Effective Prediction of Errors by Non-native Speakers Using Decision Tree for Speech Recognition-Based CALL System

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概要

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• CALL (Computer Assisted Language Learning) systems using ASR (Automatic Speech Recognition) for second language learning have received increasing interest recently. However, it still remains a challenge to achieve high speech recognition performance, including accurate detection of erroneous utterances by non-native speakers. Conventionally, possible error patterns, based on linguistic knowledge, are added to the lexicon and language model, or the ASR grammar network. However, this approach easily falls in the trade-off of coverage of errors and the increase of perplexity. To solve the problem, we propose a method based on a decision tree to learn effective prediction of errors made by non-native speakers. An experimental evaluation with a number of foreign students learning Japanese shows that the proposed method can effectively generate an ASR grammar network, given a target sentence, to achieve both better coverage of errors and smaller perplexity, resulting in significant improvement in ASR accuracy.

• （社）電子情報通信学会の論文
• 2009-12-01

著者

• Kawahara Tatsuya

  Graduate School Of Informatics Kyoto University

• WANG Hongcui

  Graduate School of Informatics, Kyoto University

• Wang Hongcui

  Graduate School Of Informatics Kyoto University

関連論文

• Modeling and automatic detection of English sentence stress for computer-assisted English prosody learning system
• Formant structure estimation using vocal tract length normalization for CALL systems
• Lecture Speech Recognition Using Large Corpus of Spontaneous Japanese
• Effective Prediction of Errors by Non-native Speakers Using Decision Tree for Speech Recognition-Based CALL System
• Bayesian Learning of a Language Model from Continuous Speech
• Joint Phrase Alignment and Extraction for Statistical Machine Translation
• Joint Phrase Alignment and Extraction for Statistical Machine Translation

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