Tracking array deformations using segmented least squares

Abstract

Recording on moving devices leads to constant deformations in microphone array structure, which interferes with spatial audio processing. Previously, we have established that there is a locally linear mapping between the manifolds of relative transfer functions (RTF) and array geometries. This mapping also applies to trajectories of array deformations and their corresponding RTFs. We run segmented least squares (SLS) on the RTF trajectories to discern potential states of motion in an unsupervised manner. We then examine an implementation of SLS for adaptive beamforming in a deformable setting.