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• W2893256965 abstract "Query-by-example spoken document retrieval (QbESDR) aims at finding those documents in a set that include a given spoken query. Current approaches are, in general, not valid for real-world applications, since they are mostly focused on being effective (i.e. reliably detecting in which documents the query is present) but practical implementations must also be efficient (i.e. the search must be performed in a limited time) in order to allow for a satisfactory user experience. In addition, systems usually search for exact matches of the query, which limits the number of relevant documents retrieved by the search. This paper proposes a representation of the documents and queries for QbESDR based on combining different-sized phone n-grams obtained from automatic transcriptions, namely phone multigram representation. Since phone transcriptions usually have errors, several hypotheses for the query transcriptions are combined in order to ease the impact of these errors. The proposed system stores the document in inverted indices, which leads to fast and efficient search. Different combinations of the phone multigram strategy with a state-of-art system based on pattern matching using dynamic time warping (DTW) are proposed: one consists in a two-stage system that intends to be as effective but more efficient than a DTW-based system, while the other aims at improving the performance achieved by these two systems by combining their output scores. Experiments performed on the MediaEval 2014 Query-by-Example Search on Speech (QUESST 2014) evaluation framework suggest that the phone multigram representation for QbESDR is a successful approach, and the assessed combinations with a DTW-based strategy lead to more efficient and effective QbESDR systems. In addition, the phone multigram approach succeeded in increasing the detection of non-exact matches of the queries." @default.
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• W2893256965 date "2019-01-01" @default.
• W2893256965 modified "2023-09-23" @default.
• W2893256965 title "Efficient query-by-example spoken document retrieval combining phone multigram representation and dynamic time warping" @default.
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• W2893256965 doi "https://doi.org/10.1016/j.ipm.2018.09.002" @default.
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