한국인 화자에서 새로운 버전의 Acoustic Voice Quality Index 적용 = Application of the New Version of the Acoustic Voice Quality Index with Korean Speakers

국문 초록 (Abstract)

배경 및 목적: 본 연구에서는 한국인 화자에서 정상음성과 병리적 음성을 정량화하는 Acoustic Voice Quality Index (AVQI)의 새로운 회귀식을 제시하여 기존의 회귀식(AVQIv2, AVQIv3)과 비교하고자 하였다. 또한 AVQI 측정치와 청지각적 평가 간의 상관관계도 알아 보고, 정상과 병리적 음성을 감별할 수 있는 최적의 절사값 및 진단 예측력도 알아보았다. 방법: 한국인 화자 2,369명으로부터 모음연장 발성 /아/ 5초와 표준문단 ‘산책’ 읽기를 통해서 녹음하였다. 모음의 안정구간 2초와 읽기샘플 25음절을 연결하여 Praat 스크립트를 적용하여 유성음 분절을 추출하고 AVQI를 측정하였다. 또한 음성장애의 중증도를 평가하기 위해서, 5명의 언어재활사가 두 가지 청지각적 평가(GRBAS의 Grade척도, CAPE-V의 overall severity 척도)를 사용하였다. 결과: 전체 AVQI 측정치는 AVQIv2, AVQIv4-K, AVQIv3 순으로 높았으며, AVQIv3는 나머지 AVQI 측정치들에 비해서 유의미하게 낮았다. 각 버전 모두 정상과 병리적 음성 집단 간에 유의 미한 차이를 보였다. AVQI와 청지각적 평가 간에는 .82 이상의 높은 상관관계를 보였고, AVQIv4-K와 상관관계가 가장 높았다. ROC 분석을 통해서 모든 AVQI는 모두 .94 이상의 AUC, 9.5 이상의 LR(+), .2 이하의 LR(-)를 나타내었다. 논의 및 결론: AVQIv4-K는 기존 AVQI 버전에 상응하는 높은 수준의 진단적 성능을 가지는 것으로 여겨진다.

다국어 초록 (Multilingual Abstract)

Objectives: The purpose of the present study was to compute the new version of Acoustic Voice Quality Index (AVQI) and compare with existing AVQI versions. Additionally, we also investigated the correlation between AVQI measurements and auditory-perceptual ratings, and confirmed the optimal cutoff value and diagnostic predictive power to distinguish between normal and pathological voice. Methods: Voice samples of 2,369 native Korean subjects with normal voices (N= 143) and with dysphonia (N= 2,226) were recorded through both 5 seconds of sustained vowel /a/ and connected speech (Korean text “Walk”). We used the Praat script to extract the voiced segments and measure the AVQI. Additionally, two auditory-perceptual ratings (grade in GRBAS and overall severity in CAPE-V) were used by five speech language pathologists to assess the voice disorder severity. Results: Overall AVQI measurements were higher in order of AVQIv2, AVQIv4-K and AVQIv3; and AVQIv3 was significantly lower than other AVQI measures. In each version, there was a significant difference between normal and pathological voice groups. The correlation between AVQI and auditory evaluation was above .82, and the correlation with AVQIv4-K was the highest. All versions of the AVQI showed an above .94 for AUC, above 9.5 for LR(+), and below .2 for LR(–). Conclusion: AVQIv4-K is considered to have a high level of diagnostic power comparable to the existing AVQI versions.

목차 (Table of Contents)

• 연구방법 연구결과 논의 및 결론

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