Unit Selection

From SpeechWiki

Error driven unit selection

Some statistics

The probability of a particular phone occurring in the corpus, and the probability of a particular phone that is correct in the corpus

The Confusion matrix

The confusion matrix ignoring EOW and various non-speech events

The number of triphone decision tree leaf nodes is essentially not correlated with any of {total Frames,total Phones, error Phones, error Frames} per phone. Since the units are chosen to maximally cover the mistakes in the corpus, this might suggest that deepening the triphone DTs is not the same thing as coming up with these error-based units.

Syllable Units