嗄声の客観的評価に関して : 聴覚心理的評価と音響分析

概要

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As the degree of judged hoarseness increases, the noise component of the spectrogram increases and replaces the harmonic structure. The relationship between these two components has been quantified as harmonics-to-noise(H/N) ratio. In this study, the contribution of cycle-to-cycle pitch perturbations(jitter) to the measured noise energy was analyzed. Moreover, the relationship between the acoustic parameters(H/N ratio and jitter) and the perceived abnormalities of hoarseness was studied. Eight laryngologists rated their auditory impressions for G, R and B factors of 87 pathologic voices. G(Grade) represents the degree of hoarseness; R(Rough) refers to rumbling and heaviness; B(Breathy) is related to air leakage during phonation. Correlations of R factor with the H/N ratio or jitter were not so high as those of G or B factor with the H/N ratio(p<0. 05). These findings suggest that the H/N ratio can be a quantitative index of B factor as well as of G factor, and that neither of the acoustic parameters are good indicators of R factor.
社団法人日本音響学会の論文