開央不圓唇元音

開央不圓唇元音或低央不圓唇元音是元音的一种，用于一些口语当中。国际音标没有特定的字母表示介于前音[a]和后音[ɑ]之间的元音，通常以⟨a⟩表示。若要加以严格区分，则使用附加符号标明，诸如央元音化的⟨ä⟩或音位偏后的⟨a̠⟩，但并不通用。

開央不圓唇元音
ä
a̠
ɑ̈
ɐ̞
IPA編號	304 415
編碼
HTML碼（十進制）	a​̈
Unicode碼（十六進制）	U+0061 U+0308
X-SAMPA音標	a_"、a_-、A_"或6_o
音頻範例
來源 · 幫助

直至最近，字母⟨a⟩仍在非官方场合下用于央元音，并被大量用于现有语音学上的标示。因此常使用[a]表示央元音，并近似开前元音，若有必要，则使用[æ]，非正式情况下当作次开元音。此外，汉语言学界会用非官方符号⟨ᴀ⟩（小型大写字母A）。国际语音学协会2011–2012年投票否决了这个非官方的音标符号。^[1]

特徵

• 其元音高度為開，這意指舌頭的位置會盡量遠離齒齦。

• 其元音舌位是央，表示舌的位置是在央元音的地方，大約在前元音和後元音中間。

• 其圓唇度為不圓唇元音，嘴唇自然放鬆，不特別向前突起。

注释

1. Keating (2012:245頁)

参考资料

• Carbonell, Joan F.; Llisterri, Joaquim, Catalan, Journal of the International Phonetic Association, 1992, 22 (1–2): 53–56, doi:10.1017/S0025100300004618
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• Fougeron, Cecile; Smith, Caroline L, French, Journal of the International Phonetic Association, 1993, 23 (2): 73–76, doi:10.1017/S0025100300004874
• Gussenhoven, Carlos, Dutch, Journal of the International Phonetic Association, 1992, 22 (2): 45–47, doi:10.1017/S002510030000459X
• Hillenbrand, James M., American English: Southern Michigan, Journal of the International Phonetic Association, 2003, 33 (1): 121–126, doi:10.1017/S0025100303001221
• Ikekeonwu, Clara, Igbo, Handbook of the International Phonetic Association: 108–110, 1999, ISBN 0-521-63751-1
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• Keating, Patricia A., IPA Council votes against new IPA symbol, Journal of the International Phonetic Association, 2012, 42 (2): 245 [2014-04-06], doi:10.1017/S0025100312000114, （原始内容存档于2012-11-11）, with only 15 of 30 members voting [by email], the vote was 8 in favor, 7 against. [...] With all 30 members of the Council voting [again six months later], the resolution was defeated: 17 no, 12 yes, 1 abstention. The IPA will therefore not be adding a symbol for this vowel to the alphabet or chart.
• Labov, William; Ash, Sharon; Boberg, Charles, The Atlas of North American English, Berlin: Mouton-de Gruyter, 2006, ISBN 3-11-016746-8
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延伸阅读

• Barry, William; Trouvain, Jürgen, Do we need a symbol for a central open vowel?, Journal of the International Phonetic Association, 2008, 38 (3): 349–357