al synthetic two-vowel continua were constructed, each with a varying frequency parameter which crossed a critical distance in either of the 3bark difference dimensions. Critical distances over the 3-bark difference dimensions, estimated by phoneme boundaries calculated from vowel identification tests, will be compared with each other and with previous estimates. Some effects of duration on the phoneme boundary estimates of critical distance will also be discussed. [Work supported by NIH]. 1:47 SS2. A pereeptually based approach to F0 characterization. While researchers applying quantitative techniques to the characterization of intonation patterns [W. E. Cooper and J. M. Sorensen, Funda-mentalFrequency in Sentence Production (Springer-Verlag, Berlin, 1981)] have claimed success in relating phenomena such as F0 "resetting" to the presence of syntactic boundaries [J. Breckenridge and M. Y. Liberman, "The declination effect in perception," unpublished manuscript, Bell Laboratories (1977)], this procedure has been confined to a highly limited corpus of short, simple-declarative read sentences. The degree to which these models can be generalized to spontaneous speech has recently become the subject of controversy [N. Umeda, J. Phonet. 10, 279-290 (1982)]. We therefore examined a corpus of spontaneous and read speech with the intent of finding a quantitative characterization which could be applied across speaking conditions. To this end, we analyzed the data using the "topline" modeling procedure, as well as peak, valley, and allpoints rms lines, computed by linear regression. In simple-declarative clauses and sentences, the "topline" model performed adequately. The all-points rms line also performed well and captured the greater degree of variance occuring in spontaneous speech. Given this result, and for reasons of computational simplicity, we felt that an all-points rms line was superior in characterizing the data. This rms model is consistent with auditory processing models.
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