Abstract
There have been various indices obtained by acoustic voice analyses for objective evaluation of hoarseness. It is desirable to obtain easily indices of hoarseness which contain as many characteristics of pathological voices as possible. The cepstrum analysis has been applied recently and appears to be one of such indices. The height of the dominant cepstral peak (C1) is known to vary in relation to period and amplitude perturbation (PPQ, APQ) of pathological voices. In this study, relationships between C1 and PPQ, APQ were investigated for synthetic voices and normal and pathological human voices. In the study using synthetic voices, C1 decreased as PPQ increased.
APQ, however, was not markedly related to C1. In the analysis of the acoustic speech signals which were obtained from 100 normal adults and 105 patients with various laryngeal diseases, both PPQ and APQ were related to C1. The results indicate that the cepstrum is useful for objective evaluation of hoarseness.
