Physiology and Definition
The whistle register is the highest phonational register, that in most singers begins above the soprano "high C" (C6 or 1,046.5 Hz) and usually extends to about two Ds above (D7 or 2349.3 Hz). The lower part of the whistle register may overlap the upper parts of the modal and falsetto registers, making it possible for singers to phonate these notes in different ways. However, fundamentally the whistle register is most commonly used to produce pitches above C6. As with the other vocal registers, the whistle register does not begin at the same point within every voice, and there are rare voices which can extend the whistle register much higher or lower than the range listed above. For example, some opera singers can sing up to the "high" F above "high" C without entering into the whistle register.
The physiology of the whistle register is the least understood of the vocal registers. Unlike other types of vocal production, it is difficult to film the vocal cords while they are operating in this manner as the epiglottis closes down over the larynx and the resonating chamber assumes its smallest dimensions. It is known that when producing pitches in this register, vibration occurs only in some anterior portion of the vocal folds. This shorter vibrating length naturally allows for easier production of high pitches.
Although the whole physiological production of whistle tone is not understood, it is known that when the laterals are active but the transversus inactive, a triangular opening is seen between the arytenoids, the vocal processes contact each other, but the posterior parts at the apex do not contact each other. The exception to this would be if the vocal folds are not stretched, as stretching of the vocal ligaments abducts the vocal processes.
Read more about this topic: Whistle Register
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