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Sound Source Localization Testing in Single-sided Deafness Following Bone Conduction Intervention
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Interior and exterior sound field control using two dimensional higher-order variable-directivity sources.

M A Poletti1, T D Abhayapala, P Samarasinghe

  • 1Industrial Research Ltd, PO Box 31-310, Lower Hutt, Wellington 5040, New Zealand. m.poletti@irl.cri.nz

The Journal of the Acoustical Society of America
|May 8, 2012
PubMed
Summary
This summary is machine-generated.

Using higher-order directivity loudspeakers significantly expands the bandwidth for spatial audio reproduction. This approach reduces the number of required loudspeakers, enhancing high-frequency performance and attenuating exterior sound fields.

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Area of Science:

  • Acoustics
  • Audio Engineering
  • Signal Processing

Background:

  • Spatial sound reproduction aims to create immersive audio experiences.
  • High-frequency reproduction demands numerous loudspeakers, posing practical limitations.

Purpose of the Study:

  • To investigate the use of higher-order directivity loudspeakers for improved spatial audio.
  • To determine the impact on bandwidth, loudspeaker count, and exterior sound fields.

Main Methods:

  • Theoretical analysis of loudspeaker directivity orders (Nth order).
  • Modeling of sound field reproduction with varying loudspeaker directivity.
  • Simulation of interior and exterior sound field characteristics.

Main Results:

  • Nth order directivity enables N times bandwidth expansion and exterior field attenuation.
  • Removing exterior cancellation constraints allows for approximately 2N times bandwidth increase.
  • Higher-order loudspeakers reduce unit count but increase individual unit complexity.

Conclusions:

  • Higher-order directivity loudspeakers offer a viable solution for extending spatial audio bandwidth.
  • This technology significantly reduces loudspeaker requirements, especially at high frequencies.
  • Trade-offs involve increased complexity per loudspeaker unit.