Effects of an Auditor's Past Musical Experience on the Intelligibility of Vowel Sounds in Singing Page: 33
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33
Vowel Migrations or Modifications
One technique many singers use in order to attempt an
improvement in quality and intelligibility at high pitches
is to introduce modifications in their ordinary vowel artic-
ulation when singing at extreme pitch levels. These vowel
modifications can also make it easier for a singer to pro-
duce pitches in the high and in the low range. Appelman
(.3, p. 6) postulates that the proper vowel modifications or
migrations can enable singers to maintain intelligibility of
vowel sounds on high pitches. The fixed-ratio theory
postulates it is impossible to maintain intelligibility of
vowel sounds on high pitches, yet Appelman, in an apparent
contradiction, supports the fixed-ratio theory as well as
the vowel migration theory.
The chart found in Figure 1 outlines Appelman*s system
of vowel migration or modification. The following is an
explanation of the logic of the chart.
The migration chart is a conceptual aid that
compels the singer to create the accurate
phonetic domain of the twelve vowels through
changes of frequency and intensity. The chart
was designed to be a visual and aural device
to preserve the integrity of the vowel by
means of auditory feedback. The logic of the
chart is based upon the acoustical fact that
if the frequency to be sung changes so much as
to go above the frequency of the lowest formant
of the vowel, the resultant sound will be heard
as some other vowel. This acoustic phenomenon
I have called vowel migration (3, p. 7).
Appelman seems to be contradicting himself when he claims
that the chart in Figure 1 shows how to preserve the
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Bradley, C. Mark (Charles Mark). Effects of an Auditor's Past Musical Experience on the Intelligibility of Vowel Sounds in Singing, dissertation, December 1983; Denton, Texas. (https://digital.library.unt.edu/ark:/67531/metadc331919/m1/41/: accessed July 18, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; .