Improving speech intelligibility by s pre-processing in small to m

One of the reasons that reverberation degrades speech intelligibility is the effect of overlap-masking, in which segments of an acoustic signal are affected by reverberation components of previous segments [Bolt et al., 1949]. To reduce the overlap-masking, Arai et al. suppressed steady-state portions having more energy, but which are less crucial for speech perception, and confirmed promising results for improving speech intelligibility [Arai et al., 2002]. Our goal is to provide a pre-processing filter for each auditorium. To explore the relationship between the effect of a pre-processing filter and reverberation conditions, we conducted a perceptual test with steady-state suppression under various reverberation conditions. The results showed that processed stimuli performed better than unprocessed ones and clear improvements were observed for reverberation conditions of 0.8 1.0s. We certified that steady-state suppression was an effective pre-processing method for improving speech intelligibility under reverberant conditions and proved the effect of overlap-masking.