Aerodynamics of Vocal Vibrato.
Degree: PhD, Communication Disorders, 2017, Bowling Green State University
Airflow vibrato is the fluctuation in average
airflow while singing with vibrato. Understanding airflow vibrato
relates to a deeper understanding of its importance to
physiological, pedagogical, and clinical aspects. Two studies were
performed to examine airflow vibrato. The subjects for Study 1 were
four professional Western classical singers, and for Study 2 four
highly trained amateur singers. Aerodynamic and acoustic measures
were compared among vibrato, bleating (a primarily adductory
gesture), and external epigastric pumping (EEP, a primarily
subglottal pressure manipulation). Utterances included speaking
(phonation and whisper) and singing (constant /a/ vowel, different
pitches and loudness levels). Study 1
demonstrated how airflow vibrato compares with fundamental
frequency (F0) and intensity vibrato. The correlation between rates
of airflow and F0 vibrato was moderately strong. Mean airflow
vibrato extents were larger for the female singers than for the
male singers, and increased with pitch increase for all four
singers. For the males, average airflow extent was 30 and 75 cm3/s
for their lower and higher pitch, respectively, and for the
females, 47 cm3/s and 94 cm3/s for their lower and higher pitch,
respectively. Study 2 was undertaken to better
understand sources of airflow vibrato. Airflow modulations were
produced during singing with vibrato and also while bleating and
with external epigastric pumping. Bleating had the fastest
alteration rate (9.5-12 Hz), whereas the other types had similar
rates (vibrato: 4.8-6.0 Hz; EEP: 6.0–7.5 Hz). During phonation
(combining all conditions), bleating had the largest airflow
modulation extents (on average 144 cm3/s, compared to 30 cm3/s for
vibrato and 46 cm3/s for EEP). Overall results
suggest that airflow vibrato typically leads F0 vibrato, and often
has a more complex waveshape than F0 vibrato. Hypotheses generated
from the study include: (1) A primarily subglottal pressure driven
vibrato may provide relatively consistent but wide extents for both
F0 and airflow vibrato. (2) A primarily glottal adduction driven
vibrato may provide relatively low and inconsistent F0 vibrato
extent, and high and inconsistent airflow extent. (3) A primarily
CT driven vibrato may result in moderate to large F0 vibrato
extent, and low airflow vibrato extent, with variable consistency.
Advisors/Committee Members: Scherer, Ronald (Advisor).
Subjects/Keywords: Health Sciences; Music; Speech Therapy; Airflow vibrato; Aerodynamics; Singing voice; Vibrato; Bleat; External epigastric pumping; Electroglottography; Intensity vibrato; Fundamental frequency vibrato; Western classical singing
Interaction between airflow, F0, intensity, and Ps vibrato… …26
Study 1: airflow vibrato in four professional singers… …26
Study 2: sources of airflow vibrato… …29
Study 1: airflow vibrato in four professional singers… …29
Study 2: sources of airflow vibrato…
to Zotero / EndNote / Reference
APA (6th Edition):
Nandamudi, S. (2017). Aerodynamics of Vocal Vibrato. (Doctoral Dissertation). Bowling Green State University. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1499427478103556
Chicago Manual of Style (16th Edition):
Nandamudi, Srihimaja. “Aerodynamics of Vocal Vibrato.” 2017. Doctoral Dissertation, Bowling Green State University. Accessed January 18, 2021.
MLA Handbook (7th Edition):
Nandamudi, Srihimaja. “Aerodynamics of Vocal Vibrato.” 2017. Web. 18 Jan 2021.
Nandamudi S. Aerodynamics of Vocal Vibrato. [Internet] [Doctoral dissertation]. Bowling Green State University; 2017. [cited 2021 Jan 18].
Available from: http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1499427478103556.
Council of Science Editors:
Nandamudi S. Aerodynamics of Vocal Vibrato. [Doctoral Dissertation]. Bowling Green State University; 2017. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1499427478103556