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A robust method for linear array is proposed to address the difficulty ofdirection-of-arrival (DOA) estimation in reverberant and noisy environments. Adirect-path dominance test based on the onset detection is utilized to extracttime-frequency bins containing the direct propagation of the speech. Theinfluence of the transient noise, which severely contaminates the onset test,is mitigated by a proper transient noise determination scheme. Then for voicefeatures, a two-stage procedure is designed based on the extracted bins and aneffective dereverberation method, with robust but possibly biased estimationfrom middle frequency bins followed by further refinement in higher frequencybins. The proposed method effectively alleviates the estimation bias caused bythe linear arrangement of microphones, and has stable performance under noisyand reverberant environments. Experimental evaluation using a 4-elementmicrophone array demonstrates the efficacy of the proposed method.

A robust DOA estimation method for a linear microphone array under reverberant and noisy environments