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Acoustic model creating method, acoustic model creating apparatus, acoustic model creating program, and speech recognition apparatus

  • US 20050131694A1
  • Filed: 11/29/2004
  • Published: 06/16/2005
  • Est. Priority Date: 12/12/2003
  • Status: Abandoned Application
First Claim
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1. An acoustic model creating method of optimizing Gaussian distribution numbers for respective states constituting an HMM (hidden Markov Model) for each state, and thereby creating an HMM having optimized Gaussian distribution numbers, the acoustic model creating method comprising:

  • incrementing a Gaussian distribution number step by step according to a specific increment rule for each state in plural HMM'"'"'s, and setting each state to a specific Gaussian distribution number;

    creating matching data by matching each state in respective HMM'"'"'s, which has been set to the specific Gaussian distribution number in the distribution number setting, to training speech data;

    finding, according to a Minimum Description Length criterion, a description length of each state in respective HMM'"'"'s having a Gaussian distribution number at a present time to be outputted as a present time description length, and finding, according to the Minimum Description Length criterion, a description length of each state in respective HMM'"'"'s having a Gaussian distribution number immediately preceding the present time to be outputted as an immediately preceding description length, with use of the matching data created in the matching data creating; and

    comparing the present time description length with the immediately preceding description length in size, both of which are calculated in the description length calculating, and setting an optimum Gaussian distribution number for each state in respective HMM'"'"'s on a basis of a comparison result.

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