This paper presents an approach to provide of lexical adaptation in Automatic Speech Recognition (ASR) of the disordered speech from a group of young impaired speakers. The outcome of an Acoustic Phonetic Decoder (APD) is used to learn new lexical variants of the 57-word vocabulary and add them to a lexicon personalized to each user. The possibilities of combination of this lexical adaptation with acoustic adaptation achieved through traditional Maximum A Posteriori (MAP) approaches are further explored, and the results show the importance of matching the lexicon in the ASR decoding phase to the lexicon used for the acoustic adaptation.
Bibliographic reference. Saz, Oscar / Lleida, Eduardo / Miguel, Antonio (2009): "Combination of acoustic and lexical speaker adaptation for disordered speech recognition", In INTERSPEECH-2009, 544-547.