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Related Experiment Videos

Image shift caused by strong lateral reflections, and its relation to inter-aural cross correlation

Okano1

  • 1Graduate School of Science and Technology, Kobe University, Nada, Japan.

The Journal of the Acoustical Society of America
|December 7, 2000
PubMed
Summary

This study investigated acoustical image shift, a phenomenon caused by sound reflections. Researchers identified specific frequency ranges and acoustic measures to prevent image shift in sound fields, crucial for concert hall acoustics.

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Area of Science:

  • Acoustics
  • Psychoacoustics
  • Architectural Acoustics

Background:

  • Image shift is an acoustical phenomenon caused by strong lateral reflections, leading to perception of multiple auditory images.
  • Understanding the conditions that cause image shift is crucial for designing optimal sound fields, particularly in performance spaces.

Purpose of the Study:

  • To investigate the conditions that lead to acoustical image shift.
  • To define frequency ranges and acoustic measures associated with different types of image shift.
  • To establish acceptable acoustic parameter ranges for concert halls to avoid image shift.

Main Methods:

  • Conducted listening tests using electrically reproduced sound fields.
  • Analyzed binaural impulse responses using the inter-aural cross correlation function (IACF).

Related Experiment Videos

  • Measured acoustic parameters in three existing concert halls.

    • Main Results:

    • Each of the three defined types of image shift was associated with a specific frequency range.
    • Image shift occurrence correlated with three measures derived from the IACF.
    • Acceptable ranges for these measures were suggested for frequencies of 500 Hz and above, with lower frequencies being less critical.

    Conclusions:

    • The study provides objective measures to evaluate and control acoustical image shift.
    • An upper limit of 0.85 for [1 - IACC(E3)] is proposed as a preferable range to maintain a single auditory image.
    • Findings are applicable to the acoustic design of concert halls and other performance venues.