Method, apparatus, and medium for measuring confidence about speech recognition in speech recognizer
First Claim
1. A method of measuring confidence of speech recognition in a speech recognizer, the method comprising:
- detecting a phase change point of a speech signal;
detecting a phoneme string change point according to a result of speech recognition of the speech signal; and
calculating confidence of the speech recognition by using a difference between the detected phase change point and the detected phoneme string change point, and a likelihood ratio.
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Abstract
A method of measuring confidence of speech recognition in a speech recognizer compares a phase change point with a phoneme string change point and uses a difference between the phase change point and the phoneme string change point and a likelihood ratio, and an apparatus using the method is provided. That is, the method of the present invention includes detecting a phase change point of a speech signal; detecting a phoneme string change point according to a result of speech recognition; calculating confidence of the speech recognition by using a difference between the detected phase change point and phoneme string change point. According to the present invention, a performance of measuring confidence may become improved by simultaneously taking not only a likelihood ratio, but also taking a comparison result of a phase change point with a phoneme string change point into consideration.
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Citations
22 Claims
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1. A method of measuring confidence of speech recognition in a speech recognizer, the method comprising:
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detecting a phase change point of a speech signal; detecting a phoneme string change point according to a result of speech recognition of the speech signal; and calculating confidence of the speech recognition by using a difference between the detected phase change point and the detected phoneme string change point, and a likelihood ratio. - View Dependent Claims (2, 3, 4, 5, 6, 11)
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7. A method of measuring confidence of speech recognition of a speech recognizer, the method comprising:
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extracting a feature of a speech signal; calculating a spectrogram of the speech signal; recognizing a speech from the extracted feature of the speech signal by using a predetermined speech recognition model; comparing a phase change of the speech signal by using a result of speech recognition and the calculated spectrogram; calculating a likelihood ratio of the speech recognition according to the speech recognition model; and calculating confidence of the speech recognition by considering the phase change comparison and the likelihood ratio. - View Dependent Claims (8, 9, 10, 20)
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12. A measuring apparatus for confidence of speech recognition in a speech recognizer, the apparatus comprising:
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a phase change detection unit detecting a phase change point of a speech signal; a phoneme string change detection unit detecting a phoneme string change point according to a result of speech recognition in the speech recognizer; and a confidence calculation unit calculating confidence of the speech recognition by using a comparison result a detected phase change point with the detected phoneme string change point, and a likelihood ratio. - View Dependent Claims (13, 14, 15)
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16. A measuring apparatus of confidence of speech recognition in a speech recognizer, the apparatus comprising:
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a feature extraction unit extracting a feature of a speech signal; a spectrogram calculation unit calculating a spectrogram of the speech signal; a speech recognition unit recognizing a speech from a feature of the extracted speech signal by using a predetermined speech recognition model; a phase change comparison unit comparing phase changes of a speech signal by using a result of speech recognition and the calculated spectrogram; a likelihood ratio calculation unit calculating a likelihood ratio of the speech recognition according to the result of speech recognition; and a confidence measuring unit calculating confidence of the speech recognition by considering both the comparison result of the phase change and the likelihood ratio. - View Dependent Claims (17, 18, 19)
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- 21. A method of measuring confidence of speech recognition of a speech signal comprising calculating confidence of the speech recognition by using a difference between a phase change point of the speech signal and a phoneme string change point, and by using a likelihood ratio of the speech signal.
Specification