Robust Source Localization and Enhancement With a Probabilistic Steered Response Power Model

—Source localization and enhancement are often treated separately in the array processing literature. One can apply Steered Response Power (SRP) localization to determine the sources’ Directions-Of-Arrival (DOA) followed by beamforming and Wiener post-filtering to isolate the sources from each other and ambient interference. We show that when there is significant overlap between directional sources of interest in the TimeFrequency (TF) plane, traditional SRP localization breaks down. This may occur, for example, when the array is located near a reflector, significant early reflections are present, or the sources are harmonized. We propose a joint solution to the localization and enhancement problems via a probabilistic interpretation of the SRP function. We formulate optimization procedures for (1) a mixture of single-source SRP distributions (MoSRP) and (2) a multi-source SRP distribution (MultSRP). Unlike in traditional localization, the latter approach explicitly models sou...

• Type: Journal
• Year: 2016
• Where: TASLP
• Authors: Johannes Traa, David Wingate, Noah D. Stein, Paris Smaragdis
• Keywords: Software Engineering, TASLP 2016