元音归类方式.ppt

* 英语元音归类方式及描述方式 王明园，郭怀芸，邹荣珍 The Definition of Vowel In phonetics, a vowel is a sound in spoken language, such as English ah ![ɑ:] or oh![?u], pronounced with an open vocal tract(声道) so that there is no build-up of air pressure at any point above the glottis（声门）. This contrasts with consonantswhere there is a constriction（压缩） or closure（关闭） at some point along the vocal tract. Ter a descri??o do cargo Conhecer os pré-requisitos da vaga Conhecer os requisitos esperados pela área solicitante Ter a percep??o adequada do perfil desejado Ter a descri??o do cargo Conhecer os pré-requisitos da vaga Ter a percep??o adequada do perfil desejado Ter a descri??o do cargo Conhecer os pré-requisitos da vaga The lenght of the vowels The shape of the lips The position of the tongue in the mouth The openness of the mouth FACTORS Distinguished by ESCOLHER BACK FRONT CENTRAL  Vowels may be distinguished as front, central ,and back according to which part of the tongue is held highter Front Vowel - A front vowel is one in the production of which the front part of the tongue maintains the higher position.- The English front vowels include /i:/, /I/ ,/e/, /?/  Central Vowel - if it is the central part of tongue that is held hightest ,the vowels thus produced are called central vowels - The English central vowels include /?/, /?:/ , /Λ/  Back Vowel - If we raise the back of the tongue highter than the rest of it ,we produce the back vowels - -The English back vowels include /u/ /U:/ /O/ /O:/ /A:/  Aor further distinguish members of each group ,we need to apply another criterion,i.e. the openness of the mouth Semi -close vowels /e/ /E:/ Semi -open vowes /E/,/O/： Open vowels /AE/, /A/, /V/, /X/,/ A:/ Close vowels /i:/, /i/, /u/, /u:/ Classification according to the shape of the lips In English , all the front vowels and the central vowels are unrounded vowels ,i.e. without rounding the lips, and all