Go To Program 106 A Two-Step Approach to Blindly Infer Room Geometries Jason Filos 1 Emanuel Habets 1 Patrick A Naylor 1 1 Electrical and Electronic Engineering, Imperial College London, London, United Kingdom An approach to blindly infer the geometry of an acoustic enclosure by estimating the location of reflective surfaces based on at least three channel estimates and relative microphone positions is presented. While blind system identification processes can be used to estimate the impulse responses of a single-input-multiple-output system, the propagation time of the direct sound cannot be directly observed. Because this propagation time is essential to infer the location of reflective surfaces, we propose a two-step approach. As a first step the time differences of arrival of the direct-paths are used to estimate the propagation time of the direct sound from the source to a reference microphone. Subsequently, the propagation times of all other arrivals can be inferred. In the second step the propagation times associated with the path of each first-order reflection are constrained to estimate the location of the reflectors and hence infer the geometry of the room. Preliminary results obtained using simulated acoustic impulse responses show that the proposed approach can be used to infer the room geometry when the propagation times of the first-order reflections can be identified. View pdf