학술논문
Usefulness of Cepstral Acoustic Index for Estimating Objective Dysphonia Severity
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- 영문명
- 발행기관
- 한국언어청각임상학회
- 저자명
- 유미옥(Miok Yu) 최성희(Seong Hee Choi) 최철희(Chul Hee Choi) 이경재(Kyungjae Lee)
- 간행물 정보
- 『Communication Sciences & Disorders』Communication Sciences & Disorders vol22. no.3, 587~596쪽, 전체 10쪽
- 주제분류
- 사회과학 > 교육학
- 파일형태
- 발행일자
- 2017.09.30
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국문 초록
배경 및 목적: CSL의 MDVP를 이용한 변동률 분석은 심각한 장애음질의 경우 분석 실패가 발생할 수 있고 연결발화를 분석하기에도 어려움이 있다. 이에 본 연구에서는 청지각적 중증도에 따른 각 집단의 변동률 분석과 캡스트럼 분석치를 비교하고 청지각적 중증도를 잘 변별하고 모음뿐 아니라 연결발화의 청지각적 중증도와 상관이 높은 음향 변수를 찾고자 한다. 방법: 본 연구는 총 147명을 대상으로 모음과 연결발화의 말표본을 사용하여 GRBAS의 ‘G’척도를 이용하여 청지각적 중증도를 각각 평정하였고 음향학적 분석으로는 변동률 분석치(%jitter, %shimmer, NHR), 캡스트럼 분석치(L/H ratio, CPP)를 측정하였다. 결과: 주파수변동률(%jitter), 진폭변동률(%shimmer), 소음대배음비(NHR), 저주파수대고주파수비(L/H ratio)는 음성평가 시 가장 민감하게 구분해야 하는 정상과 경도장애음성의 차이를 변별하지 못하였고, 심도의 장애음성에서는 분석실패가 2예 발생하였다. 모음과 연결발화의 캡스트럼측정치인 캡스트럼최고정점(CPP)은 청지각적 중증도에 따른 모든 집단을 변별할 수 있었으며 청지각적 중증도와도 높은 상관관계를 나타내었다. 논의 및 결론: 음성장애 환자의 음성을 평가할 때 장애음성의 중증도 변별에 캡스트럼 측정치인 캡스트럼최고정점(CPP)이 가장 유용한 음향지표가 될 수 있으며, 모음과 연결발화를 이용한 음성장애 환자의 음질 평가 시 객관적 음향학적 측정치로서 유용하게 사용될 수 있을 것이다.
영문 초록
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 auditory-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 parameters-jitter (%), shimmer (%), and noise-to-harmonic ratio (NHR)-in perturbation analysis and two frequency-based analyses parameters-low/high spectral ratio [L/H ratio], 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.
목차
Abstract
연구방법
연구결과
논의 및 결론
REFERENCE
국문초록
참고문헌
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