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An Automated System for Sound Localization Testing in Hearing-Impaired Listeners
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Acoustic contrast control in an arc-shaped area using a linear loudspeaker array.

Sipei Zhao1, Xiaojun Qiu1, Ian Burnett2

  • 1Key Lab of Modern Acoustics, Institute of Acoustics, Nanjing University, 22 Hankou Road Gulou District, Nanjing 210093, China.

The Journal of the Acoustical Society of America
|February 21, 2015
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Summary

This study introduces a novel method for acoustic contrast control in arc-shaped zones using linear loudspeaker arrays. The technique enhances sound field generation within the area, balancing uniformity and contrast effectively.

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Area of Science:

  • Acoustics
  • Signal Processing
  • Array Signal Processing

Background:

  • Controlling sound fields in specific spatial regions is crucial for applications like immersive audio and noise cancellation.
  • Existing methods for acoustic contrast control often lack flexibility in defining arbitrary target areas.
  • Linear loudspeaker arrays offer a promising platform for generating complex sound fields through signal manipulation.

Purpose of the Study:

  • To propose and evaluate a new method for acoustic contrast control within an arc-shaped area.
  • To demonstrate the capability of manipulating sound fields to create defined acoustic boundaries.
  • To investigate the trade-off between acoustic uniformity and acoustic contrast in the target area.

Main Methods:

  • Utilizing a linear loudspeaker array to generate a sound field.
  • Defining the arc-shaped area boundary by manipulating the phase profile of the loudspeakers.
  • Treating the boundary as the envelope of tangent lines formed by phase manipulation.
  • Comparing the proposed method with existing acoustic contrast control techniques.

Main Results:

  • The proposed method successfully generates a sound field within the specified arc-shaped area.
  • A trade-off relationship between acoustic uniformity and acoustic contrast was achieved.
  • Acoustic contrast increases with frequency, while acoustic uniformity decreases.

Conclusions:

  • The proposed phase manipulation technique effectively creates acoustic contrast control in arc-shaped areas.
  • This method offers enhanced control over sound field generation compared to existing approaches.
  • The frequency-dependent behavior of acoustic contrast and uniformity provides insights for practical implementation.