Effects of Hoarseness on Ratings of Hypernasality-Source-Filter-Theory Approach-

DOI 1 Citations 26 References Open Access
  • Imatomi Setsuko
    Phonetics Laboratory, Sophia University Department of Children's Development and Human Health, Saitama Children's Medical Center
  • Arai Takayuki
    Department of Electrical and Electronics Engineering, Sophia University
  • Kato Masako
    Department of Plastic and Reconstructive Surgery, Showa University

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Other Title
  • 開鼻声の聴覚判定におけるさ声の影響－音源フィルタ理論による検討－
  • —Source-Filter-Theory Approach—
  • ―音源フィルタ理論による検討―

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The effects of hoarseness on ratings of hypernasality were examined by the perceptual experiment using synthesized stimuli. Twenty-four kinds of stimuli were synthesized by combining 6 sources (normal, moderate roughness, and severe roughness×2 (/a/, /i/) ), and 4 filters (severe hypernasality and normal×2 (/a/, /i/) ), based on source-filter theory. Four experienced speech pathologists rated the severity of hypernasality of the stimuli using a 5-point equal-appearing interval scale. Results revealed that severely rough voices were rated lower in hypernasality than normal or moderately rough voices, especially for severe hypernasal filters. Moderately rough voices were rated differently depending on kinds of filter. Acoustical analysis suggested that some spectral changes to the stimuli caused by roughness result in changes in perceived hypernasality. Clinical issues pertaining to these follow-up investigations are discussed, and future works are suggested.

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