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Intermodulation product pair 2f1 +/- fh: masking and growth
The Journal of the Acoustical Society of America
|November 1, 1977
Summary
The study investigated the unique production of the distortion product 2f1-fh. Findings suggest this distortion product and 2f1+fh share similar cochlear properties and masking behaviors.
Area of Science:
- Auditory neuroscience
- Nonlinear acoustics
- Psychoacoustics
Background:
- The auditory system exhibits nonlinear behavior, producing distortion products like 2f1-fh and 2f1+fh.
- The precise generation mechanism and perceptual relevance of these distortion products remain areas of active research.
Purpose of the Study:
- To determine if the distortion product 2f1-fh is produced by a unique nonlinear mechanism.
- To compare the properties and masking behaviors of 2f1-fh and 2f1+fh.
Main Methods:
- Estimating amplitudes of 2f1-fh and 2f1+fh in three listeners.
- Measuring threshold shifts using a tone-on-tone masking paradigm.
- Assessing the influence of stimulus fine-time structure on masking.
Main Results:
- Both 2f1-fh and 2f1+fh exhibit similar masking properties, suggesting a physical realization in the cochlea.
- Masking was independent of stimulus fine-time structure.
- The previously reported 1 dB/dB growth of 2f1-fh was not altered by making it inaudible.
Conclusions:
- The findings do not support a unique nonlinear mechanism for 2f1-fh production.
- Distortion products 2f1-fh and 2f1+fh likely share common cochlear processing pathways.
- Further investigation is needed to explain the differing growth rates of 2f1-fh and 2f1+fh.