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Carnegie Mellon's Harpy System
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=== Hearsay-I System === *'''The Hearsay-I System''' must use all these sources of knowledge effectively in the Hearsay System, this is achieved by representing knowledge as as a set of '''cooperating parallel process'''. The Hearsay System also use the source of knowledge ('''acoustics-phonetics, prosody, lexicon, syntax, semantics and pragmatics''') to '''generate hypothesis''' about what words might appear. The Hearsay System is incrementally trying to match words to the un-analyzed portion of the utterance *If the resulting word matches are not optimal, the system '''backs up and tries a different path'''. The technique was known as probabilistic tree. The Hearsay System '''cannot''' recognize sentences in unrestricted English and can only recognize simple phrase structure languages. *To be acceptable as an input medium, the system must not only perform with high accuracy, but it must also minimize the combinatorial explosion so as to respond as fast as a human would in a similar situation.
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