Diplophonia

Diplophonia, also known as diphthongia, is a phenomenon in which a voice is perceived as being produced with two concurrent pitches.[1] Diplophonia is a result of vocal fold vibrations that are quasi-periodic in nature.[2] It has been reported from old days, but there is no uniform interpretation of established mechanisms.[3] It has been established that diplophonia can be caused by various vocal fold pathologies, such as vocal folds polyp, vocal fold nodule, recurrent laryngeal nerve paralysis[3] or vestibular fold hypertrophy.[4]

Diplophonia
V̬‼

The Voice Quality Symbol for diplophonia is V̬‼.

References
  1. Ward; Sanders; Goldman; Moore (1969). "Diplophonia". The Annals of Otology, Rhinology, and Laryngology. 78.
  2. Kiritani; Hirose; Imagawa (1993). "High-speed digital image analysis of vocal cord vibration in diplophonia". Speech Communication. 13.
  3. 吉岡博英 (1987). "二重声の成立機序に関する音響的側面について" (in Japanese). 筑波大学. Retrieved 2015-12-26.
  4. "仮声帯肥大" (in Japanese). sickness-dictionary.jp. Archived from the original on 2016-03-04. Retrieved 2015-12-26.


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