Abstract
The smoothed cepstral peak prominence (CPPS) is an acoustic measure that can be calculated in both sustained vowels and continuous speech. The goal of this work is to find out the diagnostic accuracy of CPPS in the detection of dysphonia in Spanish.
 In this study 136 subjects with dysphonia and 47 healthy subjects participated. For each subject a sustained vowel and the reading of three phonetically balanced sentences were recorded. The CPPS was calculated with Praat using its default configuration (configuration 1), and also with the one used in the calculation of the Acoustic Voice Quality Index (configuration 2). Five experts perceptively assessed the voice of the subjects in the sample by means of the GRABS scale.
 The CPPS has a great power of discrimination between the normal and the pathological voice, whether it is calculated from the sustained vowel /a/ (AROC[config. 1] = 0.863 and AROC[config. 2] = 0.841) or whether it is calculated from the sentences (AROC[config. 1] = 0.884 and AROC[config. 2] = 0.866).
 The results confirm that CPPS is a valid acoustic measurement to detect dysphonia in the Spanish language.
Highlights
The results confirm that CPPS is a valid acoustic measurement to detect dysphonia in the Spanish language
The goal of this work is to find out the diagnostic accuracy of CPPS in the detection of dysphonia in Spanish
The CPPS was calculated with Praat using its default configuration, and with the one used in the calculation of the Acoustic Voice Quality Index
Summary
El análisis acústico nos aporta información objetiva sobre la voz del paciente de manera no invasiva. Con relación al tipo de muestra de voz, el análisis cepstral se puede utilizar tanto con vocales sostenidas como con habla continua, aportando validez ecológica a la evaluación acústica (Delgado-Hernández et al, 2018). El CPPS es una medida acústica cepstral que representa la diferencia entre el pico cepstral más prominente, o primer rahmonic, y el punto con la misma quefrency sobre la línea de regresión a través del cepstrum suavizado (Figura 1). Los estudios realizados hasta el momento muestran su utilidad tanto en el diagnóstico de las alteraciones de la voz (Heman-Ackah et al, 2014; Sauder, Bretl y Eadie, 2017) como en la evaluación de la severidad de la disfonía Para ello se estudiarán los valores del CPPS obtenidos a través de vocales sostenidas y frases, así como diferentes configuraciones para el cálculo de esta medida en Praat
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