简介：Baum-Welchalgorithmmostlikelyresultsinunderflowinpractice.Insomeliteratures,suchas"Scaling"algorithmwasintroducedtosolvetheproblem.Inapplications,however,somemistakeswerefoundintheequationspresentedintheseliteratures.Thepracticalcalculationsshowthattheoriginalalgorithmoftenresultsinpoororevennoneconvergenceandratherhighererrorrateinspeechrecognition.Themistakesintheseliteraturesandbringsforwardthecorrectequationsareanalysed.Thespeechrecognitionsystemusingtherevisedalgorithmcanconvergewellandhaslowererrorrate.
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