Abstract
Although a number of dereverberation methods have been studied, dereverberation is still a challenging problem especially when using a single microphone. An important aspect of single-channel speech enhancement is the characteristic feature of speech signals that allows us to restore the quality of source signals. In this chapter, we describe a single-channel speech dereverberation method based on the harmonicity of speech signals. We show that a filter that enhances the harmonic structure of reverberant speech signals approximates the inverse filter of the reverberation process, thus enabling us to achieve high quality blind dereverberation. The presented method is referred to as the harmonicity based dereverberation method, HERB. Simulation experiments show that HERB can work effectively to dereverberate speech signals in terms of energy decay curves of room impulse responses and automatic speech recognition performance even when the reverberation time is as long as 1.0 sec provided a sufficiently large number of observed signals are available. Further discussions on several future directions are also provided with a view to extending HERB so that it can cope with more realistic situations.
Published Version
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