Sixth European Conference on Speech Communication and Technology
This paper presents an improved
MAP method for language model adaptation. The traditional MAP method mixes
the task independent corpus and task dependent corpus using a fixed weight.
In the method presented in this paper, we replaced the fixed weight with
a function of history word. Another work in this paper is that a fuzzy
controller was introduced in adaptation process, and three factors were
used to be the input of the controller, they are:
1) the confidence of the estimation value,
2) the importance of the word,
3) the difference between the estimation value from the general corpus and from the adaptive corpus.
The experiments showed that the improved method has the better performance than traditional model.
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Bibliographic reference. Chen, Langzhou / Huang, Taiyi (1999): "An improved MAP method for language model adaptation", In EUROSPEECH'99, 1923-1926.