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Method and system for assessing pronunciation difficulties of non-native speakers

  • US 8,478,597 B2
  • Filed: 01/10/2006
  • Issued: 07/02/2013
  • Est. Priority Date: 01/11/2005
  • Status: Active Grant
First Claim
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1. A computer-implemented method of assessing pronunciation difficulties of a non-native speaker, the method comprising:

  • determining a plurality of different types of phonetic sources of pronunciation difficulties between a language of a non-native speaker and a second language, said determining including determining multiple types of sounds in the second language that cause pronunciation difficulties;

    assigning a weight to each phonetic source of pronunciation difficulty, the weight representing a measure of severity of the source of pronunciation difficulty;

    calculating using a processor a phonetic difficulty score, wherein calculating the phonetic difficulty score comprises calculating a product of a number of times the phonetic source occurs in an utterance of the non-native speaker and the weight of the phonetic source;

    calculating using the processor a language model score based on a sound comparison between the language of the non-native speaker and the second language, wherein the language model score is calculated based on a difference between a cross-entropy of the utterance with respect to a language model of the language of the non-native speaker and a cross-entropy of the utterance with respect to a language model of the second language;

    normalizing using the processor the phonetic difficulty score and the language model score; and

    calculating and outputting a metric from the normalized phonetic difficulty score and the normalized language model score, the metric providing an assessment of pronunciation difficulty.

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