Summary
Background
The acoustic assessment of phonation after total laryngectomy is challenged by signal
aperiodicity which makes frequency-based acoustic measures less reliable. This is
important for patients who use esophageal voice since voice samples mostly include
type III (highly aperiodic) and 4 (chaotic) signals. As such, using non-linear measures,
which are better suited for aperiodic phonation, may be useful to investigate the
relationship between acoustic signal characteristics and perception of esophageal
voice quality.
Objectives
This study aimed to investigate whether nonlinear dynamic acoustic methods, nonlinear
energy difference Ratio (NEDR) and spectrum convergence ratio (SCR), were correlated
with perceptual measures in subjects who used esophageal phonation.
Methods
Thirty-one subjects who had undergone total laryngectomy and use esophageal voice
as a rehabilitation method were included in this study. Expert and non-expert raters
listened to the esophageal voice samples from the subjects and rated vowels and connected
speech samples on a scale from 1 to 7 on dysphonia severity and intelligibility. In
addition, non-linear acoustic analysis was performed to calculate NEDR and SCR. Analysis
from the raters was compared to the non-linear acoustic analysis to find the correlation
between the variables.
Results
There were no significant correlations between any of the non-linear acoustic measures
NEDR and SCR and the perceptual ratings at the significance level of 0.05. Correlations
were calculated for each acoustic measure among the expert raters and among the non-expert
raters in both connected speech samples and sustained vowel fragments.
Conclusions
In conclusion, the nonlinear dynamic acoustic analyses of spectrum convergence ratio
and nonlinear energy difference ratio do not have a significant correlation with perceptual
measures of esophageal voice.
Key words
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Article info
Publication history
Published online: July 08, 2022
Accepted:
June 3,
2022
Publication stage
In Press Corrected ProofIdentification
Copyright
© 2022 The Voice Foundation. Published by Elsevier Inc. All rights reserved.
