Creaky voice
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Creaky voice (also called laryngealisation or vocal fry, especially in the US), is a special kind of phonation in which the arytenoid cartilages in the larynx are drawn together; as a result, the vocal folds are compressed rather tightly, becoming relatively slack and compact, and forming a large, irregularly vibrating mass. The frequency of the vibration is very low (20–50 pulses per second, about two octaves below normal voice) and the airflow through the glottis is very slow. A slight degree of laryngealisation, occurring e.g. in some Korean consonants is called "stiff voice".
Creaky voice manifests itself in the idiolects of some American English speakers, particularly at the beginnings of sentences that the speaker wishes to "soft-pedal". The "eh" of "Eh, I don't know about that." is frequently pronounced in creaky voice. This phenomenon is more prominent among female American English speakers than among male speakers.
It can also occur accidentally when the speaker's throat is tired.