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An Automated System for Sound Localization Testing in Hearing-Impaired Listeners
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Sound source localization identification accuracy: bandwidth dependencies.

William A Yost1, Xuan Zhong1

  • 1Speech and Hearing Science, Arizona State University, P.O. Box 870102, Tempe, Arizona 85287.

The Journal of the Acoustical Society of America
|November 7, 2014
PubMed
Summary
This summary is machine-generated.

Wider sound stimuli improve sound source localization accuracy, with wideband noises yielding the best results. Localization accuracy for narrow bands and tones depends on frequency, favoring lower frequencies.

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Area of Science:

  • Auditory Perception
  • Acoustic Signal Processing

Background:

  • Sound source localization is crucial for auditory perception.
  • Understanding factors influencing localization accuracy is vital for audiology and acoustics research.

Purpose of the Study:

  • To investigate how stimulus bandwidth and center frequency affect sound source localization accuracy.
  • To determine optimal conditions for precise sound source identification.

Main Methods:

  • Measured root-mean-square (rms) error in degrees for sound source identification.
  • Varied stimulus bandwidth (1/20 to 2 octaves) and center frequency (250, 2000, 4000 Hz) of noise bursts and tones.
  • Assessed localization in the front, right quarter of the azimuth plane.

Main Results:

  • Increased stimulus bandwidth significantly improved localization accuracy (decreased rms error).
  • Wideband stimuli (>1 octave) resulted in the best accuracy (~6°-7° rms error), independent of center frequency.
  • Narrow bandwidths (<1 octave) and tonal stimuli showed frequency-dependent accuracy, with lower frequencies (250 Hz) performing best.

Conclusions:

  • Stimulus bandwidth is a primary determinant of sound source localization accuracy.
  • Wideband auditory signals facilitate more precise sound source identification.
  • Frequency plays a significant role in localization accuracy for narrowband and tonal stimuli.