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| 基于语音识别技术的英语发音评测系统研究 |
| The Research of English Pronunciation Evaluation System Based on the Speech Recognition Technology |
| 投稿时间：2015-08-13 |
| DOI：10.16018/j.cnki.cn32-1650/n.201601004 |
| 中文关键词: 语音识别 强制对位方式 语音段验证 置信度 评测机制 |
| 英文关键词: speech recognition Mandatory registration Speech segment validation Confidence Evaluation mechanism |
| 基金项目: |
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| 摘要点击次数: 3714 |
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| 中文摘要: |
| 利用语音识别技术，依英语发音的特有性，搭建完整合理的计算机辅助英语发音评测系统。整个系统包括3个部分:语音段验证、语音信号切割和发音评测。其中语音段验证利用置信度评估的技术，并依据置信度阀值对评测语音内容是否需要评测做出判断；语音信号切割是以预先训练好的英语发音声学模型为切割依据，通过强制对位的方式切割出正确的发音区段；英语发音评测是系统的核心，使用的评测方式是比较评测语音和标准语音的相似度，采用4个评测特征:发音完整度、韵律性、语速和准确度进行发音相似度评测。针对不同的特征参数设计合理的评测机制，并对4个特征参数进行加权运算，以建立一个完整合理的英语发音评测系统。实验证明，系统能够给出比较客观的评分，达到预期设计目标。 |
| 英文摘要: |
| using the speech recognition technology, according to the characteristic of English pronunciation, build a complete, reasonable evaluation system of computer aided English pronunciation. The whole system includes three parts: speech signal cutting, speech verification and pronunciation evaluation. The speech signal cutting based on prior training good English pronunciation as cutting based on acoustic model, through the way of mandatory registration section cut out the correct pronunciation. Speech segment validation using technology of confidence level evaluation, and on the basis of confidence threshold to judge evaluation speech content evaluation. English pronunciation evaluation is the core of the system, using the way of evaluation was to compare the similarity evaluation speech and standard speech. This paper uses four evaluation characteristics: pronunciation integrity, rhythm, speed and accuracy of the pronunciation similarity measure. According to the characteristics of the different parameters design and reasonable evaluation mechanism, and the four characteristic parameters are weighted arithmetic, to establish a complete and reasonable evaluation system of English pronunciation. Via experiment proves that the system can give more objective grading, achieved the desired design goal. |
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