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

Budapest, Hungary
September 5-9, 1999

Linguistic Tree Based Maximum Likelihood Model Interpolation

Liu Feng, Chi-wei Che (1), Peng Yu, Zuoying Wang

Speech Processing Lab., EE Depart., Tsinghua Univ., Beijing, China
(2) Philips Innovation Center, Taipei, Taiwan

In this paper, a speaker adaptation method is presented which computes the speaker adapted model by a weighted sum of a set of speaker dependent models. The set of weights are estimated to maximize the likelihood of the adaptation data. Then a linguistic tree is constructed to cluster the mean vectors. The means in the same linguistic class share the same weight set, while the means in different classes use different weight set to compute the adapted model. Experiments show that with as little as 1-3 sentences a significant performance improvement is obtained. As more adaptation data is available, further improvement can be obtained.


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Bibliographic reference.  Feng, Liu / Che, Chi-wei / Yu, Peng / Wang, Zuoying (1999): "Linguistic tree based maximum likelihood model interpolation", In EUROSPEECH'99, 2511-2514.