A phase-based dual microphone method to count and locate audio sources in reverberant rooms

This paper presents an off-line method to estimate the mixing conditions, characterized by the number of audio sources and their time difference of arrival (TDOA). The proposed method is based on the assumption of having, at least, one time frame where each one of the sources is dominant. From such frames, the TDOA of the correspondent dominant source is estimated by maximizing a novel coherence function similar to the linear regression proposed in. Finally, the number of sources will be derived by counting the number of active directions of arrival (DOA). Experimental results on real-life recordings are presented, showing the good performance of the algorithm in reverberant environments.