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Speech recognition and teaching apparatus able to rapidly adapt to difficult speech of children and foreign speakers

  • US 6,253,181 B1
  • Filed: 01/22/1999
  • Issued: 06/26/2001
  • Est. Priority Date: 01/22/1999
  • Status: Expired due to Term
First Claim
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1. A speech recognition apparatus that adapts an initial speech model based on input speech from the user, comprising:

  • a speech model that represents speech as a plurality of speech unit models associated with a plurality of speech units;

    a speech recognizer that processes input speech from a user using said speech model to recognize uttered speech units within said input speech;

    a confidence measurement system associated with said speech recognizer for associating a confidence measure with each of said uttered speech units;

    an adaptation system having data store containing information reflecting a priori knowledge about a speaker space, said adaptation system being operative to select uttered speech units that exceed a predetermined confidence measure and to use said selected uttered speech units and said information reflecting a priori knowledge to adapt said speech model; and

    wherein said adaptation system includes a data store containing a set of eigenspace basis vectors representing a plurality of training speakers and wherein said adaptation system uses said selected uttered speech units to train an adapted speech model while using said basis vectors to constrain said adapted speech model such that said adapted speech model lies within said eigenspace.

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