The study is concerned with a longitudinal acoustic analysis of two sets of recordings from the same four speakers over an interval of between 29 and 50 years. The aim was to determine whether there is any evidence for age-related acoustic changes. Our analysis showed that the same speakers have lower f0, a lower F1, a marginally lower F2, and an unchanging or sometimes higher F3 in their later recordings. There is some suggestion from these data that the change in F1-f0 in Bark from earlier to late recordings is proportional to the change in F3-F2 in Bark. This suggests that there is shift in the speaker space roughly along a diagonal in the phonetic height x backness plane with increasing age.
Bibliographic reference. Harrington, Jonathan / Palethorpe, Sallyanne / Watson, Catherine I. (2007): "Age-related changes in fundamental frequency and formants: a longitudinal study of four speakers", In INTERSPEECH-2007, 2753-2756.