عنوان مقاله [English]
Formant structure and vowel space are the most important physical features of speech. According to Daniel Jones, a traditional trapezoid can be considered for vowels in most linguistic variants. In acoustic phonology based on the model of Peterson and Barney (1952), considering the formant structure of vowels (F1, F2), for vowels in a language or a specific linguistic variety, it is possible to draw a vowel space, which takes place in the Cartesian coordinate system. This creates a two-dimensional vowel space for the vowels that is close to the Jones Trapezoid, and the number of vowels varies in different varieties. In Persian, a vowel space consisting of six vowels / ᴂ /, / a /, / e /, / o /, / i /, / u / can be shown. This set contains 8 vowels for east Gilaki dialect. / ᴧ /, / a /, / e /, / o /, / i /, / u /, / ə /, / y /. Each of these vowels, based on the values of F1 and F2 obtained from Praat software, clearly finds its position on the diagram and forms the vowel space of the dialects.