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Spectral aliasing in an acoustic spectral ripple discrimination task
Jesse M Resnick1, David L Horn1, Anisha R Noble1
1Department of Otolaryngology-Head and Neck Surgery, University of Washington, Box 357923, Seattle, Washington 98195-7923, USA.
The Journal of the Acoustical Society of America
|March 2, 2020
Summary
Spectral ripple discrimination tasks can be affected by carrier density, leading to inaccurate results in normal-hearing listeners. This study highlights the importance of carrier density in spectral resolution testing for hearing research.
Area of Science:
- Auditory Neuroscience
- Psychoacoustics
- Hearing Science
Background:
- Spectral ripple discrimination tasks assess spectral resolution in various hearing groups.
- These tasks are vital for understanding auditory development in children with normal hearing and cochlear implants.
Purpose of the Study:
- To identify stimulus sine-wave carrier density as a critical variable in spectral ripple tasks.
- To demonstrate how insufficient carrier densities can compromise spectral resolution measurements.
Main Methods:
- Analysis of the Spectro-Temporally Modulated Ripple (SMR) Test.
- Investigating the impact of spectral under-sampling due to insufficient carrier densities.
Main Results:
- Insufficient carrier densities can eliminate ripple cues and introduce interference, creating non-monotonic psychometric functions.
- This effect can lead to systematic underestimation of thresholds in normal-hearing listeners using adaptive techniques.
- Cochlear implant users typically operate below the density regime where this aliasing occurs.
Conclusions:
- Carrier density is a crucial factor in spectral ripple discrimination tasks, impacting results in normal-hearing listeners.
- Careful consideration of spectral aliasing is necessary when designing tasks using modulated carriers to approximate spectral patterns.
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