nasal cavity(鼻腔) labial cavity(唇腔) the vocal tract
vocal tract pharyngeal cavity glot tis/throat pharynx, velum
these frequencies resonate according to the vocal tract of the
f n = (2n - 1) * c 4l the vocal tract filters the source sound
英语学习 chapter 2 phonology 1ppt 3 cavities of the vocal tract