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Proc. of ICASSP09

dc.contributor.authorWang, Dong
dc.contributor.authorTejedor, Javier
dc.contributor.authorFrankel, Joe
dc.contributor.authorKing, Simon
dc.date.accessioned2010-10-12T13:05:23Z
dc.date.available2010-10-12T13:05:23Z
dc.date.issued2009en
dc.identifier.urihttp://hdl.handle.net/1842/3910
dc.description.abstractConfidence measures play a key role in spoken term detection (STD) tasks. The confidence measure expresses the posterior probability of the search term appearing in the detection period, given the speech. Traditional approaches are based on the acoustic and language model scores for candidate detections found using automatic speech recognition, with Bayes' rule being used to compute the desired posterior probability. In this paper, we present a novel direct posterior-based confidence measure which, instead of resorting to the Bayesian formula, calculates posterior probabilities from a multi-layer perceptron (MLP) directly. Compared with traditional Bayesian-based methods, the direct-posterior approach is conceptually and mathematically simpler. Moreover, the MLP-based model does not require assumptions to be made about the acoustic features such as their statistical distribution and the independence of static and dynamic co-efficients. Our experimental results in both English and Spanish demonstrate that the proposed direct posterior-based confidence improves STD performance.en
dc.titlePosterior-based confidence measures for spoken term detectionen
dc.typeConference Paperen
rps.titleProc. of ICASSP09en
dc.date.updated2010-10-12T13:05:24Z
dc.date.openingDate2009


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