4th International Conference on Spoken Language Processing

Philadelphia, PA, USA
October 3-6, 1996

Initial Evaluation of a Preselection Module for a Flexible Large Vocabulary Speech Recognition System in Telephone Environment

J. Macias-Guarasa (1), A. Gallardo (1), J. Ferreiros (1), José M. Pardo (1), L. Villarrubia (2)

(1) Grupo de Tecnología del Habla, Dept. de Ingeniería Electrónica, Universidad Politécnica de Madrid
(2) Grupo de Tecnología del Habla, Telefónica Investigación y Desarrollo, Spain
(2) Grupo de Tecnología del Habla, Telefónica Investigación y Desarrollo, Spain

We are improving a flexible, large vocabulary, speaker independent, isolated-word recognition system in a telephone environment, originally designed as an integrated system doing all the recognition process in one step. We have transformed it, by adopting the hypothesis-verification paradigm. In this paper, we will describe the architecture and results of the hypothesis subsystem. We will show the system evolution and the modifications adopted to face such a difficult task, achieving significant improvements using automatically clustered phoneme-like units, semi-continuous HMMs, and multiple models per unit. Also, system behavior for vocabulary dependent and independent tasks and vocabularies up to 10000 words will be tested.

Full Paper

Bibliographic reference.  Macias-Guarasa, J. / Gallardo, A. / Ferreiros, J. / Pardo, José M. / Villarrubia, L. (1996): "Initial evaluation of a preselection module for a flexible large vocabulary speech recognition system in", In ICSLP-1996, 30-33.