| 刘力,蔡野锋,吴鸣,杨军.基于最小二乘法的均匀扩声技术研究[J].,2015,34(1):7-16 |
| 基于最小二乘法的均匀扩声技术研究 |
| An investigation of uniform sound reinforcement technology based on least squares method |
| 投稿时间：2014-01-23 修订日期：2014-12-27 |
| 中文摘要: |
| 针对目前室外及超大型室内空间的扩声应用中声场分布不均匀的问题，本文提出了一种基于最小二乘法声场重建方法的扩声技术。该技术通过对目标声场的逼近来计算线性扬声器阵列各通道的输入参数，实现扩声区域内声压级的均匀分布，同时约束非扩声区域的声能量以获得较好指向性。本文通过仿真研究算法各参数的改变对控制结果的影响，探讨不同扩声区域和目标所对应参数的选取方法。仿真和实验比较了该算法以及未经控制的声场、相移法波束控制的效果，证明该方法可以获得更好的声场均匀度。 |
| 英文摘要: |
| The problem to achieve uniform sound pressure level (SPL) over audience area in both outdoor and indoor sound reinforcement applications is investigated in this paper. A novel design strategy based on the least squares method is proposed. The flat distribution of the SPL can be achieved while the input signals of loudspeaker array are adjusted by approximation of the desired response on the audience area. At the same time, the target level on the other positions is kept as low as possible for better directivity control. The impact on the SPL distribution arisen from different parameter settings of this method is evaluated by simulations, and the selection procedure of these parameters is also discussed. A comparison among the effects of the proposed method, phase-shift method as well as the uncontrolled sound field was conducted in real applications. Both simulation and experimental results demonstrate the effectiveness of the new design. |
| DOI：10.11684/j.issn.1000-310X.2015.01.002 |
| 中文关键词: 最小二乘法，均匀扩声，扬声器阵列 |
| 英文关键词: Least squares, Uniform sound reinforcement, Loudspeaker array |
| 基金项目:国家自然科学基金 |
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