energy ratio and sound intensity while the distance between the listener and source changes. Subjective listening test has proved that the proposed method can provide more authentic distance perception in the reproduced sound field.