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J Korean Soc Laryngol Phoniatr Logop > Volume 26(2); 2015 > Article
Journal of The Korean Society of Laryngology, Phoniatrics and Logopedics 2015;26(2): 117-121.
발성장애 평가 시 /a/ 모음연장발성 및 문장검사의 켑스트럼 분석 비교
김태환, 최정임, 이상혁, 진성민
성균관대학교 의과대학 강북삼성병원 이비인후과학교실
Comparison of Vowel and Text-Based Cepstral Analysis in Dysphonia Evaluation
Tae Hwan Kim, Jeong Im Choi, Sang Hyuk Lee, Sung Min Jin
Department of Otorhinolaryngology-Head and Neck Surgery, Kangbuk Samsung Hospital, Sungkyunkwan University School of Medicine
ABSTRACT
Background : Cepstral analysis which is obtained from Fourier transformation of spectrum has been known to be effective indicator to analyze the voice disorder. To evaluate the voice disorder, phonation of sustained vowel /a/ sound or continuous speech have been used but the former was limited to capture hoarseness properly. This study is aimed to compare the effectiveness in analysis of cepstrum between the sustained vowel /a/ sound and continuous speech. Methods : From March 2012 to December 2014, total 72 patients was enrolled in this study, including 24 unilateral vocal cord palsy, vocal nodule and vocal polyp patients, respectively. The entire patient evaluated their voice quality by VHI (Voice Handicap Index) before and after treatment. Phonation of sustained vowel /a/ sample and continuous speech using the first sentence of autumn paragraph was subjected by cepstral analysis and compare the pre-treatment group and post-treatment group. Results : The measured values of pre and post treatment in CPP-a (cepstral peak prominence in /a/ vowel sound) was 13.80, 13.91 in vocal cord palsy, 16.62, 17.99 in vocal cord nodule, 14.19, 18.50 in vocal cord polyp respectively. Values of CPP-s (cepstral peak prominence in text-based speech) in pre and post treatment was 11.11, 12.09 in vocal cord palsy, 12.11, 14.09 in vocal cord nodule, 12.63, 14.17 in vocal cord polyp. All 72 patients showed subjective improvement in VHI after treatment. CPP-a showed statistical improvement only in vocal polyp group, but CPP-s showed statistical improvement in all three groups (p<0.05). Conclusion : In analysis of cepstrum, text-based analysis is more representative in voice disorder than vowel sound speech. So when the acoustic analysis of voice by cepstrum, both phonation of sustained vowel /a/ sound and text based speech should be performed to obtain more accurate result.
KEY WORDS: Cepstrum;Dysphonia;Acoustic analysis;Voice;
중심 단어: 켑스트럼;언어장애;음성분석;음성;
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