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Auditory filter shapes at high frequencies

B Zhou1

  • 1Psychology Department, University of Florida, Gainesville 32611-2065, USA.

The Journal of the Acoustical Society of America
|October 1, 1995
PubMed
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This study measured auditory filter shapes in normally hearing individuals using a notched-noise method. Results show auditory filter bandwidths align with established models, widening at higher noise levels.

Area of Science:

  • Audiology
  • Psychoacoustics
  • Auditory Perception

Background:

  • The auditory filter describes frequency selectivity in human hearing.
  • Understanding its shape, particularly at high frequencies, is crucial for audiological applications.
  • Previous research extrapolated auditory filter bandwidths, but direct measurements at high frequencies are less common.

Purpose of the Study:

  • To estimate the shape of the auditory filter at high center frequencies (4-16 kHz) in normally hearing listeners.
  • To compare measured auditory filter bandwidths with existing extrapolated models.
  • To investigate the effect of noise spectrum level on auditory filter shape at high frequencies.

Main Methods:

  • Utilized the notched-noise method to measure auditory filter shapes.

Related Experiment Videos

  • Employed a specialized sound delivery system for high-frequency masking noise (flat spectrum).
  • Tested at center frequencies of 4, 12, 14, and 16 kHz with noise spectrum levels of 40 dB and 50 dB.

    • Main Results:

    • Mean equivalent rectangular bandwidths (ERBs) at 4, 12, and 14 kHz closely matched extrapolations by Glasberg and Moore (1990).
    • At 16 kHz, the mean ERB aligned with the extrapolation by Moore and Glasberg (1983).
    • Auditory filters were wider at a higher noise spectrum level (50 dB vs. 40 dB) at 12 and 14 kHz, consistent with lower frequencies.

    Conclusions:

    • The auditory filter shape at high frequencies (up to 16 kHz) is well-described by existing models.
    • Increased masker intensity broadens the auditory filter, a phenomenon observed across different frequency regions.
    • These findings validate and extend current understanding of human auditory frequency resolution.