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Perception of across-frequency interaural level differences.

Tom Francart1, Jan Wouters

  • 1Exp ORL, Dept. Neurosciences, Katholieke Universiteit Leuven, O&N2, Herestraat 49 Bus 721, B-3000 Leuven, Belgium. tom.francart@med.kuleuven.be

The Journal of the Acoustical Society of America
|January 15, 2008
PubMed
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The study found that just noticeable differences (JND) in interaural level difference (ILD) increase with frequency shifts between ears. However, these JNDs remain usable for sound localization, impacting hearing aid technology.

Area of Science:

  • Auditory perception
  • Psychoacoustics
  • Acoustic signal processing

Background:

  • The interaural level difference (ILD) is a critical auditory cue for sound source localization.
  • Understanding the limits of ILD perception is essential for developing effective hearing technologies.

Purpose of the Study:

  • To measure just noticeable differences (JND) in ILD.
  • To investigate the effect of frequency shifts between ears on ILD JNDs.
  • To assess the implications for hearing instrument signal processing and fitting.

Main Methods:

  • Measured ILD JNDs in 12 normal-hearing subjects.
  • Used uncorrelated noise bands with a 1/3 octave bandwidth.
  • Varied center frequencies (250-4000 Hz) and interaural frequency shifts (0, 1/16, 1/3, 1 octave).

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Main Results:

  • JNDs for unshifted bands were 1.4-2.6 dB, decreasing with increasing frequency.
  • JNDs significantly increased with larger frequency shifts (0.5-1.5 dB worsening).
  • Perceived ILDs remained within a usable range for lateralization even with frequency shifts.

Conclusions:

  • Increasing frequency shifts between ears impair the precision of ILD perception.
  • Despite performance degradation, ILD remains a viable cue for sound localization in shifted-frequency conditions.
  • Findings inform signal processing for bilateral hearing instruments and cochlear implant fitting.