Analysis of pathological voices with a sound spectrograph

摘要: Our previous study demonstrated that some acoustical parameters derived by a computer analysis of pathologic voices were useful to differentiate causative diseases extent [S. Hiki, S. Imaizumi, M. Hirano, and H. Matsushita, J. Acoust. Soc. Am. 58, S111(A) (1975)]. In this paper, possibility utilizing sound‐spectrograph for the same purpose was investigated. Voice materials used sustained vowels uttered patients polyp or nodule (42 cases), sulcus vocalis (20), recurrent laryngeal nerve paralysis (33) cancer (15), normal speakers (20). Acoustical parameters, which revealed be valuable in our study, such as degree fluctuation fundamental frequency amplitude, declination spectral envelope harmonic components, amount noise components various ranges measured from pattern, section amplitude display sound‐spectrograms. The results indicated sound‐spectrographic significant ...