Acoustic measurements of the glottal source of normal male voices.

Background: acoustic vocal characteristics of young male adults.

Aim: to characterize the acoustic measurements of the glottal source of young male adults with normal voices and larynx and to compare these results to the standard measurements proposed by the software used for this assessment.

Method: 25 young male individuals (20 to 40 years), who presented normal voices and larynx, were selected. All subjects had the prolonged vowel [a] emission analyzed by the Multi Dimensional Voice Program Advanced (MDVPA). The Lilliefords test, with a significance level of 5%, was used to verify the normal distribution of the results of each measurement. The parameters with normal distribution had their means compared to the standard measurements proposed by the program using the T Test (significance level of 5%).

Results: the group was characterized by 18 means of acoustic measurements. Measurements of frequency disturbance and amplitude were the ones that most differed from the standard measurements, presenting higher values. Approximately half of the measurements presented normal distribution.

Conclusions: the measurements of jitter and shimmer of young male adults with normal voices and larynx were high. Measurements of fundamental frequency, noise and instability remained within the expected values. Approximately half of the measurements presented normal distribution prevailing those of jitter and shimmer, indicating that these measurements can be used as a reference.