Diplophonia

Diplophonia
V̬‼

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]

The Voice Quality Symbol for diplophonia is V̬‼.

References

1. Ward; Sanders; Goldman; Moore (1969). "Diplophonia". The Annals of Otology, Rhinology, and Laryngology. 78 (4): 771–777. doi:10.1177/000348946907800409. PMID 5799401. S2CID 208953905.
2. Kiritani; Hirose; Imagawa (1993). "High-speed digital image analysis of vocal cord vibration in diplophonia". Speech Communication. 13 (1–2): 23–32. doi:10.1016/0167-6393(93)90056-Q.
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.