Third International Conference on Spoken Language Processing (ICSLP 94)
This study analysized the acoustic properties of the vocalic portions of CVC syllables (/sa__/) ending with the unreleased stops /p/, A/, or Ikf. The syllables were Cantonese words spoken in the High Level tone by four female and four male native speakers of Cantonese. The acoustic parameters investigated were the duration of the vowel segment, the fundamental frequency (F0), and the frequencies of the first three formants (Fl, F2,F3). Both the F0 and the formant frequencies were estimated from wide-band FFT spectra at the beginning, the middle and the end of the vowel segment. The results of the analysis showed a small but reliable difference in vowel segment duration among the final stops. The formant frequency pattern at the end of the vowel segment indicated that information about place of articulation is available in the frequency regions of Fl, F2 and F3. Moreover, the F2 and F3 frequencies in the middle of the vowel segment also separated the three stop consonants. The fundamental frequency measurement did not show any differential F0 pattern among the final stops.
Bibliographic reference. Ciocca, Valter / Wong, Livia / So, Lydia K. H. (1994): "An acoustic analysis of unreleased stop consonants in word-final position", In ICSLP-1994, 1131-1134.