As a sound source localization method using two microphones, GRODMIC (GROup Delay between MICrophones) has been developed. GRODMIC estimates the time differences of arrival between microphones based on the group delay characteristics corresponding to a propagation delay characteristic identified by a digital filter. However, ripples in the group delay characteristics often reduce estimation accuracy. To address this issue, the extraction of reliable flat group delay samples has been proposed. In this study, for a single speech signal, high-density group delay samples are extracted by focusing on the temporal consistency of the signal, in order to further improve localization accuracy. The effectiveness of the proposed method is demonstrated through experimental results.
Hatano et al. (Sat,) studied this question.