This paper is an acoustic phonetic description of the vowels and diphthongs in the Yi county dialect and compares the diphthongized vowels with monophthongs and diphthongs in terms of their temporal structures and spectral characteristics. Results show that rising diphthongs have two targets while falling diphthongs only have one dynamic target. Diphthongized vowels occur as an intermediate category between monophthongs and diphthongs. Diphthongized vowels have distinctive onsets but a neutralized offset.
Bibliographic reference. Hu, Fang / Zhang, Minghui (2014): "Diphthongized vowels in the yi county hui Chinese dialect", In INTERSPEECH-2014, 1703-1707.