Development of Multimedia Materials to Improve the Pronunciation of English of Elementary School Teachers from the Perspective of Accuracy and Intelligibility

本研究旨在分析作为教育专业英语教师的日本学生的英语发音有哪些发音不正确，从而影响英语的可理解性。利用这些结果，我们开发了多媒体教学材料来提高他们的英语水平。通过作者的判断和声学分析，所有日本学生发音的单词和句子都被转录成IPA符号，以表明他们的英语的准确性。至于可理解性，以英语为母语的人评估了单词和句子的可理解性。发音有误：(A)/L/和/r/区分，b，(B)擦音替换，(C)擦音发音弱，(D)塞音不送气，(E)元音长度不正确，(F)词、短语重音错误，(G)节奏单调。在这些特征中，(A)(C)(D)(E)(F)会影响清晰度。

This research aims to analyze which phonological features of English pronounced by Japanese students, who majored in Education to be English teachers, are pronounced incorrectly and affect intelligibility. By using these results, we developed multimedia pedagogical materials to improve their English. Through being judged by the authors and being used with acoustic analysis, all the words and sentences pronounced by the Japanese students were transcribed into IPA symbols indicating the accuracy of their English. As for intelligibility, native English speakers evaluated how much the words and sentences were understandable. The following phonological features were pronounced incorrectly:(a) /l/ and /r/ distinction,b,(b) fricative substitutions, (c) weak pronunciation of fricatives, (d) no aspiration of plosives, (e) incorrect vowel length, (f) the wrong stress on words, phrases, (g) monotonous rhythm. Among these features, (a)(c)(d)(e)(f) would affect intelligibility.