Acoustic estimation of voice when incorrect resonance function of the nose takes place.

Phonation is a sensitive indicator of palatopharyngeal obstruction and its physiological force. The aim of the study was to evaluate the influence of nasality on the voice quality. The study was carried out on 125 patients divided into three subgroups. The first was created of the patients treated due to allergic rhinitis, the second was composed of patients with adenoids, the third one consisted of patients with cleft palate. The following acoustic parameters were assessed: Fo, Jitter, Shimmer, Fo-tremor, NNE, HNR, SNR. The results of the experimental and control groups were analysed statistically with Student's t-test. The performed acoustic tests of voice confirmed statistically significant elevation of Fo, HNR and SNR frequency in the studied group as compared with the control group.