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Method and apparatus for speech recognition adapted to an individual speaker

  • US 5,864,810 A
  • Filed: 01/20/1995
  • Issued: 01/26/1999
  • Est. Priority Date: 01/20/1995
  • Status: Expired due to Term
First Claim
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1. A speaker adaptive speech recognition system comprising:

  • means for receiving a speech signal from a speaker;

    feature extraction means for converting said speech signal into a data set of feature vectors;

    means for storing a plurality of speaker independent models, said models initially having undetermined parameters;

    a training engine for determining the parameters of said speaker independent models from a set of training data;

    an adaptation engine capable of receiving speech data from a particular speaker and using said data from a particular speaker to determine the parameters of a plurality of transformations for transforming the parameters of said speaker independent models independently of a set of trained speaker dependent models said parameters once determined used to adapt a plurality of speaker independent models such that at least one speaker independent model may be adapted even where there is no speaker dependent data available for said at least one model using maximum likelihood techniques and generating a set of speaker adapted models; and

    a recognition engine capable of using said speaker independent models and said speaker adapted models to recognize words from a set of unidentified feature vectors.

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