Method of key-phase detection and verification for flexible speech understanding
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United States of America Patent
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Aug 18, 1998
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app pub date -
Dec 20, 1996
filing date -
Oct 1, 1996
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Abstract
A key-phrase detection and verification method that can be advantageously used to realize understanding of flexible (i.e., unconstrained) speech. A 'multiple pass' procedure is applied to a spoken utterance comprising a sequence of words (i.e., a 'sentence'). First, a plurality of key-phrases are detected (i.e., recognized) based on a set of phrase sub-grammars which may, for example, be specific to the state of the dialogue. These key-phrases are then verified by assigning confidence measures thereto and comparing these confidence measures to a threshold, resulting in a set of verified key-phrase candidates. Next, the verified key-phrase candidates are connected into sentence hypotheses based upon the confidence measures and predetermined (e.g., task-specific) semantic information. And, finally, one or more of these sentence hypotheses are verified to produce a verified sentence hypothesis and, from that, a resultant understanding of the spoken utterance.
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