日本語母語話者による英語音声の知覚と学習に与える音声圧縮の影響  [in Japanese] The Effect of Speech Compression on Second Language Speech Perception Learning  [in Japanese]

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Author(s)

    • 足立 隆弘 ADACHI Takahiro
    • ATR人間情報科学研究所:総合研究大学院大学文化科学研究科 ATR Human Information Science Lab.:Department of Cyber Society and Culture Course, The Graduate University for Advanced Studies (sokendai)
    • 山田 恒夫 YAMADA Tsuneo
    • メディア教育開発センター:総合研究大学院大学文化科学研究科 Media Kyouiku Kaihatu Senta (National Institute of Multimedia Education):Department of Cyber Society and Culture Course, The Graduate University for Advanced Studies (sokendai)

Abstract

外国語の聞き取りや発音の学習教材では,数多くの音声サンプルを学習者に呈示する.その際,さまざまな通信速度に適応したり,限られた容量に多くの音声サンプルを格納したりするために,音声を圧縮して使用する場合が多い.しかし,音声のききとりや発音の学習では,圧縮による音質低下が学習効果に影響を及ぼす可能性がある.本論文では,日本語母語話者にとって聞き取りが困難な英語音声を対象に,それらを圧縮することにより明瞭性がどのように変化するかを,現在一般に広く使用されている音声圧縮形式を対象として検討した.その結果,音韻の種類によって明瞭性が低下する圧縮形式が存在し,同音声形式の音声を用いて聞き取り訓練を行った場合,その訓練効果が圧縮前の原音声の聴取能力に般化しにくい場合があることが明らかとなった.この結果から,CALL教材で使用する音声は,明瞭性が高いものを使用することが望ましいことが示唆された.

In CALL, many authentic speech samples should be played to the learners when the material is aiming to improve listening and/or speaking abilities. In materials which deliver the content over the network, such as e-Learning system, speech files are often compressed in order to keep the transferring speed high or to save the memory space. However, there is a possibility that the trainig with compressed speech decreases the training effects compared to the training with uncompressed speech. In this paper, the effects of speech format on the intelligibility of English phoneme pairs, which are difficult for Japanese, were measured through perception experiments. Both native speakers of American English (AE) and native speakers of Japanese (J) identified English word pairs which contrasted in /r/-/l/, /b/-/v/ or /s/-/th/. Results demonstrated that the intelligibility of certain phonemes in certain formats decreased, both for native speakers of AE and native speaker of J.1t was also shown that when native speakers of J were trained to identify English phonemes by using speech with unsufficient intelligibility, the training effects did not generalize to the identification ability of high-quality speech. These results suggest that there are some speech formats which are inadequate for use in foreign language education materials.

Journal

  • Japan Journal of Educational Technology

    Japan Journal of Educational Technology 30(2), 93-101, 2006

    Japan Society for Educational Technology

References:  19

Codes

  • NII Article ID (NAID)
    110006794605
  • NII NACSIS-CAT ID (NCID)
    AA11964147
  • Text Lang
    JPN
  • Article Type
    ART
  • ISSN
    1349-8290
  • NDL Article ID
    8536857
  • NDL Source Classification
    ZF1(教育)
  • NDL Call No.
    Z7-904
  • Data Source
    CJP  NDL  NII-ELS  J-STAGE 
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