Domain adduced state tying for cross-domain acoustic modelling
Rita Singh, B. Raj, Richard M. Stern · 1999
Homophone words is one of the specific problems of Automatic Speech Recognition (ASR) in French. Moreover, this phenomenon is particularly high for some inflections like the singular/plural inflection (72% of the 40.7K lemma of our 240K word dictionary have inflected forms which are homophonic). In order to take into account worddependencies spanning over a variable number of words, it is interesting to merge local language models, like 3-gram or 3-class models, with largespan models. We present in this paper two kinds of models : a phrase-based model, using phrases obtained from a training corpus by means of a finite-state parser; a homophone cache-based model, using derivation of constraints from word histories stored in a cache memory.