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Related Experiment Videos

Auditory filter shapes at low center frequencies.

B C Moore1, R W Peters, B R Glasberg

  • 1Department of Experimental Psychology, University of Cambridge, England.

The Journal of the Acoustical Society of America
|July 1, 1990
PubMed
Summary

Auditory filters in humans are asymmetric, with steeper upper slopes, especially at higher noise levels. Equivalent rectangular bandwidths increase with signal frequency, and lower frequencies require better signal-to-masker ratios for detection.

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Area of Science:

  • Auditory perception
  • Psychoacoustics
  • Hearing science

Background:

  • Understanding auditory filter characteristics is crucial for explaining human sound perception.
  • Previous research has utilized the notched-noise method to probe auditory filter shapes.

Purpose of the Study:

  • To estimate auditory-filter shapes in normally hearing individuals across various signal frequencies.
  • To investigate the asymmetry of auditory filters and its dependence on noise level.
  • To determine the equivalent rectangular bandwidths (ERBs) and their relation to signal frequency.

Main Methods:

  • Employed the notched-noise method with signal frequencies (fs) of 100, 200, 400, and 800 Hz.
  • Used two noise bands (0.4fs wide) placed symmetrically and asymmetrically around the signal frequency.

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  • Accounted for earphone frequency response and middle ear attenuation in filter shape derivation.
  • Measured auditory filter characteristics at two overall noise levels (77 and 87 dB SPL).

    • Main Results:

    • Auditory filters exhibited asymmetry, with the upper skirt being steeper than the lower skirt.
    • This asymmetry increased at the higher noise level (87 dB SPL).
    • Average ERBs at 77 dB SPL were 36, 47, 87, and 147 Hz for 100, 200, 400, and 800 Hz, respectively.
    • The signal-to-masker ratio needed for threshold detection increased significantly as signal frequency decreased.

    Conclusions:

    • Human auditory filters are inherently asymmetric, a characteristic that is more pronounced at higher sound intensities.
    • The ERB of auditory filters increases with signal frequency, indicating broader filtering at higher frequencies.
    • Lower signal frequencies necessitate a higher signal-to-masker ratio for perception, highlighting frequency-dependent sensitivity.