Further evidence of acoustic invariance in speech production: The stop–glide contrast

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Abstract
A detailed comparative acoustic analysis of the labial stop and glide, [b] and [w], was conducted and an invariant acoustic property which can accurately distinguish stops and glides was sought. In experiment I, computer analysis of the labial stop [b] and the labial glide [w] as produced in 5 vowel contexts by 2 speakers was done. Transition durations and formant frequencies often differed considerably in these 2 classes of sounds, and to a much greater extent than suggested in previous perception experiments. In experiment II a measure of amplitude, unit energy, was examined. The degree of relative amplitude change occurring in the vicinity of the stop and glide release was calculated and reliably larger changes in energy associated with the stop release than the glide release across vowel contexts and speakers was found. These changes may provide an invariant property characterizing the stop-glide contrast. In experiment III the generality of these claims was tested by examining a new set of data consisting of the stops [d] and [g] and the glide [y]. Findings were related to a general theory of acoustic invariance in speech.

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