A geometrical approach to room compensation for sound field rendering applications

In this paper we propose a method for reducing the impact of room reflections in sound field rendering applications. Our method is based on the modeling of the acoustic paths (direct and reflected) from each of the loudspeakers of the rendering system, and a set of control points in the listening area. From such models we derive a propagation matrix and compute its least-squares inversion. Due to its relevant impact on the spatial impression, we focus on the early reflections part of the Room Impulse Response, which is conveniently estimated using the fast beam tracing modeling engine. A least squares problem is formulated in order to derive the compensation filter. We also demonstrate the robustness of the proposed solution against errors in geometric measurement of the hosting environment.