Room reverberation causes two perceptual distortions on clean speech: Coloration and long-term reverberation. These two effects correspond to two physical variables: Signal-toreverberant energy ratio (SRR) and reverberation time, respectively. Based on thi

Toconclude,wehavepresentedatwo-stagereverberantspeechenhancementalgorithmusingonemicrophone,andthestagescorrespondtoinversefilteringandspectralsubtraction.Theevaluationsshowthatouralgorithmenhancesthequalityofreverberantspeecheffectivelyandperformssignificantlybetterthanarecentreverberantspeechenhancementalgorithm.

AcknowledgmentsThisresearchwassupportedinpartbyanNSFgrant(IIS-0081058)andanAFOSRgrant(FA9550-04-1-0117).

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2000.

(a)

(b)

(c)

(d)

(e)

(f)

(g)

Time(sec)

(h)

Fig.2.Resultsofreverberantspeechenhancement:(a)cleanspeech,(b)spectrogramofcleanspeech,(c)reverberantspeech,(d)spectrogramofreverberantspeech,(e)speechprocessedusingtheYMalgorithm,(f)spectrogramof(e),(g)speechprocessedusingouralgorithm,and(h)spectrogramof(g).Thespeechisafemaleutterance“Shehadyourdarksuitingreasywashwaterallyear,”sampledat8kHz.

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