This study investigates the sound quality of /ㅚ/ and /ㅟ/ in Seoul dialect and whether it is diphthong or not through acoustic phonetic approach. According to the regulation of Standard Korean Pronunciation, /ㅚ/ and /ㅟ/ are monothongs, being sounded like a diphthong just in some cases. It was, however, based on the consideration to keep the balance of the phoneme system of Korean language. Even though many researchers have considered them /ㅚ/ and /ㅟ/ as diphthongs. acoustic phonetic study has seldom done on them. Therefore, I aim to reveal the sound quality of /ㅚ/ and /ㅟ/ through the one of the methods of the acoustic phonetics: formant frequency analysis. For this purpose, the 1st(F1) and 2nd(F2) formant frequencies of /ㅚ/ and /ㅟ/ were measured and compared between next 3 conditions like generations: 20s and 60s(older than 50s), speed: slow and ordinary, and whether the initial sound of the syllable where /ㅚ/ or /ㅟ/ is a vowel or a consonant. The result of the analysis is as follows:First, /ㅚ/ is a diphthong both in speeches of speakers in their 20s and 60s. /ㅟ/ is, however, shows the difference between generations, being diphthong in speeches of 20s but monothong in that of 60th. This means that the process of diphthongization of /ㅟ/ is still going, not finished. In addition, /ㅟ/ tends to sound like a monothong more than /ㅚ/, which is very different from the opinions of most researchers. Secondly, as the speed of the speech accelerate to the speed of the ordinary speech, both /ㅚ/ and /ㅟ/ show the tendency to sound like a monothong, which means /ㅚ/ and /ㅟ/ seldom sound like a diphthong in our ordinary speech unless we pronounce them on purpose, even though they themselves are diphthong.Finally, in the syllable whose initial sound is a vowel, /ㅚ/ and /ㅟ/ sound like a diphthong, but in the syllable whose initial sound is a consonant, they sound like a monothong. How /ㅚ/ and /ㅟ/ sound are affected by whether the initial sound of the syllable where they are is a vowel or a consonant. What the consonant is doesn't seem to affect the sound of /ㅚ/ and /ㅟ/.In conclusion, we can know that the diphthongizationin of /ㅟ/ is still in process in modern Seoul dialect because /ㅟ/ is still sound like a diphthoing in 60s. Meanwhile, we can also predict that both /ㅚ/ and /ㅟ/ will be fixed as diphthongs soon because they sound like diphthongs in younger generations like 20s. Thus, the vowel system of Korea language needs to be modified to reflect the pronunciation in real speech. In addition, how /ㅚ/ and /ㅟ/ sound in ordinary speech is affected by how fast the speech is, what is the initial sound of the syllable where /ㅚ/ and /ㅟ/ is, and how many syllables follow after /ㅚ/ and /ㅟ/. We need to study further on these aspects with more sound samples
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