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Degré d'ouverture

En phonétique et phonologie, le degré d'ouverture (parfois appelé hauteur de voyelle) ou souvent simplement ouverture est un caractère qui indique la position verticale de la langue par rapport au palais, lors de l'émission d'un son de voyelle. Le premier formant d'une voyelle (F1) correspond habituellement au degré d'aperture, une valeur élevée de F1 correspondant à une voyelle ouverte, et une valeur faible de F1 à une voyelle fermée.

L'alphabet phonétique international identifie sept degrés différents, bien qu'aucune langue ne les distingue tous :

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Degré d'ouverture
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