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Formant discrimination in noise for isolated vowels.

Chang Liu1, Diane Kewley-Port

  • 1Department of Speech and Hearing Sciences, Indiana University, Bloomington, Indiana 47405, USA. chang.liu@wichita.edu

The Journal of the Acoustical Society of America
|December 18, 2004
PubMed
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Understanding vowel formant discrimination in noise is crucial for hearing aid development. Noise type and signal-to-noise ratio significantly impact the ability to distinguish vowel sounds, with speech-shaped noise being a more effective masker than multitalker babble.

Area of Science:

  • Audiology
  • Speech Perception
  • Psychoacoustics

Background:

  • Vowel formant discrimination is essential for speech intelligibility.
  • Understanding how noise affects formant perception is key to improving assistive listening devices.

Purpose of the Study:

  • To investigate vowel formant discrimination in normal-hearing listeners under various noise conditions.
  • To determine the effects of signal-to-noise ratio (SNR) and noise type on the perception of American English vowels.

Main Methods:

  • Measured discrimination thresholds for F1 and F2 of seven American English vowels.
  • Tested conditions included quiet, long-term speech-shaped noise (LTSS), and multitalker babble.
  • Signal-to-noise ratios (SNR) ranged from -4 dB to +4 dB.

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Main Results:

  • Formant frequency, SNR, and noise type significantly affected vowel discrimination.
  • Thresholds were elevated by approximately 3 dB in low SNR conditions compared to quiet.
  • Masking functions were well-described by a negative exponential model for both noise types.

Conclusions:

  • Speech-shaped noise was a slightly more effective masker than multitalker babble.
  • Temporal variations in multitalker babble may offer a slight benefit in masking.
  • Findings provide insights into auditory processing of vowels in noise.