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Detection thresholds for isolated vowels.

D Kewley-Port1

  • 1Department of Speech and Hearing Sciences, Indiana University, Bloomington 47405.

The Journal of the Acoustical Society of America
|February 1, 1991
PubMed
Summary
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Detecting isolated vowels depends on their acoustic properties, with significant differences in detection thresholds observed. Excitation patterns help predict these variations in vowel detectability.

Area of Science:

  • Auditory perception
  • Speech processing
  • Psychoacoustics

Background:

  • Vowel perception is crucial for speech intelligibility.
  • Individual vowel characteristics can influence their detectability.
  • Understanding factors affecting vowel detection aids in speech technology development.

Purpose of the Study:

  • To investigate the detectability of isolated vowels across different talkers and durations.
  • To identify acoustic features that explain variations in vowel detection thresholds.
  • To model vowel detection using excitation patterns.

Main Methods:

  • Utilized synthetic and natural (male, female) vowels with durations from 20-160 ms.
  • Employed an adaptive-tracking paradigm with normal-hearing listeners to determine detection thresholds.

Related Experiment Videos

  • Analyzed vowel spectra using excitation patterns and compared them to detection levels.

    • Main Results:

    • Detection thresholds varied by up to 22 dB across 30 different vowels.
    • Thresholds decreased with increasing vowel duration, consistent with temporal integration.
    • Modeling excitation patterns provided the best prediction for variations in vowel detection thresholds.

    Conclusions:

    • Vowel detectability is influenced by intrinsic acoustic properties beyond audibility.
    • Excitation pattern analysis offers a promising approach to understanding differential vowel detection.
    • Findings contribute to a deeper understanding of auditory processing of speech sounds.