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The application of speech recognition to live subtitling of Broadcast News has motivated the adaptation of the lexical and language models of the recognizer on a daily basis with text material retrieved from online newspapers. This paper studies the impact of this adaptation on two of the blocks following the speech recognition module: capitalization and topic indexation. We describe and evaluate...
We present a system to index and search conversational speech using a scoring heuristic on the expected posterior counts of phone n-grams in recognition lattices. We report significant improvements in retrieval effectiveness on five human languages over a strong 1-best baseline. The method is shown to improve the utility (mean average precision) of the retrieved lattices' rank order and to do so with...
Unlike the written documents, the spoken documents are difficult to be shown on the screen and browsed by the user during retrieval. In this paper, we propose to use multi-modal dialogues to help the user to "navigate" across the spoken document archives and retrieve the desired documents based on a topic hierarchy constructed by the key terms extracted from the retrieved spoken documents...
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