Efficient Steered-Response Power Methods for Sound Source Localization Using Microphone Arrays
This work addresses efficiency improvements for sound source localization, which is incremental but beneficial for real-time audio processing applications.
The paper tackles the computational complexity of sound source localization using microphone arrays by proposing volumetric SRP (V-SRP) and its refined version (RV-SRP), which reduce computational cost by about ten times while improving accuracy compared to standard SRP.
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.