Title:
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Out-of-vocabulary word modelling and rejection for keyword spotting
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Author:
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Lleida Solano, Eduardo; Mariño, José B.; Salavedra Molí, Josep; Bonafonte Cávez, Antonio; Monte Moreno, Enrique
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Other authors:
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Universitat Politècnica de Catalunya. Departament de Teoria del Senyal i Comunicacions; Universitat Politècnica de Catalunya. VEU - Grup de Tractament de la Parla |
Abstract:
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This paper presents a combination of out-of-vocabulary
(OOV) word modeling and rejection techniques in an attempt to accept
utterances embedding a keyword and reject utterances with nonkeywords.
The goal of this research is to develop a robust, task-independent
Spanish keyword spotter and to develop a method for optimizing
confidence thresholds for a particular context. To model OOV words,
we employed both word and sub-word units as fillers, combined with
n-gram language models. We also introduce a methodology for optimizing
confidence thresholds to control the tradeoffs between acceptance,
confirmation, and rejection of utterances. Our experiments are based on
a Mexican Spanish auto-attendant system using the SpeechWorks recognizer
release 6.5 Second Edition, in which we achieved a reduction
in error of 8.9% as compared to the baseline system. Most of the error
reduction is attributed to better keyword detection in utterances that
contain both keywords and OOV words. |
Abstract:
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Peer Reviewed |
Subject(s):
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-Àrees temàtiques de la UPC::Enginyeria de la telecomunicació -Telecommunication -Telecomunicació |
Rights:
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Attribution-NonCommercial-NoDerivs 3.0 Spain
http://creativecommons.org/licenses/by-nc-nd/3.0/es/ |
Document type:
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Article - Published version Conference Object |
Published by:
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International Speech Communication Association (ISCA)
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