An investigative report on the Akita dialect speech phenomenon: based on the true state of several elderly speakers

This paper investigates several elderly speakers to study certain speech phenomena that characterize the Akita dialect, and reports the existing state of each. Specifically, the confusion of /i/ /e/; the confusion of /si/ /su/; the vocalization and nasalization of /t/ /d/; Ha group labial sound; and Ka group / Ga group contracted sounds are reported. The reason for the focus on these points is because the author has shown that according to investigations to date there is a tendency for each of the phenomena described above to decline a little, there are various stages of change in the process, and big differences depending on the individual are evident. Based on this research background, in addition to conducting a survey of many elderly people in this paper, we used acoustic analysis and mouth shape analysis methodologically to ensure objective investigation of the true state. The study revealed in each phenomenon, while something maintains the dialect sounds and in the same way communize the language, there are things that show the difference in the position of articulation and its duration or the shape of the lip, and it became clear that each can be regarded as various aspects of speech reflecting gradual characteristics of change