Robust acoustic direction of arrival estimation using Root-SRP-PHAT, a realtime implementation

Wideband robust direction of arrival estimation using microphone arrays is associated with computationally complex algorithms, unsuitable for implementation on low power devices. This paper improves on the computational complexity by devising an algorithm based on steered response interpolation combined with steered response power estimation employing root solving. The new algorithm is implemented in a PC-based realtime system and has been compared to Root-MUSIC and Far-Field SRP-PHAT. The comparison was performed with regards to computational load and robustness to noise and reverberation in a real room environment. The results show that the new algorithm is the most computationally efficient, while providing superior robustness compared to Root-MUSIC.