| Summary: | 碩士 === 國立清華大學 === 語言學研究所 === 103 === This study describes and examines the acoustic properties of the 11 vowels / i, e, ɛ, a1,
a2, o, ɔ, u, ɯ, ɤ1, ɤ2 / in open syllables (CV) and closed syllables, CVN (N=Nasals)
and CVS (Stops), in Hanoi dialect of northern Vietnamese. The results show that (1)
the vowels in open syllables (CV) are much longer than the ones in closed syllables,
and in CVS syllables are the shortest; (2) the acoustic vowel space area of the vowels
in CVS syllables is the smallest. On the contrary, vowels in CV form the largest one;
(3) both (1) and (2) are true for the female and male speakers; (4) the key factor to
distinguish the pairs of vowels [ a1, a2 ] and [ ɤ1, ɤ2 ] is vowel duration; (5) the shorter
vowel duration in closed syllables will not cause target undershoot and vowel
reduction, a counter example to the theory of Lindblom (1963).
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