  We describe a new method for estimating the direction of sound in a
reverberant environment from basic principles of sound propagation. The method
utilizes SNR-adaptive features from time-delay and energy of the directional
components after acoustic wave decomposition of the observed sound field to
estimate the line-of-sight direction under noisy and reverberant conditions.
The effectiveness of the approach is established with measured data of
different microphone array configurations under various usage scenarios.
