A blind subband-based dereverberation algorithm

In this work, we develop a two-stage blind dereverberation scheme for reverberant speech enhancement. The proposed algorithm operates by first splitting the reverberant inputs into different subbands. In the first stage, the inverse filters are estimated using the blind multiple input-output inverse-filtering theorem (MINT), while in the second stage our approach suppresses late reverberant energy by subtracting the power spectrum of the late impulse components from the power spectrum of the inverse filtered speech signal. Experimental results with reverberant speech indicate that the performance of the proposed algorithm is substantially better when compared to existing dereverberation algorithms.