Phonetics and Phonology (ENG)
VU the mouth, the vowels are said to be oral if some air is simultaneously
released through the nose, the vowels are nasal. In addition to this, in a phonetic
classification of vowels, reference would generally be made to two variables, the first
of which is easily describable, the second much less so (a) the position of the lips – whether rounded, spread, or neutral (b)
the part of the tongue raised, and the height to which it moves. Acoustically, vowels are mainly distinguished by the first two formant frequencies F and FF is inversely related to the vowel height (which means that smaller F amplitude =
higher vowels, and F is related to the front or back of the vowels (smaller F amplitude = more back vowels. These features will be further elaborated during the part of this course on acoustic phonetics.
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