Objective Evaluation of Phonation in the Normal and Pathological States
- VernacularTitle:正常与病态下嗓音的客观指标的评价
- Author:
Shuifang XIAO
;
Min GUO
;
Peiying] [ZHAO
- Publication Type:Journal Article
- Keywords:
Aerodynamics of larynx Pitch perturbation Vocal efficiency
- From:
Journal of Audiology and Speech Pathology
1997;0(04):-
- CountryChina
- Language:Chinese
-
Abstract:
Mean flow rate (MFR) ,vocal intensity (I) ,pitch frequency(P) ,pitch perturbation (PP) and vocal efficiency (I/F) were measured simutaneously during sustained phonation of the vowel [i] at wide range levels of intensities in 158 nor mal subjects and the same parameters were measured at moderate vocal intensity level in 136 patients with various kinds of laryngeal diseases. PP indicates the amount of irregular vibration of vocal folds and I/F represents efficient transition from MFR to acoustic energy. When phonation at different intensities ,MFR,P and I/F increase but PP decreases when I increases. At moderate intensity phonation, there are positive correlations between MFR and I,and between I and P but negative correlation between MFR and I/F,between I(male) and PP,and between P(fe-male) and PP.Most of the patients with laryngeal diseases showed higher MFR and PP but lower I/F than normal subjects.MFR, PP and I/F could be used as objective and quantitative parameters with I and P as reference parameters in assessing laryngeal function of phonation.
