A modified cross power-spectrum phase method based on microphone array for acoustic source localization

The cross power-spectrum phase (CSP) method plays an important role in time delay estimate due to its efficiency in acoustic source localization. Generally, impacted by the spatial noise and reverberation in a room, the positioning accuracy could be greatly enhanced. However, this method could hardly lead to results when the energy of signal is small. In this paper, a new method is proposed: covariance matrix that from the multi-channel signals were applied and the characteristic of the coherent function was employed. Experiments under various conditions were carried out to demonstrate the new method´s novelty, including adding background music to simulate the real environments. The 240 groups´ data we achieved reached localization accuracy of 97.5% in normal experiments. We also obtained 85.42% and 83.75% correct rate in low and strongly musical environments, respectively.