Abstract
A detailed study of normal vibrational patterns of the vocal cords and a preliminary investigation of simple vocal cord pathologies have been conducted. A 16-mass model described in earlier abstracts [Titze and Strong, J. Acoust. Soc. Amer. 51, 138(A) (1972); 52, 123(A) (1972)] represents mucous membrane, vocal ligament, and vocalis muscle. An 18-section vocal tract and a 12-section nasal tract are coupled to this system. Fundamental frequency, vocal dynamics, register, and vibrato are linked quantitatively with the physiological correlates, i.e., subglottal pressure, vocalic contraction, vocal cord length, and elastic properties of vocal ligament and mucous membrane. Interactions between the vocal tract and the glottal source are demonstrated for the vowels /a/ and /i/. An attempt is made to simulate localized mass increase, i.e., a vocal node, and localized stiffening to approximate the effect of a mild cancer. The perturbed vibrational patterns and the corresponding synthesized vowels art, discussed. Samples of normal utterances and slightly pathological utterances are presented for several pitches in modal and falsetto register.
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