Intonation: Theory, Models, and Applications
This paper explores whether a speaker's voice quality changes as a function of variation in speech melody. Analyses are based on several productions of the vowel 'a' provided with different intonation patterns. It appears that fundamental frequency covaries to some extent with the 'strength relationship" between the first two harmonics, which is often claimed to reflect open quotient. However, correlating the H1-H2 measure to parameters of the LF-model reveals that both the open quotient and the skewness of the glottal pulse have an impact on the lower part of the harmonic spectrum.
Bibliographic reference. Swerts, Marc / Veldhuis, Raymond (1997): "Interactions between intonation and glottal-pulse characteristics", In INT-1997, 297-300.