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Baum-Welch algorithm most likely results in underflow in practice. In some literatures, such as “Scaling” algorithm was introduced to solve the problem. In applications, however, some mistakes were found in the equations presented in these literatures. The practical calculations show that the original algorithm often results in poor or even none convergence and rather higher error rate in speech recognition. The mistakes in these literatures and brings forward the correct equations are analysed. The speech recognition system using the revised algorithm can converge well and has lower error rate.
Baum-Welch algorithm most likely results in underflow in practice. In some literatures, such as “Scaling ” algorithm was introduced to solve the problem. In practice, however, some mistakes were found in the equations presented in these literatures. calculations show that the original algorithm often results in poor or even none convergence and rather higher error rate in speech recognition. The mistakes in these literatures and brings forward the correct equations are analysed. The speech recognition system using the revised algorithm can converge well and has lower error rate.