Discriminative training techniques for Hidden-Markov Models were recently proposed and successfully applied for automatic speech recognition. In this paper a discussion of the Minimum Classification Error and the Maximum Mutual Information objective is presented. An extended reestimation formula is used for the HMM parameter update for both objective functions. The discriminative training methods were utilized in speaker independent phoneme recognition experiments and improved the phoneme recognition rates for both discriminative training techniques.
Bibliographic reference. Reichl, Wolfgang / Ruske, Günther (1995): "Discriminative training for continuous speech recognition", In EUROSPEECH-1995, 537-540.