Suksiri Bandhit, Fukumoto Masahiro
Department of Engineering, Graduate School of Engineering, Kochi University of Technology, Kami Campus, Kochi 782-0003, Japan.
School of Information, Kochi University of Technology, Kami Campus, Kochi 782-0003, Japan.
Sensors (Basel). 2019 Jul 5;19(13):2977. doi: 10.3390/s19132977.
This paper presents an efficient framework for estimating the direction-of-arrival (DOA) of wideband sound sources. The proposed framework provides an efficient way to construct a wideband cross-correlation matrix from multiple narrowband cross-correlation matrices for all frequency bins. In addition, the proposed framework is inspired by the coherent signal subspace technique with further improvement of linear transformation procedure, and the new procedure no longer requires any process of DOA preliminary estimation by exploiting unique cross-correlation matrices between the received signal and itself on distinct frequencies, along with the higher-order generalized singular value decomposition of the array of this unique matrix. Wideband DOAs are estimated by employing any subspace-based technique for estimating narrowband DOAs, but using the proposed wideband correlation instead of the narrowband correlation matrix. It implies that the proposed framework enables cutting-edge studies in the recent narrowband subspace methods to estimate DOAs of the wideband sources directly, which result in reducing computational complexity and facilitating the estimation algorithm. Practical examples are presented to showcase its applicability and effectiveness, and the results show that the performance of fusion methods perform better than others over a range of signal-to-noise ratios with just a few sensors, which make it suitable for practical use.
本文提出了一种用于估计宽带声源到达方向（DOA）的高效框架。所提出的框架提供了一种有效的方法，可从所有频率 bins 的多个窄带互相关矩阵构建宽带互相关矩阵。此外，所提出的框架受相干信号子空间技术的启发，并对线性变换过程进行了进一步改进，新过程不再需要通过利用接收信号与其自身在不同频率上的独特互相关矩阵以及该独特矩阵阵列的高阶广义奇异值分解来进行 DOA 初步估计的任何过程。通过采用任何基于子空间的技术来估计窄带 DOA，但使用所提出的宽带相关性而非窄带相关矩阵，来估计宽带 DOA。这意味着所提出的框架使近期窄带子空间方法中的前沿研究能够直接估计宽带源的 DOA，从而降低计算复杂度并简化估计算法。给出了实际示例以展示其适用性和有效性，结果表明融合方法的性能在一系列信噪比下仅使用少数传感器时比其他方法表现更好，这使其适用于实际应用。
