Sharpening of Angular Spectra Based on a Directional Re-assignment Approach for Ambisonic Sound-field Visualisation

Leo McCormack, Archontis Politis, Ville Pulkki
2019 ICASSP 2019 - 2019 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP)  
This is the accepted version of the original article published by IEEE. ABSTRACT A method for computing and sharpening angular spectra, derived from low-order ambisonic signals, is presented in this paper, which is intended for high-resolution directional sound-field visualisation. The method relies on a re-assignment principle, whereby the directional energy for each grid point is assigned to a new direction, which corresponds to a direction-of-arrival (DoA) estimate within a
more » ... a spatially-localised region, centred around the respective grid point. This leads to the concentration of energy around the true sources, and hence, to sharper angular spectra than that of steered response power (SRP) beamformers of maximum directivity, with the same order of ambisonic input. It is demonstrated that the proposed method, when using loworder input, can achieve similar results to the SRP approach of much higher order.
doi:10.1109/icassp.2019.8683621 dblp:conf/icassp/McCormackPP19 fatcat:zdrdjmiwpzdunkpiu6vdu2jzxu