Sixth European Conference on Speech Communication and Technology
(EUROSPEECH'99)

Budapest, Hungary
September 5-9, 1999

Selective Prosodic Post-Processing for Improving Recognition of French Telephone Numbers

Katarina Bartkova, Denis Jouvet

France TÚlÚcom, CNET/DIH/DIPS, Lannion, France

This study describes a selective prosodic post-processing procedure for improving the recognition of telephone numbers in French. The aim of the post-processing procedure is to recover recognition errors made by an HMM based ASR system. Instead of a global post-processing, this paper proposes a selective one. Post-processing is carried out only on some recognised numbers and only if its associated frequent confusion is also present in the N-best candidates. In such a case the discrimination between the solutions is carried out by checking the duration of a specific segment in a pertinent prosodic position. On the different data used in this study, about 23 % of the substitution errors are considered as being possible to recover with the selective duration post-processing and of this amount about 40 % of the errors are actually recovered.


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Bibliographic reference.  Bartkova, Katarina / Jouvet, Denis (1999): "Selective prosodic post-processing for improving recognition of French telephone numbers", In EUROSPEECH'99, 267-270.