Abstract
Phoneme posteriorgrams are widely used for speech representation when performing query-by-example search on speech. These posteriorgrams are computed by obtaining the per-frame a posteriori probability of each unit in a phoneme recogniser, regardless the architecture of this phoneme recogniser. It is straightforward to believe that the higher the quality of the phone transcriptions generated by a phoneme recogniser, the higher the quality of its resulting phoneme posteriorgrams; however, to the best of our knowledge, no analysis exist proving this statement. This paper aims at investigating whether there is a correlation between the phone error rate of a recogniser and the maximum term weighted value obtained when performing query-by-example search on speech. Experiments on the Albayzin corpus in Spanish language showed a slight correlation between these two metrics, which suggests that the goodness of phoneme posteriorgram representation is somehow related to phone error rate, but there are other factors that affect their performance in search on speech tasks.
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Notes
- 1.
The Spoken Term Detection (STD) 2006 Evaluation Plan, National Institute of Standards and Technology (NIST): http://www.itl.nist.gov/iad/mig/tests/std/2006/docs/std06-evalplan-v10.pdf.
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Acknowledgements
This research was funded by the Spanish Government under the project TEC2015-65345-P, the Galician Government through the research contract GRC2014/024 (Modalidade: Grupos de Referencia Competitiva 2014) and AtlantTIC Project CN2012/160, and by the European Regional Development Fund (ERDF).
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Lopez-Otero, P., Docio-Fernandez, L., Garcia-Mateo, C. (2016). Better Phoneme Recognisers Lead to Better Phoneme Posteriorgrams for Search on Speech? An Experimental Analysis. In: Abad, A., et al. Advances in Speech and Language Technologies for Iberian Languages. IberSPEECH 2016. Lecture Notes in Computer Science(), vol 10077. Springer, Cham. https://doi.org/10.1007/978-3-319-49169-1_13
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