Binaural localization and detection of speakers in complex acoustic scenes

The robust localization of speech sources is required for a wide range of applications, among them hearing aids and teleconferencing systems. This chapter focuses on binaural approaches to estimate the spatial position of multiple competing speakers in adverse acoustic scenarios by only exploiting the signals reaching both ears. A set of experiments is conducted to systematically evaluate the impact of reverberation and interfering noise on speaker-localization performance. In particular, the spatial distribution of the interfering noise has a considerable effect on speaker-localization performance, being most detrimental if the noise field contains strong directional components. In these conditions, interfering noise might be erroneously classified as a speaker position. This observation highlights the necessity to combine the localization stage with a decision about the underlying source type in order to enable a robust localization of speakers in noisy environments