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Characteristics of voice quality on clear versus casual speech in individuals with Parkinson's disease

명료발화와 보통발화에서 파킨슨병환자 음성의 켑스트럼 및 스펙트럼 분석

  • 신희백 (한림대학교 보건과학대학원) ;
  • 심희정 (한림대학교 보건과학대학원) ;
  • 정훈 (구미대학교 언어재활과) ;
  • 고도흥 (한림대학교 언어청각학부)
  • Received : 2018.05.01
  • Accepted : 2018.06.12
  • Published : 2018.06.30

Abstract

The purpose of this study is to examine the acoustic characteristics of Parkinsonian speech, with respect to different utterance conditions, by employing acoustic/auditory-perceptual analysis. The subjects of the study were 15 patients (M=7, F=8) with Parkinson's disease who were asked to read out sentences under different utterance conditions (clear/casual). The sentences read out by each subject were recorded, and the recorded speech was subjected to cepstrum and spectrum analysis using Analysis of Dysphonia in Speech and Voice (ADSV). Additionally, auditory-perceptual evaluation of the recorded speech was conducted with respect to breathiness and loudness. Results indicate that in the case of clear speech, there was a statistically significant increase in the cepstral peak prominence (CPP), and a decrease in the L/H ratio SD (ratio of low to high frequency spectral energy SD) and CPP F0 SD values. In the auditory-perceptual evaluation, a decrease in breathiness and an increase in loudness were noted. Furthermore, CPP was found to be highly correlated to breathiness and loudness. This provides objective evidence of the immediate usefulness of clear speech intervention in improving the voice quality of Parkinsonian speech.

Keywords

References

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