15th International Congress of Phonetic Sciences (ICPhS-15)
Measures of spectral tilt, such as H1*-A1, H1-A2, and H1*-A3*, have not considered the effects of both fundamental frequency and vowel quality. These measures represent specific amplitude differences at particular instances of formant frequency, not as a simple and unified value of the overall spectral tilt. I propose phonation type index k, a new measure of spectral tilt which is free from the effects of fundamental frequency and vowel quality, by extending the Source Filter Theory with the addition of a component controlling spectral tilt. The results showed that phonation type index k is useful in describing the overall spectral tilt. In particular, the distribution of phonation type index k was close to normal and varied with speaker.
Bibliographic reference. Park, Hansang (2003): "Phonation type index k: a new measure of spectral tilt", In ICPhS-15, 2201-2204.