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Evaluation of a method of simulating reduced frequency selectivity.

B C Moore1, B R Glasberg, A Simpson

  • 1Department of Experimental Psychology, University of Cambridge, Downing Street, CB23EB England.

The Journal of the Acoustical Society of America
|June 1, 1992
PubMed
Summary

This study evaluated a method for simulating hearing impairment using spectral smearing. The simulation accurately predicted auditory filter shapes, with some discrepancies attributed to individual hearing variations and data processing.

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Area of Science:

  • Auditory Neuroscience
  • Psychoacoustics
  • Signal Processing

Background:

  • Reduced frequency selectivity is a hallmark of hearing impairment.
  • Simulating auditory filter shapes is crucial for understanding hearing loss.
  • Spectral smearing offers a potential method for simulating impaired hearing.

Purpose of the Study:

  • To evaluate the accuracy of a spectral smearing method for simulating reduced frequency selectivity.
  • To compare derived auditory filter shapes with simulated ones.
  • To identify factors contributing to discrepancies in the simulation.

Main Methods:

  • Estimated excitation patterns for impaired ears.
  • Calculated spectral smearing needed to replicate patterns in normal ears.

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  • Used simulated broad auditory filters (symmetric and asymmetric).
  • Processed stimuli (notched noise, tones in noise) and conducted experiments with normally hearing subjects.
  • Measured tone-in-noise detection thresholds to derive auditory filter shapes.

    • Main Results:

    • Derived auditory filter shapes generally matched expected shapes based on simulated smearing.
    • Systematic discrepancies and individual differences were observed.
    • Discrepancies were independent of phase locking and outer/middle ear transmission characteristics.
    • Subject's own auditory filter sharpness and cross-filter information processing likely contributed to discrepancies.

    Conclusions:

    • The spectral smearing method is a reasonably accurate tool for simulating reduced frequency selectivity.
    • Discrepancies may arise from individual auditory filter characteristics and multi-filter processing by subjects.
    • The simulation's effectiveness is enhanced when based on symmetric auditory filters.