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ARL Spectral Fitting as an Application to Augment Spectral Data via Franck-Condon Lineshape Analysis and Color Analysis
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Spectral weights for sample discrimination as a function of overall level.

Lori J Leibold1, Hongyang Tan, Walt Jesteadt

  • 1Boys Town National Research Hospital, Omaha, Nebraska 68131, USA. leibold@med.unc.edu

The Journal of the Acoustical Society of America
|January 29, 2009
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Summary

Overall sound level, not hearing loss, influences how listeners weigh spectral components. This study reveals that higher overall sound levels cause listeners to focus more on higher frequencies, impacting auditory perception.

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Area of Science:

  • Auditory Neuroscience
  • Psychoacoustics
  • Signal Processing

Background:

  • Previous research indicated hearing-impaired listeners prioritize spectral components near their hearing loss frequencies.
  • Weighting patterns for normal-hearing listeners in prior studies were variable.

Purpose of the Study:

  • To investigate the influence of overall sound level on spectral weighting in normal-hearing listeners.
  • To determine if overall sound level, sensation level, or degree of hearing loss primarily drives spectral weighting patterns.

Main Methods:

  • A six-tone complex (0.25-8 kHz octave frequencies) was presented to normal-hearing subjects in quiet and noise (high-pass and low-pass) at varying overall levels.
  • A second experiment involved seven subjects listening to the complex in quiet across four different mean levels.
  • Spectral weights assigned to individual frequency components were analyzed.

Main Results:

  • In high-pass noise, listeners weighted the 4-kHz component more heavily, consistent with previous findings.
  • In low-level quiet conditions, weights were distributed more evenly across components.
  • Weights for high-frequency components increased with increasing overall sound level in quiet conditions.

Conclusions:

  • Overall sound level, not the degree of hearing loss or sensation level, appears to be the dominant factor influencing spectral weighting.
  • Listener's focus on specific frequency regions is modulated by the overall intensity of the auditory stimulus.