Direction-of-arrival and power spectral density estimation using a single directional microphone
Elisa Tengan, Maja Taseska, Thomas Dietzen, Toon van Waterschoot · 2021 29th European Signal Processing Conference (EUSIPCO) · 2021
A method is proposed for estimating direction-of-arrival (DOA) and power spectral density (PSD) of stationary point source signals using a single, rotating, directional microphone. By considering different microphone orientations for different time frames, the DOA is estimated by locating the maxima in an estimated PSD vector obtained by solving a group-sparsity constrained optimization problem using a dictionary composed of the known microphone response sampled on an angular grid. The estimated DOAs are then used for obtaining an overdetermined least squares problem with a nonnegativity constraint for re-estimating the PSD of the point source signals. The DOA estimation performance is compared between cases of different frequency-dependent microphone directivity patterns, as well as with the MUSIC algorithm for 6-element uniform linear and circular microphone arrays. The proposed stationary point source PSD estimation using DOA information is compared with traditional single-channel methods for PSD estimation employing minimum statistics and MMSE-based approaches for a rotating microphone setup, one speech source and one stationary interfering point source.