Ratio S/Z

Ratio S/Z is an app designed by Andreu Sauca, an experienced speech therapist and phoniatrician. It has been conceived as a tool for the evaluation and the monitoring of voice rehabilitation. Purpose: The app registers the maximum expiration and phonation time and the calculation of the phonation quotient (or ratio S/Z) by using the highest of the three values in each. The ratio S/Z test is a crucial part in every protocol of voice exploration. There might be different professional purposes f