Acoustic Beamforming in Front of a Reflective Plane. Stefanakis, N., Delikaris-Manias, S., & Mouchtaris, A. In 2018 26th European Signal Processing Conference (EUSIPCO), pages 26-30, Sep., 2018.
Acoustic Beamforming in Front of a Reflective Plane [pdf]Paper  doi  abstract   bibtex   
In this paper, we consider the problem of beamforming with a planar microphone array placed in front of a wall of the room, so that the microphone array plane is perpendicular to that of the wall. While this situation is very likely to occur in a real life problem, the reflections introduced by the adjacent wall can be the cause of a serious mismatch between the actual acoustic paths and the traditionally employed free-field propagation model. We present an adaptation from the free-field to the so-called reflection-aware propagation model, that exploits an in-situ estimation of the complex and frequency-dependent wall reflectivity. Results presented in a real environment demonstrate that the proposed approach may bring significant improvements to the beamforming process compared to the free-field propagation model, as well as compared to other reflection-aware models that have been recently proposed.

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