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Formant discrimination in noise for isolated vowels
1Department of Speech and Hearing Sciences, Indiana University, Bloomington, Indiana 47405, USA. chang.liu@wichita.edu
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.
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.
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