Abstract
An apparatus was constructed to study the effects of subglottal and supraglottal resonances on voice production in excised human larynges. The approach was based on an earlier study of W. Trendelenburg and H. Wullstein [summary by D. S. Cooper in Otolaryngology—Head and Neck Surgery, edited by C. W. Cummings et al. (Mosby, 1986), Vol. 3, pp. 1766–1776]. The resonance of the pseudolung was adjustable, while variation of supraglottal resonances was achieved by construction of vowel resonators based on Fant's area functions. Activity of intrinsic laryngeal muscles was simulated by weights attached through pulleys to the larynx. In order to examine the effect of acoustic loading with a full range of variation of the first formant, voice production with supraglottal resonances based on /i/ and /o/ was compared with phonation without the resonator. The resting glottal configuration and average air flow were maintained constant, while the effects of varying supraglottal resonances on voice production were observed in terms of acoustic and glottographic measurements.
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