Índice de perturbación, de precisión vocal y de grado de aprovechamiento de energía para la evaluación del riesgo vocal

The perturbation index is calculated on the basis of the partial scores along a diagonal line ranging from normal at one end to altered measurements at the other. The precision index is represented as a formant plot - normalized to fundamental frequency - which shows the contributions of both formant one and formant two to the precision index. To verify energy management at the vocal tract, formant bandwidths are measured and their inverse is drawn as points along a non-contribution/contribution line. The teachers' voices were automatically classified in three groups: normal, at risk and altered, all of which were successfully compared with their laryngologist's diagnosis. The method employed is a promising application for vocal risk evaluation.