Previously undescribed vowel type: dufons

In general phonetics, vowels are considered as speech sounds pronounced without any stricture in the epiglottic cavities, with the lips, tongue, and soft palate playing a special role in their formation. In terms of structure, a distinction is made between monophthongs and diphthongs. We believe vowel formation to be influenced by numerous barriers and regard the role of lips, tongue, and soft palate as secondary one, that is, they provide only additional articulation. Of particular interest is the function of larynx with its different departments and folds. We assign a special role in the formation of vowels to vocal folds. We define vowels as laryngeal-ligamentous glottal-non-glottal and distinguish between laryngeal-rounded and laryngeal-non-rounded sounds. According to this account, a detailed acoustic analysis of linguistic material in different languages (Bashkir, Surgut dialect of Khanty, Orochon, Mennonite language) revealed a new type of vowels that had not been described in the scientific literature before. We termed such vowel sounds dufons with the following definition: dufons are semi-long laryngeal-ligamentous glottal-non-silent (vowel) sounds with a complex structure: they have two vocal components of different types and unequal durations within one core without a glottal insertion (for example, oѣa, oѣъ, eѣa).