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作 者:张驰 谢菠荪 ZHANG Chi;XIE Bosun(Acoustic Lab.,School of Physics and Optoelectronics,South China University of Technology,Guangzhou 510641,China)
机构地区:[1]华南理工大学物理与光电学院声学研究所,广州510641
出 处:《应用声学》2024年第1期64-75,共12页Journal of Applied Acoustics
基 金:国家自然科学基金资助项目(12174118)。
摘 要:典型的多通路空间声扬声器布置一般包含水平面左前、右前,高仰角左前上、右前上4个方向的扬声器。该文提出一种利用该4个扬声器产生前方水平与垂直方向虚拟源的一阶局域Ambisonics信号馈给法。该信号馈给法是通过对目标和重放声场进行球谐函数展开并取一阶近似得到。采用简化的头部模型和精确的头相关传输函数模型分析表明,一阶局域Ambisonics信号馈给法可以产生合适的低频听觉定位因素,包括双耳时间差及其随头部转动的动态变化。虚拟源定位实验结果表明,该方法可以在扬声器布置的范围内,甚至在略超出扬声器布置的范围内产生不同方位角和仰角的虚拟源。因而该方法可用在多通路空间声重放中产生与图像配合的虚拟源定位效果。Typical loudspeaker configurations in multichannel spatial sound usually involve loudspeakers in left-front and right-front directions in the horizontal plane as well as in left-front-high and right-front-high directions in a high elevation.Using these four loudspeakers,the present work proposes a method of thefirst-order local Ambisonics signal mixing to recreate horizontal-and vertical-frontal virtual source in spatial sound reproduction.The signal mixing is derived by decomposing the target and reproducing soundfiled with spherical harmonic functions and matching them up to thefirst order.By using a simplified head model and an exact head related transfer function(HRTF)model,it is demonstrated that the signal mixing method can create appropriate directional localization cues at low frequency,including interaural time difference and its dynamic variation with head turning.A virtual source localization experiment indicates that the signal mixing can recreate virtual source in various azimuths and elevations within or even a little bit beyond the range of loudspeaker arrangement.Therefore,the method in present work is applicable to recreate virtual source matching with picture in video-audio reproduction.
关 键 词:局域Ambisonics 虚拟声 定位
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