The Persian Vowel Formant structure of students with Normal, Moderate and severe Hearing Loss aged 15-18 years in Esfahan

• Background:Formant structure is one of the most important acoustic characteristics of Sounds.We can differentiate Vowels according to their first three Formants. Objective measurements of Vowel Formants are more valid than auditory perception in pathologic circumstances including children with hearing impairment. • Material and Methods:In this analytical-descriptive and cross-sectional study we compared the Persian Vowel Formants between 64 Normal and hearing impaired students ranged from 15-18 years Old in Esfahan high school. • Results:The mean of F1, F2, F2/F1 and F3/F1 of Persian vowels in all groups were significantly different (