A Two-Stage Algorithm for Enhancement of Reverberant Speech
Mingyang Wu, DeLiang Wang · 2006
Room reverberation causes two perceptual distortions on clean speech: coloration and long-term reverberation. These two effects correspond to two physical variables: signal-to-reverberant energy ratio (SRR) and reverberation time, respectively. Based on this observation, we propose a two-stage algorithm that enhances reverberant speech from one-microphone recordings. In the first stage, an inverse filter is estimated to reduce coloration effects or increase SRR. The second stage employs spectral subtraction to minimize the influence of long-term reverberation. The proposed algorithm significantly improves the quality of reverberant speech. A comparison with a recent one-microphone enhancement algorithm shows that our system produces significantly better results.