Sound Field Estimation in Region Including Scattering Objects based on Kernel Interpolation: Evaluation for Various Scatterers

A method for estimating the incident sound field in a region containing scattering objects is extensively evaluated for various scatterers. Estimating a sound field using multiple microphones has a wide variety of applications, e.g., spatial audio capturing and spatial active noise control. Most current methods do not allow the inclusion of any scattering objects or allow only the inclusion of scattering objects of known properties. An incident sound field estimation method in a region including scattering objects of unknown properties has recently been proposed, which has high practical potential in the above-mentioned applications. However, its experimental evaluation is limited to a simple rigid spherical object even though various types of scatterers can be present in practical situations. We evaluate the incident sound field estimation method for various types of scatters in numerical simulations using the boundary element method. Experimental results indicated that the appropriate design of the weighting matrix for expansion coefficients can further improve the estimation accuracy.