Modeling pronunciation variation with context-dependent articulatory feature decision trees

We consider the problem of predicting the surface pronunciations of a word in conversational speech, using a model of pronunciation variation based on articulatory features. We build context-dependent decision trees for both phone-based and feature-based models, and compare their perplexities on conversational data from the Switchboard Transcription Project. We find that a fully-factored model, with separate decision trees for each articulatory feature, does not perform well, but a feature-based model using a smaller number of "feature bundles" outperforms both the fully-factored model and a phonebased model. The articulatory feature-based decision trees are also much more robust to reductions in training data. We also analyze the usefulness of various context variables.

• Type: Journal
• Year: 2010
• Where: INTERSPEECH
• Authors: Sam Bowman, Karen Livescu
• Keywords: Articulatory Feature, Feature-based Model, INTERSPEECH 2010, Model, Signal Processing