Sixth European Conference on Speech Communication and Technology
(EUROSPEECH'99)

Budapest, Hungary
September 5-9, 1999

A Combined Maximum Mutual Information and Maximum Likelihood Approach for Mixture Density Splitting

Ralf Schlüter, Wolfgang Macherey, Boris Müller, Hermann Ney

Lehrstuhl für Informatik VI, RWTH Aachen - University of Technology Aachen, Germany

In this work a method for splitting continuous mixture density hidden Markov models (HMM) is presented. The approach com-bines a model evaluation measure based on the Maximum Mutual Information (MMI) criterion with subsequent standard Max-imum Likelihood (ML) training of the HMMparameters. Experiments were performed on the SieTill corpus for telephone line recorded German continuous digit strings. The proposed split-ting approach performed better than discriminative training with conventional splitting and as good as discriminative training after the new splitting approach.


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Bibliographic reference.  Schlüter, Ralf / Macherey, Wolfgang / Müller, Boris / Ney, Hermann (1999): "A combined maximum mutual information and maximum likelihood approach for mixture density splitting", In EUROSPEECH'99, 1715-1718.