ATVS-CSLT-HCTLab System for NIST 2013 Open Keyword Search Evaluation

  • Javier Tejedor
  • Doroteo T. Toledano
  • Dong Wang
Conference paper
Part of the Lecture Notes in Computer Science book series (LNCS, volume 8854)


This paper presents the ATVS-CSLT-HCTLab spoken term detection (STD) system submitted to the NIST 2013 Open Keyword Search evaluation. The evaluation consists of searching a list of query terms in Vietnamese conversational speech data. Our submission involves an automatic speech recognition (ASR) subsystem which converts speech signals into word/phone lattices, and an STD subsystem which indexes and searches for query terms. The submission is a hybrid approach which employs a word-based system to search for in-vocabulary (INV) terms and a phone-based system to search for out-of-vocabulary (OOV) terms. A term-dependent discriminative confidence estimation is employed to score confidence of detections. Although the ASR performance is not state-of-the-art, our submission achieves a moderate STD performance in the evaluation.


spoken term detection evaluation N-gram reverse indexing term-dependent discriminative confidence 


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Copyright information

© Springer International Publishing Switzerland 2014

Authors and Affiliations

  • Javier Tejedor
    • 1
  • Doroteo T. Toledano
    • 2
  • Dong Wang
    • 3
  1. 1.GEINTRAUniversity of AlcaláSpain
  2. 2.ATVS-Biometric Recognition GroupUniversidad Autónoma de MadridSpain
  3. 3.Center for Speech and Language Technologies (CSLT)Tsinghua UniversityChina

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