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Augmented set of features for confidence estimation in spoken term detection

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  • Javier Tejedor
  • Doroteo T. Toledano
  • Miguel Bautista
  • Simon King
  • Dong Wang
  • Jose Colas

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    Rights statement: Tejedor, J., Toledano, D. T., Bautista, M., King, S., Wang, D., & Colas, J. (2010). Augmented set of features for confidence estimation in spoken term detection. In Proc. Interspeech 2010.

    Accepted author manuscript, 209 KB, PDF-document

http://hdl.handle.net/1842/4539
Original languageEnglish
Title of host publicationProc. Interspeech 2010
Publication statusPublished - 2010

Abstract

Discriminative confidence estimation along with confidence normalisation have been shown to construct robust decision maker modules in spoken term detection (STD) systems. Discriminative confidence estimation, making use of termdependent features, has been shown to improve the widely used lattice-based confidence estimation in STD. In this work, we augment the set of these term-dependent features and show a significant improvement in the STD performance both in terms of ATWV and DET curves in experiments conducted on a Spanish geographical corpus. This work also proposes a multiple linear regression analysis to carry out the feature selection. Next, the most informative features derived from it are used within the discriminative confidence on the STD system.

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