Efficient Steered-Response Power Methods for Sound Source Localization   Using Microphone Arrays
  This paper proposes an efficient method based on the steered-response power (SRP) technique for sound source localization using microphone arrays: the volumetric SRP (V-SRP). As compared to the SRP, by deploying a sparser volumetric grid, the V-SRP achieves a significant reduction of the computational complexity without sacrificing the accuracy of the location estimates. By appending a fine search step to the V-SRP, its refined version (RV-SRP) improves on the compromise between complexity and accuracy. Experiments conducted in both simulated- and real-data scenarios demonstrate the benefits of the proposed approaches. Specifically, the RV-SRP is shown to outperform the SRP in accuracy at a computational cost of about ten times lower. 
Markus V. S. Lima, Wallace A. Martins, Leonardo O. Nunes, Luiz W. P.   Biscainho, Tadeu N. Ferreira, Maur\'icio V. M. Costa,...
cs.SD