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Laryngeal adjustment in voiceless consonant production : I . An experimental study of glottal abduction in loud versus normal speech

Glottal abduction amplitude and duration during normal and loud speech were investigated by means of simultaneous recordings of transillumination, fiberoptic films and acoustics. Three German speakers were recorded producing several voiceless consonants and consonants clusters in word initial and word medial position. The aim of our study was to extend previous work on Danish /p/ (Andersen 1981) and test his model. Andersen proposed that loudness variations would coincide with a larger glottal opening amplitude for louder speech, but with no differences in the overall glottal opening duration. Our results concerning the production of voiceless consonants in word initial position are generally in agreement with Andersen’s proposal. However, results for glottal opening in word medial position did not show similar differences. The amplitude of glottal opening in this position is considerably reduced for both normal and loud speech so that differences often diminish. Another intruigung question arises, although limited to our results in word initial position: Are the observed differences in glottal aperture controlled by the neural nervous system or are they due to physical factors (increased subglottal pressure in loud speech) or both? Further modelling work on this issue is presented in Van Hirtum (submitted to this conference).