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Speech recognition method and apparatus using lexicon group tree

  • US 7,953,594 B2
  • Filed: 01/31/2006
  • Issued: 05/31/2011
  • Est. Priority Date: 02/02/2005
  • Status: Expired due to Fees
First Claim
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1. A method of generating a lexicon group tree, comprising the steps of:

  • (a) generating, using at least one processor, a centroid lexicon representing lexicons belonging to a predetermined lexicon group;

    (b) selecting two lexicons, having a longest distance therebetween in the lexicon group, using the centroid lexicon from the lexicon group, and branching a node indicating the lexicon group, based on the two selected lexicons; and

    (c) selecting a node having low group similarity from among current terminal nodes, including branch nodes, and repeatedly performing steps (a) and (b) on a lexicon group indicated by the selected node,wherein the steps (a) and (b) are repeatedly performed until a variance, indicating group similarity, becomes lower than a predetermined threshold value and/or until the number of lexicons, belonging to a node, decreases to a predetermined number or less, andwherein the step (b) comprises the steps of;

    (b1) selecting a first lexicon having a longest distance to the centroid lexicon from the lexicon group;

    (b2) selecting a second lexicon having a longest distance to the first lexicon from the lexicon group; and

    (b3) bisecting remaining lexicons belonging to the lexicon group, based on the two selected lexicons.

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