Speaking-Rate-Induced Variability in F2 Trajectories This study examined speaking-rate-induced spectral and temporal variability of F2 formant trajectories for target words produced in a carrier phrase at speaking rates ranging from fast to slow. F2 onset frequency measured at the first glottal pulse following the stop consonant release in target words was used to quantify the ... Research Article
Research Article  |   October 01, 1998
Speaking-Rate-Induced Variability in F2 Trajectories
 
Author Affiliations & Notes
  • Kris Tjaden
    State University of New York at Buffalo
  • Gary Weismer
    University of Wisconsin-Madison
  • Contact author: Kris Tjaden, Department of Communicative Disorders and Sciences, SUNY–Buffalo, 109 Park Hall, Buffalo, NY 14260
Article Information
Hearing & Speech Perception / Acoustics / Speech, Voice & Prosody / Speech / Research Articles
Research Article   |   October 01, 1998
Speaking-Rate-Induced Variability in F2 Trajectories
Journal of Speech, Language, and Hearing Research, October 1998, Vol. 41, 976-989. doi:10.1044/jslhr.4105.976
History: Received May 27, 1997 , Accepted April 27, 1998
 
Journal of Speech, Language, and Hearing Research, October 1998, Vol. 41, 976-989. doi:10.1044/jslhr.4105.976
History: Received May 27, 1997; Accepted April 27, 1998

This study examined speaking-rate-induced spectral and temporal variability of F2 formant trajectories for target words produced in a carrier phrase at speaking rates ranging from fast to slow. F2 onset frequency measured at the first glottal pulse following the stop consonant release in target words was used to quantify the extent to which adjacent consonantal and vocalic gestures overlapped; F2 target frequency was operationally defined as the first occurrence of a frequency minimum or maximum following F2 onset frequency. Regression analyses indicated 70% of functions relating F2 onset and vowel duration were statistically significant. The strength of the effect was variable, however, and the direction of significant functions often differed from that predicted by a simple model of overlapping, sliding gestures. Results of a partial correlation analysis examining interrelationships among F2 onset, F2 target frequency, and vowel duration across the speaking rate range indicated that covariation of F2 target with vowel duration may obscure the relationship between F2 onset and vowel duration across rate. The results further suggested that a sliding based model of acoustic variability associated with speaking rate change only partially accounts for the present data, and that such a view accounts for some speakers' data better than others.

Acknowledgments
This work was supported by NIH Grant DC00319. Portions of this paper were presented at the 131st meeting of the Acoustical Society of America, Indianapolis, IN. We thank Maureen Stone and three anonymous reviewers for their comments on earlier drafts of the paper.
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