摘要
为了测量智能音频设备的声音接收指向性,降低测试系统的成本与复杂度,使用矢量基振幅平移(VBAP)法形成虚拟声场,模拟测量系统所需的物理声场环境。通过仿真验证虚拟声源与实际声源辐射声场的差异,并分析影响导致声场差异的主要因素。在此基础上,使用平面声像仪对虚拟声源进行定位并采集图像,对采集的图像进行像素分析,得到实验测定声源与理想声源之间的位置误差,并对实验数据进行不确定度评估。实验结果表明:双扬声器系统夹角为45°,频率高于2.5 kHz情况下虚拟声源明显偏离预设位置;双扬声器系统夹角为22.5°时,声像仪对频率为500 Hz~2.0 kHz的虚拟声源的最大定位误差可控制在1°附近;对频率为2.6 kHz的虚拟声源,最大定位误差可控制在2.5°附近;当频率高于3.0 kHz后,虚拟声源最大定位误差将大于3°,明显偏离期望位置;频率达到4.0 kHz后,声像仪难以定位虚拟声源位置。
To measure the sound reception directivity of intelligent audio devices and reduce the cost and complexity of the measurement system,the vector-based amplitude panning(VBAP)method is explored to form a virtual sound field simulating the physical sound field environment.The differences between the radiation sound field of the virtual and the actual sound source are verified by simulation,and the main factors affecting the differences of the sound field are analyzed.On this basis,the planar sound imager is used to locate the virtual sound source and capture its images.The pixel analysis of the images is carried out to obtain the position error between the experimental and the ideal sound source,and the uncertainty of the experimental data is evaluated.The experimental results indicate that for a dual-loudspeaker system with an angle of 45°,the virtual sound source significantly deviates from the preset position when the frequency is above 2.5 kHz.When the angle of the dual-loudspeaker system is 22.5°,the maximum localization error of the sound imager for the virtual sound source within approximately 1°in 500 Hz-2.0 kHz.For the virtual sound source with 2.6 kHz,the maximum localization error can be controlled around 2.5°.Once the frequency exceeds 3.0 kHz,the maximum localization error of the virtual sound source will be greater than 3°,significantly deviating from the desired position.When the frequency reaches 4.0 kHz,it is difficult for the acoustic imager to locate the virtual sound source.
作者
钱卓
黄冰
何龙标
陈卫松
桑晋秋
秦朝琪
冯秀娟
牛锋
QIAN Zhuo;HUANG Bing;HE Longbiao;CHEN Weisong;SANG Jinqiu;QIN Zhaoqi;FENG Xiujuan;NIU Feng(National Institute of Metrology,Beijing 100029,China;Anhui Normal University,Wuhu,Anhui 241000,China;East China Normal University,Shanghai 200062,China)
出处
《计量学报》
北大核心
2025年第11期1648-1655,共8页
Acta Metrologica Sinica
