Adaptive realization of the phase transform for time delay estimation

This paper introduces two recursive realizations of the Phase Transform (PHAT) processor for time delay estimation (TDE), using a simple one-pole lowpass filter and the least mean square (LMS) adaptive filter, respectively. It is shown that these adaptive methods are very effective in reducing the effect of interfering tonals. The performances of these methods are compared with those of other existing adaptive TDE algorithms via computer simulations.