Hemispherical Harmonics based Acoustic Source Localization in Mixed-field

In this paper, a unified data model is presented for mixed-field (MF) source localization using hemispherical microphone array (HMA). Mode strength based data model for MF source localization is formulated. The proposed MF mode strength accounts for both near-field (NF) and far-field (FF) sources. As the data is only present over hemisphere, rather than spherical harmonics (SH), hemispherical harmonics (HSH) basis functions have been utilized. The HSH basis functions provide a more accurate representation of the data over the hemisphere. Optimum source localization algorithms such as multiple signal classification (MUSIC) and minimum variance distortionless response (MVDR) are formulated in HSH domain to estimate the range and bearing for the MF sources. Root mean square error (RMSE) and probability of resolution measures at various signal to noise ratio (SNR) are provided to evaluate the proposed algorithms.

[1]  Boaz Rafaely,et al.  Near-Field Spherical Microphone Array Processing With Radial Filtering , 2011, IEEE Transactions on Audio, Speech, and Language Processing.

[2]  Alastair H. Moore,et al.  Direction of Arrival Estimation in the Spherical Harmonic Domain Using Subspace Pseudointensity Vectors , 2017, IEEE/ACM Transactions on Audio, Speech, and Language Processing.

[3]  Rajesh M. Hegde,et al.  Near-Field Acoustic Source Localization and Beamforming in Spherical Harmonics Domain , 2016, IEEE Transactions on Signal Processing.

[4]  R. O. Schmidt,et al.  Multiple emitter location and signal Parameter estimation , 1986 .

[5]  Qinghua Huang,et al.  Improving Decoupled Spherical Harmonics ESPRIT Using Structured Least Squares , 2018, IEEE Access.

[6]  Huawei Chen,et al.  Multiple Speech Sources Localization in Room Reverberant Environment Using Spherical Harmonic Sparse Bayesian Learning , 2019, IEEE Sensors Letters.

[7]  Boaz Rafaely,et al.  Acoustic analysis by spherical microphone array processing of room impulse responses. , 2012, The Journal of the Acoustical Society of America.

[8]  Tong Wang,et al.  Acoustic source localization in mixed field using spherical microphone arrays , 2014, EURASIP J. Adv. Signal Process..

[9]  Boaz Rafaely,et al.  Fundamentals of Spherical Array Processing , 2015, Springer Topics in Signal Processing.

[10]  Walter Kellermann,et al.  Robust localization of multiple sources in reverberant environments using EB-ESPRIT with spherical microphone arrays , 2011, 2011 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP).

[11]  Zhiyun Li,et al.  Hemispherical microphone arrays for sound capture and beamforming , 2005, IEEE Workshop on Applications of Signal Processing to Audio and Acoustics, 2005..