EUROSPEECH 2001 Scandinavia
7th European Conference on Speech Communication and Technology

Aalborg, Denmark
September 3-7, 2001


Learning of User Formulations for Business Listings in Automatic Directory Assistance

C. Popovici (1), M. Andorno (1), P. Laface (1), L. Fissore (2), M. Nigra (2), C. Vair (2)

(1) Politecnico di Torino, Italy; (2) Loquendo, Italy

Automatic Directory Assistance (DA) for business listings poses many application specific problems. One of the main problem is that customers formulate their requests for the same listing with great variability. We present the results of a study aiming at automatic learning, from field data, of expressions typically used by customers to formulate their requests for the most frequent business listings. We use a clustering procedure that exploits the association of the phonetic string produced by a lexical unconstrained search for a given denomination pronounced by the user and the phone number provided by the system or by the human operator, in case of failure of the automatic DA service. We show that an unsupervised approach allows to detect user formulations that were not foreseen by the designers, and that can be added, as variants, to the denominations already included in the system to reduce its failures.

Full Paper

Bibliographic reference.  Popovici, C. / Andorno, M. / Laface, P. / Fissore, L. / Nigra, M. / Vair, C. (2001): "Learning of user formulations for business listings in automatic directory assistance", In EUROSPEECH-2001, 2325-2328.