Sixth International Conference on Spoken Language Processing
(ICSLP 2000)

Beijing, China
October 16-20, 2000

Spanish Recogniser of Continuously Spelled Names over the Telephone

Ruben San-Segundo, José Colás, Javier Ferreiros, Javier Macías-Guarasa, Juan Miguel Pardo

Grupo de Tecnología del Habla, Departamento de Ingeniería Electrónica, UPM, E.T.S.I. Telecomunicación, Madrid, Spain ABSTRACT In the paper, we present an analysis of the spelling task for Spanish and we describe the research and implementation of a Spanish recogniser for continuously spelled names over the telephone. We analyse and compare three different recognition architectures. The first one is a Two level architecture. This approach consists in two steps. In the first one we obtain the most likely letter sequence using the one-pass algorithm. In the second step, to obtain the name recognised, we align the sequence of letters with the different dictionary names using a Dynamic Programming (DP) algorithm. The second alternative consists on an Integrated Architecture where a constrained grammar is built with all the names from the dictionary. In this case, we have a higher Name Recognition Rate but the time processing increases a lot. Finally, we propose a combined architecture with a good compromise between recognition rate and time consuming. This approach responds to a strategy of Hypothesis and Verification. In the hypothesis stage, we obtain the most likely letter sequence (one-pass algorithm) and then we select N-candidates from the dictionary with a dynamic programming algorithm. In the verification stage, we build a dynamic grammar with the N-candidates and we recognise over it. With this system we obtain a 96.1% Name Recognition Rate in real time for the 1,000 names dictionary and, 92.3% and 89.6% for 5,000 and 10,000 names directories respectively.

Full Paper

Bibliographic reference.  San-Segundo, Ruben / Colás, José / Ferreiros, Javier / Macías-Guarasa, Javier / Pardo, Juan Miguel (2000): "Spanish recogniser of continuously spelled names over the telephone", In ICSLP-2000, vol.2, 863-866.