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KMID : 1036820170220030587
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Communication Sciences & Disorders
2017 Volume.22 No. 3 p.587 ~ p.596
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Usefulness of Cepstral Acoustic Index for Estimating Objective Dysphonia Severity
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Yu Mi-Ok
Choi Seong-Hee
Choi Chul-Hee
Lee Kyung-Jae
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Abstract
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Objectives: Traditional perturbation analysis using MDVP (Multi-Dimensional Voice Program) often fails on acoustic measures, making it difficult to analyze connected speech in clinical practice. The purposes of this study were to compare the differences of perturbation and cepstral measures based on auditory-perceptual severity and to identify useful acoustic indices for determining dysphonia severity, which is highly correlated with audi-tory-perceptual severity of both sustained vowels and connected speech.
Methods: Perturbation and cepstral analyses were performed with /a/ vowel prolongation and connected speech voice samples. Samples of a sustained vowel /a/ and connected speech productions were elicited from 147 patients (55 males and 92 females) with dysphonia. ‘G’ in GRBAS (grade, roughness, breathiness, asthenia, and strain) scale, the dysphonia severity was rated by two certified speech-language pathologists. Three time-based analyses pa-rameters?jitter (%), shimmer (%), and noise-to-harmonic ratio (NHR)?in perturbation analysis and two frequency-based analyses parameters?low/high spectral ratio [L/H ra-tio], cepstral peak prominence [CPP]?in cepstral analysis were compared among different ‘G’ groups.
Results: Measures of jitter, shimmer, and NHR significantly increased with dysphonia severity, whereas measures of L/H ratio and CPP (dB) significantly decreased with dysphonia severity. With respect to CPP (dB), significant differences were found between the normal and mild severity group in both /a/ vowels and connected speech (p <.05), whereas no differences were observed between the normal and mild severity group in jitter, shimmer, NHR, and L/H ratio in /a/ vowels (p >.05).
Conclusion: With cepstral-based acoustic measures, CPP can be a useful acoustic index for differentiating dysphonia severity and is a feasible objective acoustic measure for evaluating voice quality in both sustained vowels and connected speech.
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KEYWORD
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Dysphonia, Cepstral analysis, Dysphonia severity, Voice sample
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