Abstract
This research examined the segmental-contextual effects on the continuancy of the voiced dental /■/ in American-English and whether certain acoustic attributes were preserved despite possible modification. Word-initial /■/ cases, extracted from continuous speech of 146 speakers from the TIMIT database, were frequently (averaging 65%) stoplike when it was in utterance-initial position or when its preceding phoneme was voiceless and/or [-continuant]. This stoplike modification occurred less frequently (averaging 39%) when /■/ was preceded by a voiced fricative and rarely (averaging 13%) when preceded by a vowel or liquid consonant. A comparison of stoplike /■/ and /d/ cases under similar contexts showed that the burst peak location, burst spectrum shape, and F2 at vowel onset averages were all statistically different between the two groups. In addition, the acoustic data suggested that the dental place of articulation was preserved for the modified /■/. Preliminary automatic classification experiments involving salient acoustic attributes seemed to indicate that F2 at vowel onset may be a reliable cue for the dental place of articulation in /■/. [Work supported by NIH DC02978 and T32DC00038.]
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