|本期目录/Table of Contents|

[1]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.[doi:10.13232/j.cnki.jnju.2016.02.020]
 Tu Zhen*,Lu Jing.Investigation on the robustness of acoustic focusing algorithm using small­scale loudspeaker array under scattering condition[J].Journal of Nanjing University(Natural Sciences),2016,52(2):382.[doi:10.13232/j.cnki.jnju.2016.02.020]
点击复制

散射条件下小尺度扬声器阵列声聚焦算法鲁棒性研究()
     

《南京大学学报(自然科学版)》[ISSN:0469-5097/CN:32-1169/N]

卷:
52
期数:
2016年第2期
页码:
382
栏目:
出版日期:
2016-04-01

文章信息/Info

Title:
Investigation on the robustness of acoustic focusing algorithm using small­scale loudspeaker array under scattering condition
作者:
涂 臻*卢 晶
近代声学教育部重点实验室,南京大学声学所,南京,210093
Author(s):
Tu Zhen*Lu Jing
Key Laboratory of Modern Acoustics,Institute of Acoustics,Nanjing University,Nanjing,210093,China
关键词:
扬声器阵列声聚焦鲁棒性头散射
Keywords:
loudspeaker arrayacoustic focusingrobustnesshead scattering
分类号:
TN912.33
DOI:
10.13232/j.cnki.jnju.2016.02.020
文献标志码:
A
摘要:
随着便携通讯设备的快速发展,其音频系统的声聚焦特性逐渐受到了广泛的关注.受到尺寸的限制,便携通讯设备上的声场回放只能采用小尺度扬声器阵列来实现.声对比度控制法通过最大化亮区与暗区的声能量比值将声能量集中在亮区,这种算法在小尺度扬声器阵列声聚焦的实现上有着较好的应用前景.建立了5通道线性扬声器阵列模型,采用鲁棒型声对比度控制法将声能量聚焦于阵列端射方向的亮区.考虑到使用者对阵列不可避免的散射作用,重点分析了听音者散射对阵列声聚焦性能的影响,散射分析建立在一个刚性球散射模型和双刚性球散射模型(亮区和暗区同时存在听音者)的基础上.进一步采用人工头和刚性球建立了实验系统,通过实验验证了算法对于一个听音者和两个听音者散射的鲁棒性.
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 small­scale 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 5­channel 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 wide­band optimal control.Simulations and experiments using single­frequency signal and wide­band white noise signal respectively were carried out to realize this 5­channel linear loudspeaker array acoustic focusing audio system.The analysis throughout this paper concentrates on the head scattering effect on the array performance.Both one­head and two­head scattering models were utilized.The experimental system was constructed based on a dummy head and a rigid sphere and the directivity of the 5­channel linear loudspeaker array was measured to verify the robustness of the sound focusing algorithm when there were listeners around the array.

参考文献/References:

[1] Choi J W,Kim Y H.Generation of an acoustically bright zone with an illuminated region using multiple sources.The Journal of the Acoustical Society of America,2002,111(4):1695-1700. [2] Coleman P,Jackson P J B,Olik M,et al.Acoustic contrast,planarity and robustness of sound zone methods using a circular loudspeaker array.The Journal of the Acoustical Society of America,2014,135(4):1929-1940. [3] Coleman P,Jackson P J B,Olik M,et al.Personal audio with a planar bright zone.The Journal of the Acoustical Society of America,2014,136(4):1725-1735. [4] Chang J H,Lee C H,Park J Y,et al.A realization of sound focused personal audio system using acoustic contrast control.The Journal of the Acoustical Society of America,2009,125(4):2091-2097. [5] Chang J H,Park J Y,Kim Y H.Scattering effect on the sound focused personal audio system.The Journal of the Acoustical Society of America,2009,125(5):3060-3066. [6] Shin M,Fazi F M,Casagrande Hirono F,et al.Control of a dual­layer loudspeaker array for the generation of private sound.In:The 41th International Congress on Noise Control Engineering.New York:INCE Press,2012,5911-5921. [7] Shin M,Fazi F M,Nelson P A,et al.Controlled interference from a dual layer loudspeaker.In:The 20th International Congress on Sound and Vibration.Bangkok Thailand:IIAV Press,2013,2090-2097. [8] Shin M,Fazi F M,Nelson P A,et al.Controlled sound field with a dual layer loudspeaker array.Journal of Sound and Vibration,2014,333(16):3794-3817. [9] Cai Y,Wu M,Yang J.Sound reproduction in personal audio systems using the least­squares approach with acoustic contrast control constraint.The Journal of the Acoustical Society of America,2014,135(2):734-741. [10] Cai Y,Wu M,Liu L,et al.Time­domain acoustic contrast control design with response differential constraint in personal audio systems.The Journal of the Acoustical Society of America,2014,135(6):EL252-EL257. [11] Cai Y,Liu L,Wu M,et al.Robust time­domain acoustic contrast control design under uncertainties in the frequency response of the loudspeakers.In:The 43rd International Congress on Noise Control Engineering.Melbourne Australia:INCE Press,2014,5775-5780. [12] Gálvez M F S,Elliott S J,Cheer J.A superdirective array of phase shift sources.The Journal of the Acoustical Society of America,2012,132(2):746-756. [13] Gálvez M F S,Elliott S J,Cheer J.The effect of reverberation on personal audio devices.The Journal of the Acoustical Society of America,2014,135(5):2654-2663. [14] Park J Y,Choi J W,Kim Y H.Acoustic contrast sensitivity to transfer function errors in the design of a personal audio system.The Journal of the Acoustical Society of America,2013,134(1):EL112-EL118. [15] Elliott S J,Cheer J,Choi J W,et al.Robustness and regularization of personal audio systems.IEEE Transactions on Audio,Speech,and Language Processing,2012,20(7):2123-2133. [16] Elliott S J,Cheer J,Murfet H,et al.Minimally radiating sources for personal audio.The Journal of the Acoustical Society of America,2010,128(4):1721-1728. [17] Chang J H,Jacobsen F.Experimental validation of sound field control with a circular double­layer array of loudspeakers.The Journal of the Acoustical Society of America,2013,133(4):2046-2054. [18] Masiero B,Qiu X.Two listeners crosstalk cancellation system modelled by four point sources and two rigid spheres.Acta Acustica united with Acustica,2009,95(2):379-385.

相似文献/References:

备注/Memo

备注/Memo:
基金项目:国家自然科学基金(11374156,11204130) 收稿日期:2015-10-11 *通讯联系人,E­mail:tuzhen301@qq.com
更新日期/Last Update: 2016-03-27