基于正交基扩展法的多区声场重放技术研究

近年来,空间多区声场重放(spatial multizone soundfield reproduction)技术逐渐成为声学信号处理领域中的新热点,此技术旨在无须使用物理隔离或耳机的情况下为听众提供个性化的听音环境。本文基于正交基扩展法,模拟2-D多区声场重放系统,探究了该方法中参数设置与声场性能的关系。实验结果表明,在预重放声场为整个区域半径1 m,明暗区半径均为0.3 m,平面波数量为80的情况下,随着频率的增加,重放声场的声能对比度性能变差,亮区重放误差变小。增大亮区或其他区域加权参数,降低暗区加权参数,重放声场的声能对比度下降;增大暗区或其他区域加权参数,降低亮区加权参数,亮区重放误差增加。

Multizone soundfield reproduction based on orthogonal expansion

In recent years,spatial multi-zone soundfield reproduction has gradually become a new hotspot in the field of acoustic signal processing. This technology aims to provide a personalized listening environment for listeners without using physical isolations or headphones. This paper simulated a 2-D multizone soundfield based on orthogonal expansion,and explored the relationship between parameter settings and soundfield performance. The results showed that,when the whole desired reproduction region is in radius of 1 m,the radius of bright zone and quiet zone are both 0. 3 m,and the number of plane waves is 80,the acoustic brightness contrast became worse with the increasing of frequency,but the error in bright zone became smaller. As the bright zone weights or unattended zone weights increased and the quiet zone weights reduced,the acoustic brightness contrast became worse. The error in bright zone would increase with the increasing of quiet zone weights or unattended zone weights and reducing of bright zone weights.