15th International Congress of Phonetic Sciences (ICPhS-15)
Tones may have different shapes when they sit on different durations
of tone-bearing units (TBUs). When a tone sits on a shorter TBU, 'end
truncation', may occur, where the terminal portions are lost or shifted
to the next syllable. This paper focuses on 'end truncation' in the
two Thai contour tones: rising-falling (RF) and falling-rising (FR).
Shorter and longer contours with end truncation were studied and the locations of the truncated portions were quantified based on the three main landmarks (maxima and minima in the first and second derivatives of a 7th order polynomial fit to the raw pitch track). It was found that each contour tone keeps its prominent information on its particular portion in order to be distinguished from other tones.
Bibliographic reference. Roengpitya, Rungpat (2003): "(end) truncation of the Thai contour tones on different durations of TBUs", In ICPhS-15, 1109-1112.