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Design framework for spherical microphone and loudspeaker arrays in a multiple-input multiple-output system.

Hai Morgenstern1, Boaz Rafaely1, Markus Noisternig2

  • 1Department of Electrical and Computer Engineering, Ben Gurion University of the Negev, Beer- Sheva, 84105, Israel.

The Journal of the Acoustical Society of America
|April 5, 2017
PubMed
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This study introduces a design framework for multiple-input multiple-output (MIMO) systems using spherical microphone arrays (SMAs) and spherical loudspeaker arrays (SLAs). A matched design ensures superior performance in room acoustics by aligning array operating frequency ranges.

Area of Science:

  • Acoustics
  • Signal Processing
  • Array Design

Background:

  • Spherical microphone arrays (SMAs) and spherical loudspeaker arrays (SLAs) enable 3D room acoustics analysis.
  • Multiple-input multiple-output (MIMO) systems combine SMAs and SLAs for enhanced spatial diversity.
  • Existing design frameworks for SMAs and SLAs lack joint design considerations for MIMO systems.

Purpose of the Study:

  • To develop a comprehensive design framework for MIMO systems integrating SMAs and SLAs.
  • To incorporate error analysis and define error bounds for joint SMA and SLA system design.
  • To investigate the impact of array parameters on error bounds and system performance.

Main Methods:

  • A novel model is developed to address errors in MIMO systems comprising SMAs and SLAs.

Related Experiment Videos

  • Errors are incorporated separately for each array under a free-field assumption, defining error bounds.
  • The dependency of error bounds on SMA and SLA parameters is analyzed.

    • Main Results:

    • The study highlights the critical importance of a matched design for MIMO systems.
    • Parameter selection is recommended to ensure matched operating frequency ranges (OFRs) for SMAs and SLAs.
    • A design example demonstrates the superior performance of matched systems in synthesizing directional room impulse responses.

    Conclusions:

    • A matched design framework is essential for optimizing MIMO system performance in room acoustics.
    • Ensuring matched OFRs for SMAs and SLAs is crucial for effective joint system design.
    • The proposed framework facilitates robust error analysis and improved directional room impulse response synthesis.