Exploiting Microphone Array Symmetry for Robust Two-Dimensional Polynomial Beamforming

摘要

Polynomial beamforming is an effective approach for flexible beam steering of a data-independent beamformer. To this end, the beamformer is designed for a finite set of predefined Prototype Look Directions (PLDs) and its main beam is steered by polynomial interpolation between those PLDs. In this work, the complexity of a recently proposed two-dimensional robust polynomial beamformer is significantly decreased by exploiting symmetry planes of the microphone array to reduce the number of PLDs used for the beamformer design. This concept is experimentally verified for a planar uniform circular microphone array by means of signal-independent measures.