ホルマント周波数の時間変化パターンと2連および3連母音の知覚

概要

論文の詳細を見る
A perceptual experiment is performed for two forms of non-stationary synthetic vowels. First, three-vowel sequences of the form /uVu/ are synthesized by a terminal-analog speech synthesizer as the test stimuli. The second formant frequency of the middle vowel is changed along a stimulus continuum raging from /u/ to /i/, while other formant frequencies are held constant. Two parameters, the rate of formant transition and the duration of the stationary part of the middle vowel, are taken into account as the possible factors that may have effects on vowel perception. A significant shift in the perceptual phoneme boundary between /u/ and /i/ for the middle vowels is found to occur owing to the surrounding vowels /u/. But, neither of the two parameters described above has a large effect on the vowel identification. Second, two-vowel sequences of the forms /uV/ and /Vu/ are used as the test stimuli of find out which vowel, preceding, has a more important influence on the vowel perception in terms of boundary shift. The results reveal that the perceptual phoneme boundary between /u/ and /i/ for the vowel /V/ in the form /Vu/ shifts to a considerable extent towards the /u/ area compared with that of /uV/. This indicates that the succeeding vowel has a more important influence that the preceding one on the phoneme identification of a vowel in connected speech.
社団法人日本音響学会の論文
1980-12-25