Spectral Characteristics of Nasalization and a Measure of the Degree of Nasality of Oral Vowels

The study attempts to identify a reselected set of measures that can reflect the difference in the degree of nasality between the oral vowel and the nasalized vowel within a pair and the measures that can be used to compare the degree of nasality of a pair of oral vowels with similar vowel height in the acoustic vowel space, based on the spectral characteristics of nasal consonants and vowel nasalization, and, as a supplementary method, to examine whether the degree of nasality of the front vowel is higher than that of the back vowel with similar vowel height in the acoustic vowel space of oral vowels without using nasometry, in order to explain the difference in the front–back asymmetry between the vowel space of nasal vowels and that of oral vowels. The recordings include nasal consonants, oral vowels and nasalized vowels produced normally (without a nose clip), and oral vowels and nasalized vowels produced with a nose clip or other methods affecting the part of the signal corresponding to the nasal branch.