Method and apparatus for reducing false rejection in a...

Details Method and apparatus for reducing false rejection in a... Method and apparatus for reducing false rejection in a...

G - Physics

10

L

G10L 15/18 (2006.01) G10L 15/06 (2006.01)

Patent

CA 2191392

The invention relates to a method and apparatus for grouping orthographies in a speech recognition dictionary to reduce false rejection. In a typical speech recognition system, the process of speech recognition consists of scanning the vocabulary database by using a fastmatch algorithm to find the top N orthography groups. In a second pass the orthographies in the selected groups are re-scored using more precise likelihoods. The top orthographies in the top two groups are then processed by a rejection algorithm to find if they are sufficiently distinct from one another. In the affirmative the top choice candidate is accepted, otherwise the entire procedure is terminated. The novel method comprises the steps of grouping confusable orthographies together to reduce the possibility of false rejection.

Méthode et appareil de groupement d'éléments orthographiques dans un dictionnaire de reconnaissance de la parole, afin de réduire les refus erronés. Dans un système type, le processus de reconnaissance de la parole consiste à balayer la base de données de vocabulaire en utilisant un algorithme d'appariement rapide, afin de trouver les principaux groupes orthographiques. Durant un second passage, les éléments orthographiques des groupes choisis sont re-notés à l'aide de vraisemblances plus précises. Les principaux éléments orthographiques des deux groupes principaux sont alors traités au moyen d'un algorithme de refus, afin de déterminer s'ils sont suffisamment distincts l'un de l'autre. Dans l'affirmative, le candidat de premier choix est accepté, sinon le processus dans son entier est terminé. La nouvelle méthode comprend les étapes de groupement d'éléments orthographiques pouvant créer une confusion, afin de réduire la possibilité de refus erronés.

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