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Related Experiment Videos

Acoustic correlates of hypernasality.

Alice S Y Lee1, Valter Ciocca, Tara L Whitehill

  • 1Division of Speech and Hearing Sciences, University of Hong Kong, Hong Kong. asylee@hkusua.hku.hk

Clinical Linguistics & Phonetics
|August 30, 2003
PubMed
Summary
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This study found that one-third-octave analysis reliably measures hypernasality in adults. Speakers with hypernasality showed distinct acoustic patterns in specific frequency bands compared to controls.

Area of Science:

  • Speech-language pathology
  • Acoustic phonetics
  • Audiology

Background:

  • Hypernasality, a speech disorder affecting resonance, can result from various conditions like dysarthria, maxillectomy, and cleft palate.
  • Accurate acoustic measurement of hypernasality is crucial for diagnosis and treatment evaluation.

Purpose of the Study:

  • To evaluate the utility of one-third-octave analysis in identifying acoustic correlates of hypernasality in adults.
  • To assess the reliability of this method across different etiological groups.

Main Methods:

  • One-third-octave spectral analysis was applied to the vowel /i/ from Cantonese words.
  • Speech samples from 12 adults with hypernasality and 12 normal controls were analyzed.
  • Acoustic parameters in specific frequency bands were compared between groups.

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Main Results:

  • Speakers with hypernasality exhibited significantly higher energy in one-third-octave bands centered at 630, 800, and 1000 Hz.
  • A significantly lower amplitude was observed in the band centered at 2500 Hz for hypernasal speakers.
  • These findings align with previous research on vowel nasalization.

Conclusions:

  • One-third-octave analysis is a reliable and applicable method for measuring acoustic features of hypernasality.
  • The technique demonstrates effectiveness across diverse etiologies of hypernasality in adults.
  • This acoustic analysis provides a valuable tool for understanding and managing hypernasality.