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Related Experiment Videos

The masking-level difference in low-noise noise

J W Hall1, J H Grose, W M Hartmann

  • 1Division of Otolaryngology/Head & Neck Surgery, University of North Carolina Medical School, Chapel Hill 27599-7070, USA.

The Journal of the Acoustical Society of America
|May 30, 1998
PubMed
Summary

Masker fluctuation impacts auditory detection. While lower fluctuation aids NoSo detection, higher fluctuation can sometimes improve NoS pi detection, suggesting complex binaural processing in fluctuating noise.

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Area of Science:

  • Auditory Neuroscience
  • Psychoacoustics
  • Signal Processing

Background:

  • Masker fluctuation significantly influences auditory detection thresholds.
  • Previous research indicates lower thresholds in low-fluctuation noise for certain conditions.

Purpose of the Study:

  • To investigate the effect of masker fluctuation on binaural detection thresholds (NoSo and NoS pi).
  • To determine if masker fluctuation consistently affects NoSo and NoS pi detection or if results are subject-dependent.

Main Methods:

  • Experiment 1: Measured NoSo and NoS pi thresholds for a pure tone in low- and high-fluctuation masking noise (10 Hz bandwidth).
  • Experiment 2: Varied masker fluctuation by adjusting modulation depth of a pure-tone masker, using a noise signal.

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Main Results:

  • NoSo thresholds were lower in low-fluctuation noise, consistent with prior studies.
  • NoS pi thresholds showed subject-dependent results: some listeners had similar thresholds, while others had higher thresholds in low-fluctuation noise.
  • High masker fluctuation sometimes facilitated NoS pi detection.

Conclusions:

  • Masker fluctuation has differential effects on NoSo and NoS pi detection.
  • Subject variability exists in binaural detection within fluctuating maskers.
  • Binaural detection may exploit low signal-to-noise ratio periods in fluctuating maskers.