扬声器阵列声场控制方法  

Speaker Array Sound Field Control Method Based on Quadratic Residue Sequence Combinations

作　　者：马登永[1] 柴国强[1] 周建明[1] 杨军[2] 

机构地区：[1]苏州上声电子有限公司,江苏苏州215133 [2]中国科学院声学研究所,北京100190

出　　处：《电声技术》2014年第12期23-30,34,共9页Audio Engineering

摘　　要：在大型厅堂、体育场馆、露天广场、火车站和飞机场等场所,多扬声器单元组阵时存在较为严重的声波干涉,造成重放声场中存在较多的峰谷点。为了改善阵列辐射声场的均匀化程度,传统的基于二次剩余序列相位延迟控制方法,仅依赖单个有限长度的二次剩余序列来设计相位延迟矢量,对声场均匀程度的改善能力有限。提出了基于二次剩余序列组合特性的扬声器阵列声场控制方法,通过扩大二次剩余序列的范围,利用多组不同二次剩余子序列的组合特性,设计了更为优化的阵列相位延迟控制矢量,从而提高了阵列辐射声场的均匀化程度,并且该方法物理实现简单,适合于阵列扩声系统在宽频带、大空间范围内的应用。In some audio - visual place of large space such as a large hall, a stadium, an open - air square, a railway sta- tion and an airport, due to severe interference effect, the conventional sound reproducing system based on separately ar- ranged multiple speakers will cause that many peak - valley points arise spatially in the superposed sound field. To improve the uniformity degree of the sound field distribution of the array, the conventional methods for controlling phase delay based on a quadratic residue sequence, the phase delay vector is designed only relying on single quadratic residue sequence with finite length, thus, these methods may have a limited ability to improve uniformity of sound field. In this paper, a speaker ar- ray sound field control method based on quadratic residue sequence combinations is presented. By expanding the range of quadratic residue sequences, an optimal phase delay control vector is designed by means of combination characteristics of multiunit different quadratic residue subsequences, and array phase control is performed using such optimal phase delay vec- tor to improve the uniformity of array sound field. Additionally, the method is simple in physical implementation, and thus sound reinforcement system is applicable within the range of wideband and large space.

关 键 词：扬声器阵列 二次剩余序列 相位延迟 

分 类 号：TN643[电子电信—电路与系统]