论文标题
AMBISONIC域中移动源的启用回波方向和范围估计
Echo-enabled Direction-of-Arrival and range estimation of a mobile source in Ambisonic domain
论文作者
论文摘要
众所周知，在混响环境中，远场声源的范围估计是一个众所周知的困难问题，因此，大多数定位方法仅能够估计源的到达方向（DOA）。在较早的工作中，我们已经证明，在某些限制性的声学条件下，鉴于反射表面的方向，人们可以利用主流的声学反射来评估Ambisonic域中与静态声源的距离。在本文中，我们利用最近提出的广义时域速度向量（GTVV）表示，将这些数量估算为移动的声源，而没有对反射器方向的先验知识。我们表明，移动源的轨迹和相应的反射在空间和时间上相关，可用于推断传播源信号的绝对延迟，因此近似麦克风到源距离。实际声音数据的实验证实了所提出方法的有效性。
Range estimation of a far field sound source in a reverberant environment is known to be a notoriously difficult problem, hence most localization methods are only capable of estimating the source's Direction-of-Arrival (DoA). In an earlier work, we have demonstrated that, under certain restrictive acoustic conditions and given the orientation of a reflecting surface, one can exploit the dominant acoustic reflection to evaluate the DoA \emph{and} the distance to a static sound source in Ambisonic domain. In this article, we leverage the recently presented Generalized Time-domain Velocity Vector (GTVV) representation to estimate these quantities for a moving sound source without an a priori knowledge of reflectors' orientations. We show that the trajectories of a moving source and the corresponding reflections are spatially and temporally related, which can be used to infer the absolute delay of the propagating source signal and, therefore, approximate the microphone-to-source distance. Experiments on real sound data confirm the validity of the proposed approach.
