[Average spectral analysis of the voice. A comparison between the normal voice and the voice altered by various categories of laryngeal pathology].

Long-time spectral analysis shows a highly significant difference between a sample of normal voices, a sample of voices of nodule- and polyp-carriers, and a sample of voices of small malignant lesion-carriers. Schematically, pathologic voices due to lesions of the vocal folds have a relative excess of noise in the high part of the spectrum (6-10 kHz), but, in cases of small malignancy, this high-frequency noise also extends to the region 4-6 kHz. No clear difference appears between spectra of voices from nodule-carriers and voices of polyp-carriers. A standardized, phonetically selected text, seems to improve the discrimination power.