The purpose of this study is to examine how Korean Japanese learners pronounce ‘za-gyo’ and ‘zja-gyo’ by comparing them with Japanese native speakers through an acoustic analysis. The results of quantifying the frequency component and the presence of the voice bar as the acoustic characteristic are as follows.
(1) frequency component
① Japanese native speaker:
‘za-gyo’ 6350Hz~9300Hz. Energy is concentrated in high frequency band.
‘zja-gyo’ 3200Hz~6300Hz. Energy is concentrated in middle frequency band.
② Korean native speaker: Both ‘za-gyo’ and ‘zja-gyo’ 3100Hz~9450Hz. Energy spreads from middle to high frequency band.
The difference between the two suggests that the aspiration of the Korean speaker is stronger than that of the Japanese speaker.
(2) voice bar
Depending on the sound environment of the consonants and the subsequent vowels, it was possible to check for vocal vibration. For example, the lack of the voice bar can be seen in the anlaut consonant /z/ before the succeeding vowel /o/ and also in the syllable consonant /z/ before the vowel /u/.
In the above results, the reason why the pronunciation of ‘za-gyo’ and ‘zja-gyo’ of the Korean Japanese learners is unnatural to the Japanese speaker is because of the tendency as the change o ‘za-gyo’ pronunciation to ‘zja-gyo’ pronunciation, the change of affricate as ‘za-gyo’ and ‘zja-gyo’ to ‘cja-gyo’, the change of voiced fricative to voiceless sound, and the substitution to Korean fricative.