Abstract
Are the effects of changes in speech rate on F2 transition slopes in languages with and without unitary diphthongs explicable in terms of general phonetic and physiological principles? Five American English diphthongs and four Japanese vowel sequences were recorded, spoken at three different tempos by eight and seven speakers, respectively. LPC spectra were computed at 10‐ms intervals, and the resulting F2 contours were analyzed by a computer program designed to objectively define and measure steady‐state and transitional portions of the vowel. Contrary to the claims of Gay [J. Acoust. Soc. Am. 44, 1570–1573 (1968)], speech rate was found to significantly affect two measures of transition slope in English, with slope decreasing as speech rate increased. Individual diphthong populations in both languages displayed high correlations between a transition, slope and its F2 range, indicating that rate adjustment is not simply a matter of target undershoot at faster speeds. Japanese showed less rate‐dependent variability, suggesting that temporal reorganization for different speech rates is affected by language‐specific structures. [Work supported by NIH.]
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