Word and pattern recognition through overlapping hierarchical tree defined by relational features
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United States of America Patent
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Jul 28, 1998
Grant Date -
N/A
app pub date -
Jul 18, 1996
filing date -
Jul 19, 1995
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A voice recognizing method in which a plurality of voice recognition objective words are provided. Scores are accumulated for an unknown input voice signal as compared to the voice recognition objective words by using parameters which are calculated in advance. Upon receipt of an unknown voice signal, a corresponding voice recognition objective word is extracted and recognized. The voice recognition objective words are structured into an overlapping hierarchical structure by using correlation values between each pair of voice recognition objective words. This correlation may be computed from acoustic features, HMM parameters or the like. Score calculation is performed on the unknown input voice signal by using a dictionary of the voice recognition objective words structured in the hierarchical structure. Upon preliminary recognition, the dictionary of the voice recognition objective words is resorted without recalculation of the correlation values.
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