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Speaker Direction-of-Arrival Estimation Based on Frequency-Independent Beampattern

Feng Guo, Yuhang Cao, Zheng Liu, Jiaen Liang, Baoqing Li, Xiaobing Yuan

The differential microphone array (DMA) becomes more and more popularrecently. In this paper, we derive the relationship between the direction-of-arrival(DoA) and DMA’s frequency-independent beampatterns. The derivationdemonstrates that the DoA can be yielded by solving a trigonometricpolynomial. Taking the dipoles as a special case of this relationship,we propose three methods to estimate the DoA based on the dipoles.However, we find these methods are vulnerable to the axial directionsunder the reverberation environment. Fortunately, they can complementeach other owing to their robustness to different angles. Hence, toincrease the robustness to the reverberation, we proposed another newapproach by combining the advantages of these three dipole-based methodsfor the speaker DoA estimation. Both simulations and experiments showthat the proposed method not only outperforms the traditional methodsfor small aperture array but also is much more computationally efficientwith avoiding the spatial spectrum search.