简介：Thisstudyproposesapost-processortoimprovetheharmonicstructureofavowelinanenhancedspeech,enablingthespeechqualitytobeimproved.Initially,aspeechenhancementalgorithmisemployedtoreducethebackgroundnoiseforanoisyspeech.Hencetheenhancedspeechispost-processedbyahybrid-medianfiltertoreducethemusicaleffectofresidualnoise.Sincetheharmonicspectraareimpactedbybackgroundnoiseandaspeechenhancementprocess,thequalityofavowelisdeteriorated.Aharmonicregeneratedmethodisdevelopedtoimprovethequalityofpost-processedspeech.Experimentalresultsshowthattheproposedmethodcanimprovethequalityofpost-processedspeechbyadequatelyregeneratingharmonicspectra.

简介：AnewschemebasedonSOA-MZIforall-optical2Rregenerationisproposed.Thecharacteristicsofgainandswitchingwindowofthisdeviceareinvestigatedindetail.Numericalsimulationresultsindicatethatthenonlineargaincompression,thetimedelaybetweentheinputopticalsignalandthewidthoftheopticalpulseareessentialparametersforagoodperformanceofall-optical2Rregeneration.