Poletti M A, Fazi F M
Callaghan Innovation, P.O. Box 31-310, Lower Hutt, New Zealand.
Institute of Sound and Vibration Research, University of Southampton, SO17 1BJ, United Kingdom.
J Acoust Soc Am. 2015 Feb;137(2):598-605. doi: 10.1121/1.4906582.
An application of current interest in sound reproduction systems is the creation of multizone sound fields which produce multiple independent sound fields for multiple listeners. The challenge in producing such sound fields is the avoidance of interference between sound zones, which is dependent on the geometry of the zone and the direction of arrival of the desired sound fields. This paper provides a theoretical basis for the generation of two zones based on the creation of sound fields with nulls and the positioning of those nulls at arbitrary positions. The nulls are created by suppressing low-order mode terms in the sound field expansion. Simulations are presented for the two-dimensional case which shows that suppression of interference is possible across a broad frequency audio range.
当前在声音再现系统中受到关注的一个应用是创建多区域声场，该声场为多个听众产生多个独立的声场。产生这种声场的挑战在于避免声区之间的干扰，这取决于声区的几何形状和所需声场的到达方向。本文基于创建具有零值的声场并将这些零值定位在任意位置，为生成两个区域提供了理论基础。通过抑制声场展开中的低阶模式项来创建零值。给出了二维情况的模拟，结果表明在很宽的音频频率范围内抑制干扰是可能的。
