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Intensity resolution and loudness in high-pass noise

R S Schlauch1

  • 1University of Minnesota, Minneapolis 55455-0209.

The Journal of the Acoustical Society of America
|April 1, 1994
PubMed
Summary

High-pass noise minimally impacts intensity resolution and loudness growth below 40 dB SPL. Above this level, noise alters Weber's law adherence for intensity resolution and reduces perceived loudness.

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Area of Science:

  • Auditory perception
  • Psychoacoustics
  • Signal processing in hearing

Background:

  • Understanding how noise affects auditory perception is crucial for hearing aid design and noise reduction strategies.
  • Intensity resolution and loudness perception are fundamental aspects of auditory processing.

Purpose of the Study:

  • To investigate the effects of high-pass noise on intensity resolution and loudness growth for a 1000-Hz tone.
  • To determine how noise impacts auditory thresholds and perception at different sound pressure levels (SPL).

Main Methods:

  • Intensity resolution was measured using a three-interval forced-choice (3-IFC) adaptive procedure for gated and continuous tones.
  • Loudness matches were obtained via an adaptive, alternate binaural loudness balance procedure.
  • Three listening conditions were used: quiet, low-level high-pass noise (32 dB SPL), and high-level high-pass noise (42 dB SPL).

Main Results:

  • Below 40 dB SPL, high-pass noise had minimal effect on loudness growth and intensity resolution.
  • Above 40 dB SPL, intensity resolution for gated tones followed Weber's law, while continuous tones showed a 'near-miss'.
  • Just-noticeable differences (jnd's) for continuous tones were larger in noise than in quiet, and loudness was reduced in the presence of noise.

Conclusions:

  • High-pass noise primarily affects auditory perception at higher tonal levels.
  • Loudness perception is less influenced by excitation spread than intensity discrimination.
  • The findings provide insights into the complex interplay between noise, intensity resolution, and loudness perception.

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