1. A computer-implemented process for estimating the time delay of arrival (TDOA) between a pair of audio sensors of a microphone array, comprising using a computer to perform the following process actions: inputting signals generated by the audio sensors; and estimating the TDOA using a generalized cross-correlation (GCC) technique which, employs a provision for reducing the influence from correlated ambient noise, and employs a weighting factor for reducing the influence from reverberation noise.