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An Effective CALL System for Strongly Accented Mandarin Speech
Jiang Tonghai; Tang Ming; Ge Fengpei; Liu Changliang; Dong Bin
2009
会议名称International Conference on Research Challenges in Computer Science
会议录名称ICRCCS 2009 - 2009 International Conference on Research Challenges in Computer Science
页码92-95
会议日期DEC 28-29, 2009
会议地点Shanghai, PEOPLES R CHINA
出版地10662 LOS VAQUEROS CIRCLE, PO BOX 3014, LOS ALAMITOS, CA 90720-1264 USA
出版者2009 INTERNATIONAL CONFERENCE ON RESEARCH CHALLENGES IN COMPUTER SCIENCE, ICRCCS 2009
摘要

In this paper, we investigate some specific acoustic problems of the computer assisted language learning (CALL) system by modifying the acoustic model and feature under the speech recognition framework. At first, in order to alleviate the distortion of channel and speaker, speaker-dependent Cepstrum Mean Normalization (Speaker CMN) is adopted, by which the average correlation coefficient (ACC) between human and machine scores is improved from 78.00% to 84.14%. Then, Heteroscedastic Linear Discriminate Analysis (HLDA) is applied to enhance the discrimination ability of acoustic model, which successfully increases ACC from 84.14% to 84.62%. Additionally, HLDA can lessen the great human-machine scoring difference of speeches that have very good or too bad quality, and so leads to an increase of the correctly-rank rate from 85.59% to 90.99%. Finally, we use the technology of Maximum a Posteriori (MAP) to tune the acoustic model to match the strongly accented testing speech. As the result, ACC is improved from 84.62% to 86.57%.

关键词Computer Assisted Language Learning Pronunciation Quality Assessment Hlda Speaker Cmn Map
主办者Int Comp Sci Soc, Intelligent Informat Technol Appl Res Assoc, Wuhan Univ Sci & Technol, S China Normal Univ
文献类型会议论文
条目标识符http://ir.xjipc.cas.cn/handle/365002/2326
专题多语种信息技术研究室
作者单位Chinese Acad Sci, Xinjiang Tech Inst Phys & Chem, Urumqi, Peoples R China;Xinjiang Publ Secur Dept, Urumqi, Peoples R China;Chinese Acad Sci, Inst Acoust, ThinkIT Speech Lab, Beijing, Peoples R China
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Jiang Tonghai,Tang Ming,Ge Fengpei,et al. An Effective CALL System for Strongly Accented Mandarin Speech[C]. 10662 LOS VAQUEROS CIRCLE, PO BOX 3014, LOS ALAMITOS, CA 90720-1264 USA:2009 INTERNATIONAL CONFERENCE ON RESEARCH CHALLENGES IN COMPUTER SCIENCE, ICRCCS 2009,2009:92-95.
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