A Volumetric SRP with Refinement Step for Sound Source Localization

Markus V. S. Lima, Wallace Alves Martins, Leonardo O. Nunes, Luiz W. P. Biscainho, Tadeu N. Ferreira, Mauricio do V. M. da Costa, Bowon Lee

Abstract: This letter proposes an efficient method based on the steered-response power (SRP) technique for sound source localization using microphone arrays: the refined volumetric SRP (RV-SRP). By deploying a sparser volumetric grid, the RV-SRP achieves a significant reduction of the computational complexity without sacrificing the accuracy of location estimates. In addition, a refinement step improves on the compromise between complexity and accuracy. Experiments conducted in both simulated- and real-data scenarios show that the RV-SRP outperforms state-of-the-art methods in accuracy with lower computational cost.