CPP Calculator (Cepstral Peak Prominence)
Cepstral Peak Prominence (CPP) is one of the most robust single acoustic markers of voice quality. It quantifies the prominence of the cepstral peak corresponding to the fundamental period, and decreases as voice becomes more dysphonic or breathy. CPP can be measured on both sustained vowels and connected speech.
Open the CPP Calculator →Why CPP matters
Unlike perturbation measures (jitter/shimmer), CPP does not require reliable cycle-to-cycle period extraction, which makes it usable even on moderately to severely disordered voices. It is frequently reported as CPP or smoothed CPPS in clinical voice research.
How to measure CPP with Vocametrix
Upload or record a sample, and the tool returns the CPP value automatically. Track it over time to document change across a course of voice therapy, and export the value into your report.
Frequently asked questions
What is a good CPP value?
Higher CPP generally indicates better voice quality, while lower values are associated with breathiness and dysphonia. Exact cut-offs depend on the recording protocol and the smoothing used, so interpret alongside clinical findings.
Can I measure CPP without Praat?
Yes. Vocametrix computes CPP for you online, with no Praat installation or scripting.