Sound Field Interpolation with Unsupervised Calibration for Freely Spaced Circular Microphone Array in Rotation-Robust Beamforming

This paper introduces a new approach to perform unequally spaced sound field interpolation (SFI) for beamforming using a freely spaced circular microphone array (CMA) that is robust to rotation. Unlike previous methods that required a known microphone distribution, the proposed approach uses unsupervised calibration to estimate the error angle of each microphone. This is accomplished through an innovative optimization problem, making it practical for CMAs with freely spaced microphones. By using only the number of channels and rotation angle, the proposed method enables accurate unequally spaced SFI. Experimental results show that the proposed method outperforms previous methods on freely spaced CMAs.