- H. Soltau, A. Waibel. 2000. Phone dependent modeling of hyperarticulated effects#. Abstract: In spoken dialogue systems, hyperarticulation occur as an effect to recover previous recognition errors. It is commonly observed that in particular real users ap ply similar recovery strategies as in human-human in teractions. Previous studies have shown that current speech rccogniwr cannot handle hypmarticulated speech. As a.n effect of higher ,vord error rates at hyperartic ulated speech, humans try to reinforce this speaking style which result in even more recognition errors. In this paper, we present approaches to build robust acoustic models for hypcrarticulatcd speech. The key point is that the changes of acoustic features at hyper articulation is a phone dependent effect. The idea is to use the likelihood criterion to decide, which phones should be treated separately. This can be done by in corporating dynamic questions about hyperarticula tion into the clustering stage. Based on such phonetic decision tree, we can generate appropriate acoustic models. \Vith this method, we achieved a word error reduct.ion about 9% relative at. hyperarticulation.
