The development of a high-performance telephone-bandwidth speaker independent connected digit recognizer for Italian is described. The CSLU Speech Toolkit was used to develop and implement the hybrid ANN/HMM system, which is trained on context-dependent categories to account for coarticulatory variation. Various front-end processing and system architectures were compared and, when the best features (MFCC with CMS + ?) and network (4-layer fully connected feed-forward network) were considered, there was a 98.92% word recognition accuracy and a 92.62% sentence recognition accuracy on a test set of the FIELD continuous digits recognition task.
High Performance Telephone Bandwidth Speaker Independent Continuous Digit Recognition.
Contributo in atti di convegno
IEEE, New York, USA
ASRU 2001 - Automatic Speech Recognition and Understanding Workshop, pp. 405–408, Madonna di Campiglio, Trento (Italy), December 9-13, 2001