Spatial multi-channel linear prediction for dereverberation of ad-hoc microphones

Abstract

A spatially modified multi-channel linear prediction analysis is proposed and tested for the dereverberation of ad-hoc microphone arrays. The proposed spatial multi-channel linear prediction takes into account the estimated spatial distances between each microphone and the source and is applied for the short-term dereverberation (pre-whitening). The delayed linear prediction is then applied for the suppression of the late reverberation. Results suggest that the proposed method outperforms the standard linear prediction based methods when applied to the ad-hoc microphones. It is also concluded that the kurtosis of the linear prediction residual signal is a reliable distance feature when the microphone gains are inconsistent and the sources energy levels vary.