The Devoicing Intensity of Vowels [I] and [Ɯ] in Japanese Language

Abstract

This study investigates the devoicing intensity of the high front vowel [I] and the high back vowel [Ɯ] in the Japanese language. The research aims to analyze the acoustic characteristics of these devoiced vowels, specifically focusing on their duration and the completeness of vocal fold vibration cessation. A total of 120 speech samples from native Japanese speakers were analyzed using Praat software. The findings indicate that the devoicing of [I] is more frequent and complete than that of [Ɯ], suggesting a greater influence of surrounding phonetic contexts on the devoicing process of [I]. This research contributes to a deeper understanding of Japanese phonology and provides insights into the intricate mechanisms of vowel devoicing.