Voice production and the verbal expression through speech are crucial components of human communication. The human voice is not just conveying information directly through words, but also indirectly as paralinguistic information such as the speaker’s emotional state through tonality (Zhang, J Acoust Soc Am, 140(4):2614–2635, (2016), [7]). As such, voice is generated through a two-part process:
... [Show full abstract] First, a source signal is produced by the vocal folds that are pulsating the lung pressure and volumetric flow rate in a particular frequency through periodic opening and closing. Second, the vocal tract causes an attenuation or amplification of this source signal at certain frequencies depending on its specific shape. The voice generation process can therefore be described by a source-filter model with the vocal folds acting as the source and the vocal tract as an acoustic filter (Titze, Alipour, The myoelastic aerodynamic theory of phonation. National Center for Voice and Speech, (2006), [6]). Thus, we are able to produce different vowels and sounds as we manipulate the vocal tract during phonation.