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Characterising auditory filter nonlinearity

S Rosen1, R J Baker

  • 1Department of Phonetics and Linguistics, University College London, UK.

Hearing Research
|March 1, 1994
PubMed
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Auditory filters broaden with increasing sound levels. This study shows filter shape changes depend on probe sound level, not masker level, offering a simpler model for auditory processing.

Area of Science:

  • Auditory Neuroscience
  • Psychoacoustics
  • Signal Processing

Background:

  • Auditory filters broaden as sound levels increase, a key aspect of auditory nonlinearity.
  • The precise control mechanism (probe vs. masker level) for this filter broadening remains unclear.

Purpose of the Study:

  • To investigate whether auditory filter shape changes are primarily driven by probe or masker sound levels.
  • To develop and apply a novel method for fitting auditory filter shapes based on signal level.

Main Methods:

  • Developed a new fitting technique for auditory filter shapes using notched-noise data.
  • Explicitly modeled filter parameters as dependent on either probe or masker signal level.
  • Applied the technique to data from fixed-probe and fixed-masker paradigms across various levels.

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Main Results:

  • Models where filter parameters depend on probe level were significantly more successful than those dependent on masker level.
  • Successfully described nonlinear auditory filter shape changes at 2 kHz using only five parameters.
  • Demonstrated the implications for excitation pattern generation and computational auditory models.

Conclusions:

  • Auditory filter broadening is primarily controlled by the probe sound level.
  • This finding simplifies the understanding of nonlinear auditory filter dynamics.
  • The results facilitate the development of more realistic computational models of auditory processing.