Sixth European Conference on Speech Communication and Technology
(EUROSPEECH'99)

Budapest, Hungary
September 5-9, 1999

Topic Detection in Broadcast News

Frederick Walls, Hubert Jin, Sreenivasa Sista, Richard Schwartz

BBN Technologies, Cambridge, MA, USA

We propose a system for the Topic Detection and Tracking (TDT) detection task concerned with the unsupervised grouping of news stories according to topic. We use an incremental k -means algorithm for clustering stories. For comparing stories, we utilize a probabilistic document similarity metric and a traditional vector-space metric. We note that that the clustering algorithm requires two different types of metrics and adapt similarity metrics for each purpose. The system achieves a topic-weighted miss rate of 12% at a false accept rate of 0.22%.


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Bibliographic reference.  Walls, Frederick / Jin, Hubert / Sista, Sreenivasa / Schwartz, Richard (1999): "Topic detection in broadcast news", In EUROSPEECH'99, 2451-2454.