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Horizontal directivity patterns differ between vowels extracted from running speech.

Paulina Kocon1, Brian B Monson1

  • 1Department of Speech and Hearing Science, University of Illinois at Urbana-Champaign, 901 South Sixth Street, Champaign, Illinois 61820, USA pkocon2@illinois.edu, monson@illinois.edu.

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Summary
This summary is machine-generated.

Vowel sounds like /ɑ/ show distinct directivity patterns from the human mouth, differing from general speech. This study reveals dynamic changes in sound radiation during speech production.

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Area of Science:

  • Acoustics
  • Speech Science
  • Bioacoustics

Background:

  • Directivity patterns of human vocalizations are well-studied.
  • Phoneme-specific variations in sound radiation from the mouth are not well understood.

Purpose of the Study:

  • To investigate phoneme-specific directivity patterns of vowels /ɑ/, /e/, /i/, /o/, /u/.
  • To compare directivity between individual vowels and long-term averaged speech.
  • To analyze dynamic changes in sound radiation during speech.

Main Methods:

  • Measured half-plane horizontal directivity up to 20 kHz with 15° angular resolution.
  • Extracted vowels from running speech.
  • Utilized angle-dependent third-octave band weighting functions.

Main Results:

  • Observed an effect of vowel category on the directivity index, with /ɑ/ exhibiting the highest directivity.
  • Highlighted disparities in directivity between running speech and individual vowels.
  • Demonstrated rapidly changing dynamic directivity patterns during speech.

Conclusions:

  • Vowel identity significantly influences the directivity of human vocalizations.
  • Dynamic directivity patterns are crucial for understanding speech acoustics.
  • Findings provide insights for simulating realistic listening conditions.