How can voice quality help distinguish tones in Hmong-Mien languages?

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Hmong-Mien languages Distribution of Hmong-Mien language family in China and Southeast Asia.

In Hmong-Mien languages, voice quality serves as a critical feature that works alongside pitch to distinguish between different tones. While these languages are primarily tonal, certain tones are defined by specific phonatory characteristics rather than pitch alone.1

These voice quality distinctions include:

Breathy or whispered quality: Certain tones are produced with a breathy or whispered phonation, which helps differentiate them from other tones in the language's inventory.1
Creaky voice quality: This is occasionally used to characterize a tone. It can be approximated by lowering the pitch of the voice until it begins to break.1

By incorporating these variations in vocal fold vibration and airflow, speakers can create additional tonal contrasts beyond simple pitch level or contour distinctions.1