Using voice detection, our CPP cutoff value was 12.15 dB. We also implemented a voice detection process to select only the voiced segments of speech for analysis, as some programs use voice detection and others do not. We examined the the six CAPE-V sentences from 266 adults with and without voice disorders selected from the Perceptual Voice Qualities Database and found a cutoff CPP value of 9.52 dB. The current work in our lab replicated Murton and colleagues findings in Praat. Praat: (vowels) 14.45 dB Praat: (rainbow) 9.33 dB They found the following cutoffs to distinguish between controls and individuals with voice disorders:ĪDSV: (vowels) 11.46 dB ADSV: (rainbow) 6.11 dB Murton and colleagues (2020) also compared CPP values from ADSV and Praat on both vowels and a portion of the rainbow passage (also see Murton and Colleagues for excellent discussion on previous CPP studies). See Watts and colleagues (2017) for discussing of two popular programs used, ADSV and Praat. Although CPP offers a more ecologically valid measure of dysphonia that can be completed on running speech, it is important to acknowledge that differences in algorithm used to calculate CPP, stimuli used for analysis, and other person-related factors (e.g., fundamental frequency, sound pressure level) may impact CPP values. A lower CPP value is associated with a more dysphonic voice. Cepstral Peak Prominence (CPP) is an acoustic measure of dysphonia recommended by an ASHA expert panel.
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