Third International Conference on Spoken Language Processing (ICSLP 94)
To examine the possibility that pharyngeal voice quality settings are not independent of pitch differences or of their effect on each other, pharyngealized voice, faucalized voice, raised-larynx voice and lowered-larynx voice were produced under controlled phonetic conditions at eight separate, incremental pitch intervals and analyzed using auditory, spectrographic, and vowel-formant tracking. Results suggest an interdependent relationship between raised-larynx voice and pharyngealization, and between lowered-larynx voice and faucalization. These relationships are realized at several pitch increments, and may reflect some pitch dependence; that is, pharyngealized voice may mask raised-larynx voice at low frequencies, and faucalization may mask lowered-larynx voice auditorily at high frequencies. At the highest frequencies (falsetto range), pharyngealized and faucalized voices, and to some extent lowered-larynx voice, cannot be distinguished. A close front vowel is differentiated the most consistently, while a close back vowel is most often undifferentiated for pharyngeal quality. To explain these relationships, it is posited that for raised-larynx voice at certain (low) frequencies, the vocal tract is configured in a manner that is the same as for pharyngealization; and that for faucalization at certain (low) frequencies, the vocal tract is configured in a manner that is the same as for lowered-larynx voice.
Bibliographic reference. Esling, John H. / Heap, Lynn Marie / Snell, Roy C. / Dickson, B. Craig (1994): "Analysis of pitch dependence of pharyngeal, faucal, and larynx-height voice quality settings", In ICSLP-1994, 1475-1478.