A Study on the IMTF-Based Filtering on the Modulation Spectrum of Reverberant Signal

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Many methods of speech dereverberation have been proposed to reduce the effects of reverberation. The IMTF (inverse MTF)-based filtering on the power envelope does not need to measure the room impulse response (RIR)、 but the RIR has to be precisely measured before the dereverberation in typical methods. However、 improvement of the restoration accuracy of the restored power envelope is saturated as the reverberation time increases. This is a remaining problem. This paper proposes IMTF-based filtering on the modulation spectrum to resolve the problem. The proposed method estimates the reverberation time on the modulation spectrum and then dereverberates the modulation spectrum of reverberant signal using the IMTF. Three simulations were carried out to evaluate the proposed method. The results showed that the proposed method could adequately restorethe power envelope of a reverberant signal in comparison with the previous method.

identifier:https://dspace.jaist.ac.jp/dspace/handle/10119/9519

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