Vocal Tract Morphology in Inhaling Singing: Characteristics During Vowel Production-A Case Study in a Professional Singer

A smaller mouth opening, a narrowing of the subglottic space, a larger supralaryngeal inlet, and a smaller antero-posterior tongue diameter can be considered as morphological characteristics for reverse phonation. Acoustically, reverse phonation discretely contains more noise and perturbation. The formant frequency distribution concurs with a mouth narrowing and pharyngeal widening during inhaling.