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This paper presents recent w ork on a m ultimedia retrieval project at Cambridge University and Olivetti Research Limited ORL. We present novel techniques that allow extremely rapid audio indexing, at rates approaching several thousand times real time. Unlike other methods, these techniques do not depend on a xed vocabulary recognition system or on keywords that must be known well in advance. Using statistical methods developed for text, these indexing techniques allow rapid and e cientdoi:10.1145/244130.244232 dblp:conf/mm/BrownFJJY96 fatcat:jscqtoqimfd3nmmsxjtcd5pqwa