明瞭度試験における異聴の傾向と日本語の了解度 : 室内音響性能評価に関する研究

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When acoustic properties of a room are evaluated, "Method of Articulation Test" is used. "List of Japanese monosyllables" for Articulation Test consists of 100 mono-syllables, which, however, exclude "n", double consonant, long sounds and many other consonants of adopted words. Besides, in Japanese, "G" is often pronounced [g] or [η] and vowels are often pronounced as long sounds. Sometimes some consonant vowels are pronounced without vowel sounds. This paper reports and discusses the results of investigation of distribution of Japanese phonemes, tendency of mishearing in Articulation Tests, and level-fluctuation in speaking Japanese in order to study the correlation between Articulation Test and intelligibility of sentences. Japanese phonemes including adopted words consist of 159 phonemes. Whithout 100 monosyllables for Articulation Test, percentage of the use of 59 phonemes is 17.22%. They should be included in Articulation Test list. In addition to this, frequency of the use of Japanese monosyllables must be taken into account. Syllables frequently misheard belong to the same group in phonetics. So, speakers must be careful for the differences in the pronunciations of these syllables. Sound level-fluctuating is 10dB(A) (in case of a NHK News Anouncer) and about 20dB(A) (in case of a professor), when they speak Japanese. The correlation between Articulation Test and intelligibility of sentences is not clear. But the above mentioned will be useful in solving the possible problems.
明治大学の論文

明瞭度試験における異聴の傾向と日本語の了解度 : 室内音響性能評価に関する研究

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