title: A probabilistic model for binaural sound localization.
abstract: This paper proposes a biologically inspired and technically implemented sound localization system to robustly estimate the position of a sound source in the frontal azimuthal half-plane. For localization, binaural cues are extracted using cochleagrams generated by a cochlear model that serve as input to the system. The basic idea of the model is to separately measure interaural time differences and interaural level differences for a number of frequencies and process these measurements as a whole. This leads to two-dimensional frequency versus time-delay representations of binaural cues, so-called activity maps. A probabilistic evaluation is presented to estimate the position of a sound source over time based on these activity maps. Learned reference maps for different azimuthal positions are integrated into the computation to gain time-dependent discrete conditional probabilities. At every timestep these probabilities are combined over frequencies and binaural cues to estimate the sound source position. In addition, they are propagated over time to improve position estimation. This leads to a system that is able to localize audible signals, for example human speech signals, even in reverberating environments.
authors.affiliation: Control Theory and Robotics Lab, Institute of Automatic Control, Darmstadt University of Technology, 64283 Darmstadt, Germany. volker.willert@rtr.tu-darmstadt.de
authors.forename: Volker
authors.initials: V
authors.lastname: Willert
authors.forename: Julian
authors.initials: J
authors.lastname: Eggert
authors.forename: Jürgen
authors.initials: J
authors.lastname: Adamy
authors.forename: Raphael
authors.initials: R
authors.lastname: Stahl
authors.forename: Edgar
authors.initials: E
authors.lastname: Körner
mesh_terms: D001185:Artificial Intelligence; D032701:Biomimetics / Q000379:methods*; D003198:Computer Simulation; D006801:Humans; D008959:Models, Neurological; D015233:Models, Statistical; D009415:Nerve Net / Q000502:physiology*; D046709:Pattern Recognition, Physiological / Q000502:physiology*; D013017:Sound Localization / Q000502:physiology*; D013018:Sound Spectrography / Q000379:methods*