Arabic Vowel Discrimination Using Adabtive Threshold Wavelet Algorithm

In speaking, vowels are produced by exciting an essentially fixed vocal tract shape with quasi-periodic pulses of air caused by the vibration of the vocal cords. The way in which the cross sectional area varies along the vocal tract determines the resonance frequencies of the tract (the formants) and thereby the sound that is produced. The vowel sound produced is determined primarily by the position of the tongue, but the positions of the jaw, lips, and to a small extent, the velum, also influence the resulting sound. A convenient and simplified way of classifying vowel articulatory configurations is in terms of the tongue hump position (i.e., front, mid, back), and tongue hump height (high, mid, low), where the tongue hump is the mass of the tongue at its narrowest constriction within the vocal tract. According to this classification the vowels /i/, /I/, /æ/, and /ε/ are front vowels, (with different tongue height) /a/, /Λ/, and /c/ are mid vowels, and /U/, /u/, and /o/ are back vowels.