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IEEE International Conference on Acoustics, Speech and Signal Processing

作者： Li, HongYan Liang, JiaEn Wang, ShiJin Xu, Bo Chinese Acad Sci Inst Automat Digital Content Technol Res Ctr Beijing 100190 Peoples R China

ISBN: (纸本)9781424423538

Mispronunciation detection is an important component in computer assisted language learning (CALL) system. In this work, we introduce an efficient GLDS-SVM based detection method, which is successfully used in language and speaker identification systems, and combine it with traditional methods. The main ideas include: extended MFCC features with normalized formant trajectory information, and then propose a novel multi-model strategy for model training to make full use of samples and solve the problem of data unbalance, finally combine GLDS-SVM method with UBM-GMM system to further improve the performance. Experiments show that GLDS-SVM is highly efficient than traditional RBF-SVM, and the fused system can achieve a significant relative improvement of 17.5% in EER reduction, compared with the baseline UBM-GMM system.

关键词： computer assisted language learning Mispronunciation Detection Support Vector Machine Generalized Linear Discriminant Sequence System Fusion

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Developing a Film-Based learning System with English Verbal Reduced Forms for Supporting English Listening Comprehension

Developing a Film-Based Learning System with English Verbal ...

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4rd International Conference on E-learning and Games (Edutainment 2009)

作者： Yang, Jie-Chi Lin, Yi-Lung Chung, Ching-I Natl Cent Univ Grad Inst Network Learning Technol Taipei Taiwan

ISBN: (纸本)9783642033636

English listening comprehension is always bewildering for language learners. English language students are generally not taught to recognize English in reduced forms (contractions) in verbal exchanges;they also lack opportunities for practicing listening exercises in reduced forms of English vocabulary. This study developed a film based vocal language learning system working with English reduced forms, thus enabling students to learn English in reduced forms. The film includes an abundance of learning situations, which are easily learned from. Within this system, the learner can import subtitles from English films by themselves. The system also automatically marks reduced English forms in verbal conversations, and offers many example sentences for listening exercises. The system uses subtitles as the source of examinations for students after completing course sections. The system can generate items from movie subtitles automatically, as well as evaluating learner performance. This study probes the effectiveness of the aforementioned learning system as well as the user's attitude and satisfaction with the system. The results show that the learning system of English reduced forms in verbal conversations had a positive effect on the experimental group's learning which was significantly better than traditional film systems without English reduced form subtitles used by the control group. Hence this system benefits students learning English contractions. In English listening tests, the results of experimental group were significantly higher than the control group. The results of post-course survey showed positive satisfaction by system users. All students using the system reported a positive attitude after using the system. The system can be improved by enhancing the interfaces which broadcast the films and subtitles as well as increasing the course and experimental time periods.

关键词： reduced forms contractions film based learning listening comprehension computer assisted language learning

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An Empirical Research on Interactive Self-Access Listening Teaching Model in MCALL Environment

An Empirical Research on Interactive Self-Access Listening T...

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2nd IEEE International Conference on computer Science and Information Technology

作者： Yang, Min Sun, Zhuo Song, Yunxia Jilin Univ Basic Courses Teaching Ctr Changchun 130062 Peoples R China

ISBN: (纸本)9781424445189

The rapid development of computer assisted language learning (CALL) has exerted a highly significant influence on college English teaching and learning. This paper intends to explore a brand new listening teaching model-Interactive Self-Access Listening (ISL) teaching model in MCALL (Multimedia CALL) environment and test its effectiveness in practical teaching implementation. After the quantitative data-collection and analysis, a conclusion is reached that most of the students show positive attitudes towards ISL and this model is effective to a large degree in the process of listening.

关键词： computer assisted language learning Listening Teaching Interactive learning Self-Access learning Learner-Centeredness Cooperative learning

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An Mandarin Pronunciation Quality Assessment System Using Two Kinds of Acoustic Models

An Mandarin Pronunciation Quality Assessment System Using Tw...

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International Conference on Research Challenges in computer Science

作者： Ge, Fengpei Lu, Li Liu, Changliang Pan, Fuping Dong, Bin Yan, Yonghong Chinese Acad Sci Inst Acoust ThinkIT Speech Lab Beijing Peoples R China

ISBN: (纸本)9780769539270

This paper presents our Mandarin pronunciation quality assessment system for the examination of Putonghua Shuiping Kaoshi (PSK) and investigates some measures to improve the assessment accuracy. In this paper, a selective speaker adaptation method is studied. In the adaptation module, we select well pronounced speech as the adaptation data, and adopt Maximum Likelihood Linear Regression (MLLR) to update the speaker-independent (SI) acoustic model. Besides the triphone based acoustic model, the monophone based acoustic model is also applied to our system. Further improvements are obtained by combining posterior probabilities computed with triphone and monophone based acoustic models using Support Vector Machine (SVM) to assess the goodness of pronunciations. The experiment results show that the average correlation coefficient (ACC) between machine and the human scores achieves 0.8549, almost equivalent to ACC between different experts. The improved system achieves usable performance in actual applications.

关键词： computer assisted language learning Pronunciation Quality Assessment Speaker Adaptation Support Vector Machine Speech Recognition

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An Empirical Research on Interactive Self-Access Listening Teaching Model in MCALL Environment

An Empirical Research on Interactive Self-Access Listening T...

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2009 2nd IEEE International Conference on computer Science and Information Technology(第二届计算机科学与信息技术国际会议 ICCSIT2009)

作者： Min Yang Zhuo Sun Yunxia Song Basic Courses Teaching Center Heping Campus Jilin University Changchun China 130062

关键词： computer assisted language learning Listening Teaching Interactive learning Self-Access learning Learner-Centeredness Cooperative learning

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Criteria for evaluating synchronous learning management systems: Arguments from the distance language classroom

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computer assisted language learning 2009年第1期22卷 1-18页

作者： Wang, Y. Chen, N.-S. School of Languages and Linguistics Griffith University Nathan Australia Department of Information Management National Sun Yat-sen University Kaohsiung Taiwan

As Virtual learning Environments (VLE) supported by synchronous technologies such as Synchronous learning Management Systems (SLMSs) are still new to distance language professionals, criteria guiding the evaluation of the appropriate SLMSs for Distance language Education (DLE) are urgently needed. This article proposes and discusses such criteria. To achieve this, we divide the article into four sections. The first section identifies the need to develop criteria for evaluating an appropriate SLMS for DLE by reviewing what has been achieved in the research into computer Mediated Communications (CMC) and SLMSs. The second section examines established principles of second language (L2) learning and the nature of distance language education in order to establish a theoretical framework for the formulation of such criteria. In section three, we propose five major criteria for evaluating an effective SLMS for DLE. We further discuss and argue for each criterion from the perspectives of both an e-instructor and an e-learner, and drawing on the empirical data from our distance language classroom. The final section acknowledges the limitations of the study and concludes that the proposal of these criteria is timely and that these criteria need to be enriched with the pedagogical and technological developments in DLE.

关键词： computer assisted language learning Cyber face-to-face interaction Distance language education Synchronous classroom Synchronous learning management systems

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Synthetic speech in foreign language learning: an evaluation by learners

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INTERNATIONAL JOURNAL OF SPEECH TECHNOLOGY 2008年第2期11卷 97-106页

作者： Kang, Min Kashiwagi, Harumi Treviranus, Jutta Kaburagi, Makoto Kobe Univ Grad Sch Intercultural Studies Human Commun & Informat Sci Div Kobe Hyogo 6578501 Japan Kobe Univ Sch Languages & Commun Kobe Hyogo 6578501 Japan Univ Toronto Fac Informat Studies Adapt Technol Resource Ctr Toronto ON M5S 1A5 Canada

Can synthetic speech be utilized in foreign language learning as natural speech? In this paper, we evaluated synthetic speech from the viewpoint of learners in order to find out an answer. The results pointed out that learners do not recognize remarkable differences between synthetic voices and natural voices for the words with short vowels and long vowels when they try to understand the meanings of the sounds. The data explicates that synthetic voice utterances of sentences are easier to understand and more acceptable by learners compared to synthetic voice utterances of words. In addition, the ratings on both synthetic voices and natural voices strongly depend upon the learners' listening comprehension abilities. We conclude that some synthetic speech with specific pronunciations of vowels may be suitable for listening materials and suggest that evaluating TTS systems by comparing synthetic speech with natural speech and building a lexical database of synthetic speech that closely approximates natural speech will be helpful for teachers to readily use many existing CALL tools.

关键词： computer assisted language learning Evaluation of synthetic speech Improving classroom teaching Media in education Teaching/learning strategies

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Word sense disambiguation for vocabulary learning

Word sense disambiguation for vocabulary learning

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9th International Conference on Intelligent Tutoring Systems

作者： Kulkarni, Anagha Heilman, Michael Eskenazi, Maxine Callan, Jamie Carnegie Mellon Univ Language Technol Inst Pittsburgh PA 15213 USA

ISBN: (纸本)9783540691303

Words with multiple meanings are a phenomenon inherent to any natural language. In this work, we study the effects of such lexical ambiguities on second language vocabulary learning. We demonstrate that machine learning algorithms for word sense disambiguation can induce classifiers that exhibit high accuracy at the task of disambiguating homonyms (words with multiple distinct meanings). Results from a user study that compared two versions of a vocabulary tutoring system, one that applied word sense disambiguation to support learning and another that did not, support rejection of the null hypothesis that learning outcomes with and without word sense disambiguation are equivalent, with a p-value of 0.001. To our knowledge this is the first work that investigates the efficacy of word sense disambiguation for facilitating second language vocabulary learning.

关键词： vocabulary learning word sense disambiguation English as a second language computer assisted language learning

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Mandarin vowel pronunciation quality evaluation by a novel formant classification method and its combination with traditional algorithms

Mandarin vowel pronunciation quality evaluation by a novel f...

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33rd IEEE International Conference on Acoustics, Speech and Signal Processing

作者： Pan, Fuping Zhao, Qingwei Yan, Yonghong Chinese Acad Sci Inst Acoust ThinkIT Lab Beijing Peoples R China

ISBN: (纸本)9781424414833

This paper discusses the vowel pronunciation quality assessment of our computer assisted Mandarin Chinese learning system. Under the speech recognition framework, phonetic pronunciation assessment is usually based on the phonetic posterior probability score, which may be computed by normalizing the frame-based posterior probability or be calculated on the phone segment directly. By the first method, we can achieve a human-machine scoring correlation coefficient (CC) of 0.832 for vowel;and by the second, the CC can be up to 0.847. In order to improve the performance, we suggest employing the formant feature of vowel. This paper proposes a novel method to utilize formant: we plot formant candidates of each frame on the time-frequency plane to form a bitmap, and then extract its Gabor feature for pattern classification. When we use the classification probability score for pronunciation assessment, we get a CC of 0.842. Finally we combine the three scores with various linear or nonlinear methods;the best CC of 0.913 is gotten by using neural network.

关键词： computer assisted language learning speech recognition formant Gabor feature neural network

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EFFECTIVENESS OF A BLENDED learning MODEL FOR ENGLISH AS A FOREIGN language (EFL) TEACHING: AN EMPIRICAL STUDY

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RLA-REVISTA DE LINGUISTICA TEORICA Y APLICADA 2008年第2期46卷 95-118页

作者： Morales Rios, Sandra Ferreira Cabrera, Anita Univ Concepcion Concepcion Chile

The purpose of this paper is to provide researchers and practitioners with valid guidelines for the development of CALL materials for foreign language learning. Our primary goal is to portray how theoretical principles from different language teaching approaches (such as Task Based language Teaching and Cooperative learning) can be put into practice efficiently in the design of activities for online (e-learning) and mixed (b-learning) environments. Bearing this in mind, we examine empirical evidence in order to determine the efficiency of Blended learning vs. face-to-face instruction for English as a Foreign language Teaching. Both methods were contrasted and tested in an experimental prepost-test control group research design. Findings suggest that the experimental group, which employed a Blended learning model, had a considerable language improvement compared to the control group that used a traditional face-to-face method. Considering the results, we strongly recommend researchers and practitioners to include Blended learning models into the design of CALL materials.

关键词： Blended learning E-learning computer assisted language learning Task Based language Teaching (TBLT) Cooperative Approach ICT

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