南京大学学报（自然科学版）2016，Vol.52Issue(2)：382-389,8.DOI:10.13232/j.cnki.jnju.2016.02.020
散射条件下小尺度扬声器阵列声聚焦算法鲁棒性研究
Investigation on the robustness of acoustic focusing algorithm using small-scale loudspeaker array under scattering condition
摘要
Abstract
With the rapid development of portable communication devices,acoustic focusing characteristics of audio system have attracted increasingly more attention.The sound field reproduction system on portable communication devices can only be realized using small-scale loudspeaker array due to the limited size of such devices.Acoustic Contrast Control(ACC)algorithm can focus the sound energy in the bright zone by maximizing the ratio of the mean sound energy in the bright zone to that in the dark zone,which makes it a competitive method to realize sound focusing control using a small number of loudspeakers.The robustness of the acoustic focusing algorithm has attracted many researchers ’ attention.Most of them concentrate on the influence of the imperfection of the loudspeakers and the variation of the acoustic transfer function.Considering that the scattering of the user is inevitable in a practical acoustic focusing system,it is meaningful to investigate the robustness to head scattering.In this paper,a 5-channel linear loudspeaker array model was established and the robust Acoustic Contrast Control algorithm was employed to concentrate the sound energy around listeners in the bright zone in the endfire direction of the linear loudspeaker array.The optimization was conducted in frequency domain and a time domain FIR filter was designed to realize the wide-band optimal control.Simulations and experiments using single-frequency signal and wide-band white noise signal respectively were carried out to realize this 5-channel linear loudspeaker array acoustic focusing audio system.The analysis throughout this paper concentrates on the head scattering effect on the array performance.Both one-head and two-head scattering models were utilized.The experimental system was constructed based on a dummy head and a rigid sphere and the directivity of the 5-channel linear loudspeaker array was measured to verify the robustness of the sound focusing algorithm when there were listeners around the array.关键词
扬声器阵列/声聚焦/鲁棒性/头散射Key words
loudspeaker array/acoustic focusing/robustness/head scattering分类
信息技术与安全科学引用本文复制引用
涂臻,卢晶..散射条件下小尺度扬声器阵列声聚焦算法鲁棒性研究[J].南京大学学报（自然科学版）,2016,52(2):382-389,8.基金项目
国家自然科学基金(11374156,11204130) （11374156,11204130）
