Usefulness of Cepstral Acoustic Analysis

Abstract

Since cepstral analysis needs no detection of pitch within waveforms, it can evaluate connected speech contexts and severely disordered voice. The validity of CPP (cepstral peak prominence) and CSID (cepstral spectral index of dysphonia) has been investigated in several studies for various languages via correlation analysis between the acoustic measurements and perceptual evaluation as well as receiver operating characteristic curve analysis. Those studies have indicated that CPP and CSID are useful as indicators of dysphonia as well as indices of dysphonia severity. In addition, reliability assessment of CPP and CSID for severe disordered voice was performed by repeating the analysis for the same voice samples. The results showed that CPP and CSID were reliable even for severe disordered voices. Since cepstral acoustic measures were regarded as valid and reliable, it is desirable to utilize cepstral acoustic measures in clinical practice.