Method and system for automatic text-independent grading of pronunciation for language instruction
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United States of America Patent
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May 1, 2001
Grant Date -
N/A
app pub date -
Jan 26, 2000
filing date -
Oct 2, 1996
priority date (Note) -
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status (Latency Note)
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Abstract
Pronunciation quality is automatically evaluated for an utterance of speech based on one or more pronunciation scores. One type of pronunciation score is based on duration of acoustic units. Examples of acoustic units include phones and syllables. Another type of pronunciation score is based on a posterior probability that a piece of input speech corresponds to a certain model such as an HMM, given the piece of input speech. Speech may be segmented into phones and syllables for evaluation with respect to the models. The utterance of speech may be an arbitrary utterance made up of a sequence of words which had not been encountered before. Pronunciation scores are converted into grades as would be assigned by human graders. Pronunciation quality may be evaluated in a client-server language instruction environment.
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