EUROSPEECH 2003 - INTERSPEECH 2003
In this paper, a new decision tree-based clustering technique called Phonetic, Dimensional and State Positional Decision Tree (PDS-DT) is proposed. In PDS-DT, phonetic contexts, dimensions and state positions are grouped simultaneously during decision tree construction. PDS-DT provides a complicate distribution sharing structure without any external control parameters. In speaker-independent continuous speech recognition experiments, PDS-DT achieved about 13%-15% error reduction over the phonetic decision tree-based state-tying technique.
Bibliographic reference. Zen, Heiga / Tokuda, Keiichi / Kitamura, Tadashi (2003): "Decision tree-based simultaneous clustering of phonetic contexts, dimensions, and state positions for acoustic modeling", In EUROSPEECH-2003, 3189-3192.