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Speaking-rate-induced variability in F2 trajectories

K Tjaden1, G Weismer

  • 1Department of Communicative Disorders and Sciences, State University of New York at Buffalo, 14260, USA.

Journal of Speech, Language, and Hearing Research : JSLHR
|October 15, 1998
PubMed
Summary

Speaking rate significantly impacts speech acoustics, affecting F2 formant trajectories. A sliding gestures model partially explains acoustic variability, with individual differences observed across speakers.

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Area of Science:

  • Phonetics
  • Speech Acoustics
  • Linguistics

Background:

  • Speaking rate influences speech sound production.
  • Understanding acoustic variability is crucial for speech processing models.

Purpose of the Study:

  • To investigate how speaking rate affects spectral and temporal variability of F2 formant trajectories.
  • To quantify gestural overlap using F2 onset and target frequencies.

Main Methods:

  • Analysis of F2 formant trajectories for target words in a carrier phrase.
  • Measurement of F2 onset and target frequencies at varying speaking rates (fast to slow).
  • Regression and partial correlation analyses to examine relationships between acoustic measures and vowel duration.

Main Results:

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  • 70% of regression functions relating F2 onset and vowel duration were significant.
  • The strength and direction of these effects varied, deviating from simple sliding gesture models.
  • Vowel duration covariation with F2 target frequency can obscure F2 onset-vowel duration relationships.

Conclusions:

  • A sliding gestures model only partially explains acoustic variability due to speaking rate.
  • Individual speaker data show differential adherence to the sliding gestures model.
  • Complex interactions between gestural overlap, vowel duration, and speaking rate influence speech acoustics.