Linear input network based speaker adaptation in the Dialogos system

Describes an activity devoted to experiment linear input networks (LIN) as a speaker adaptation technique for the neural recognition module of the Dialogos(R) system. The LIN technique is experimented with and some variants devoted to reduce the number of estimated parameters are introduced. The obtained results confirm the validity of LIN for speaker adaptation, while the introduced variants are a valid alternative when a reduced model size is important. The potentialities and drawbacks of supervised and unsupervised speaker adaptation are illustrated. Experimentations with a speaker dependent data base collected from real interactions with the Dialogos system are described in detail showing, in both cases, a relevant improvement in comparison with the speaker independent model.