7th International Conference on Spoken Language Processing

September 16-20, 2002
Denver, Colorado, USA

Decision Tree Distribution Tying Based on a Dimensional Split Technique

Heiga Zen, Keiichi Tokuda, Tadashi Kitamura

Nagoya Institute of Technology, Japan

In this paper, a new clustering technique called Dimensional Split Phonetic Decision Tree (DS-PDT) is proposed. In DSPDT, state distributions are split dimensionally when applying phonetic question. This technique is an extension of the decision tree based acoustic modeling. It gives a proper context-dependent sharing structure of each dimension automatically while maintaining the correlations among the dimensions. In speaker-independent continuous speech recognition experiments, DS-PDT achieved about 8% error reduction over the phonetic decision tree clustering.


Full Paper

Bibliographic reference.  Zen, Heiga / Tokuda, Keiichi / Kitamura, Tadashi (2002): "Decision tree distribution tying based on a dimensional split technique", In ICSLP-2002, 1257-1260.