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Cepstral Peak Prominence Values for Clinical Voice Evaluation
Olivia Murton1,2, Robert Hillman1,2,3,4, Daryush Mehta1,2,3,4
1Speech and Hearing Bioscience and Technology, Division of Medical Sciences, Harvard Medical School, Boston, MA.
American Journal of Speech-Language Pathology
|July 14, 2020
Summary
Cepstral Peak Prominence (CPP) values were identified to distinguish voice disorders with high accuracy. These CPP values can aid clinicians in evaluating voice quality and dysphonia severity.
Area of Science:
- Speech and Hearing Sciences
- Acoustic Analysis
- Clinical Voice Assessment
Background:
- Cepstral Peak Prominence (CPP) is a quantitative measure used in voice analysis.
- Establishing normative CPP values is crucial for reliable clinical voice evaluation.
- Previous research has explored CPP, but specific cutoffs for distinguishing voice disorders and correlating with perceptual ratings require further definition.
Purpose of the Study:
- To identify specific Cepstral Peak Prominence (CPP) values using common analysis tools (ADSV and Praat) that can differentiate between speakers with and without voice disorders.
- To explore the potential of CPP values in estimating auditory-perceptual ratings of overall dysphonia severity.
Main Methods:
- Cepstral Peak Prominence (CPP) was computed using the Analysis of Dysphonia in Speech and Voice (ADSV) program and Praat.
- Experiment 1 involved 295 patients with voice disorders and 50 healthy controls producing sustained /a/ vowels and the Rainbow Passage.
- Experiment 2 analyzed recordings from 32 speakers with varying dysphonia severity, correlating CPP with listener ratings using linear regression.
Main Results:
- CPP cutoff values were identified to distinguish between disordered and healthy voices with up to 94.5% accuracy for sustained /a/ vowels and the Rainbow Passage.
- Specific cutoffs were 11.46 dB (ADSV) and 14.45 dB (Praat) for sustained /a/, and 6.11 dB (ADSV) and 9.33 dB (Praat) for the Rainbow Passage.
- CPP values demonstrated a correlation with auditory-perceptual ratings of dysphonia severity, with an R-squared value up to .74 in Experiment 2.
Conclusions:
- The identified CPP cutoff values serve as normative references for clinical voice evaluation using sustained /a/ vowels and the Rainbow Passage.
- These CPP values can assist clinicians in identifying the presence of voice disorders.
- The study provides a preliminary framework for using CPP to predict perceived dysphonia severity, aiding in objective voice assessment.
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