Phonation type controls the source rate
Hansang Park · The Journal of the Acoustical Society of America · 2001
The ratio of the source characteristic between the two harmonics in the relation of an octave was derived from the combined source and radiation characteristics, which shows that the source rate varies with frequency. A general term for harmonics was established from the ratio, where the higher harmonics are anchored to the fundamental component, such that the source and radiation characteristics of the higher harmonics can be represented in terms of those of the fundamental component. A new measure of phonation type was designed incorporating the varying source rate. Furthermore, it was claimed that phonation type controls the source rate. A phonation-type index k was proposed to account for variation in phonation type. The rationale for proposing the phonation-type index k is that phonation type is independent of the specific values of fundamental frequency but anchored to the fundamental component, and phonation type systematically contributes to the harmonics but not to the fundamental component. The phonation-type index k involves both open quotient and spectral tilt. The phonation-type index k may show unique distributions across speakers and contexts, and may account for modes of phonation type.