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Apparatus and Method for Speech Recognition

  • US 20080201136A1
  • Filed: 09/18/2007
  • Published: 08/21/2008
  • Est. Priority Date: 02/19/2007
  • Status: Active Grant
First Claim
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1. A speech recognition apparatus comprising:

  • a first storing unit configured to store a first acoustic model invariable regardless of speaker and environment;

    a second storing unit configured to store second acoustic models that vary in accordance with at least either one of a specific speaker and a specific environment;

    a third storing unit configured to store a classification model that has shared parameters with the first acoustic model and non-shared parameters with the first acoustic model to classify the second acoustic models into different groups;

    a first recognizing unit configured to calculate a first likelihood with regard to the input speech by applying the first acoustic model to the input speech and obtain calculation result on the shared parameter and a plurality of candidate words that have relatively large values as the first likelihood;

    a calculating unit configured to calculate a second likelihood for each of the groups with regard to the input speech by use of the calculation result on the shared parameters and the non-shared parameters of the classification model;

    a selecting unit configured to select a group that has a largest value for the second likelihood from among the groups; and

    a second recognizing unit configured to recognize the input speech by applying a second acoustic model that belongs to the selected group onto the input speech to calculate a third likelihood for each of the candidate words and obtain as the recognition result a candidate word that has a largest value as the third likelihood.

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