A tracking algorithm of speaker direction using microphones located at vertices of equilateral-triangle

In this paper, we propose a tracking algorithm of speaker direction using microphones located at vertices of an equilateral triangle. The method realizes tracking by minimizing a performance index that consists of the cross spectra at three different microphone pairs in the triangular array. For guaranteeing global convergence to the correct direction with accuracy, we use the steepest descent method with the weighted cross spectra at harmonic frequencies of voiced sound. During the adaptation, the weights are altered depending on the convergence state. Through some computer simulation and experiments in a real acoustic environment, we show the effectiveness of the proposed method.