Tongue–Palate Contact Pressure, Oral Air Pressure, and Acoustics of Clear Speech

Author:

Searl Jeff1,Evitts Paul M.1

Affiliation:

1. Bowling Green State University, Bowling Green, OH

Abstract

Purpose The authors compared articulatory contact pressure (ACP), oral air pressure (Po), and speech acoustics for conversational versus clear speech. They also assessed the relationship of these measures to listener perception. Method Twelve adults with normal speech produced monosyllables in a phrase using conversational and clear speech. Target phonemes were /t, d, s, z, l, n/. ACP was measured at a point of articulatory contact; Po was sensed by a catheter open in the posterior oral cavity. Results ACP was increased to a greater extent in clear speech for /t, d, z/. Po was increased to a greater extent for /t, d/. Acoustic changes also occurred in terms of segment durations, speaking rate, and CV dB ratio. Regression analysis indicated that segment duration was the strongest predictor of listener ratings of speech clarity, followed by an index of articulatory effort and speaking rate. Conclusion Articulatory effort, as indexed by ACP, Po, and CV dB ratio, was increased to varying degrees depending on the consonant. Greatest changes occurred for /t, d/. Durational measures at both the segment and the phrase level were also important for predicting listener ratings of speech clarity.

Publisher

American Speech Language Hearing Association

Subject

Speech and Hearing,Linguistics and Language,Language and Linguistics

Reference39 articles.

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2. Pressure-flow measurements for selected oral and nasal sound segments produced by normal adults;Andreassen M. L.;The Cleft Palate–Craniofacial Journal,1992

3. Peak Intraoral Air Pressures During Speech

4. Intraoral Air Pressure During the Production of /p/ and /b/ by Children, Youths, and Adults

5. Boersma P. & Weenink D. (2008). PRAAT: Doing phonetics by computer (Version 4.0.22) [Computer software]. Available from www.praat.org

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