図 5.6: Deviation of a moraic obstruent for the preceding and following phonemes
Basically, there are no striking quality differences between long and short vowels and a long vowel is equal in duration to two short vowels[25]. The vowel duration as mentioned in section 5.3.2 is also applied to them. But there is an interesting study that the variation of vowel length in inverse proportion to the closure time of the following consonant might reflect the speaker's tendency to maximize the perceptual distance between voiced and unvoiced consonants by maximizing the difference in the ratio between the duration of a vowel and that of its neighbouring consonant. However, we did see no evidence from Figure 5.8. In our system, long vowels are counted as two mora length without separating them.
図 5.6: Deviation of a moraic obstruent for the preceding and following phonemes
図 5.7: Deviation of a moraic nasal for the preceding and following phonemes
図 5.8: Deviation of long vowels for the preceding and following manner of articulation
