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.