An iOS-based Cepstral Peak Prominence Application: Feasibility for Patient Practice of Resonant Voice.

Objectives/hypothesis: Patients participating in voice therapy often express difficulty replicating therapy targets during their independent home practice. To assist patients, an iOS-based app was developed that calculates and displays cepstral peak prominence (CPP) values for patient self-monitoring of voice quality. The purpose of this study was to investigate the usability (ie ease of use) and utility (ie helpfulness) of this app in patient practice of resonant voice, and its effect on self-efficacy for practice.