2020 Volume 61 Issue 1 Pages 18-30
Objective: To verify the reproducibility of cepstrum analysis in Japanese short-sentence reading and the validity of optimum short sentences for cepstrum analysis.
Participants: Sixty healthy Japanese adult native speakers (30 males and 30 females, mean age 22.7 years, SD 4.5 years).
Voice Samples and Analysis: Voice samples were recorded four times over two days. The sustained vowel /a/ and eight short sentences in Japanese were read at a conversational pitch and volume and recorded twice each day in a random order. Voice samples were digitized using a CSL Model 4300 (Kay-PENTAX). The recorded sustained vowels and sentences were analyzed using the Analysis of Dysphonia in Speech and Voice (ADSV) program (Kay-PENTAX) for cepstral peak prominence (CPP) and Cepstral/Spectral Index of Dysphonia (CSID).
Results: For short sentences, the intraclass correlation coefficients for CPP and CSID both indicated high within-subjects reliability.
Conclusion: CPP and CSID used in cepstrum analysis showed high test-retest reliability regardless of the type of sentence, providing evidence for the utility of both items.
