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Continuously steerable second-order differential microphone arrays.

Joon Byun1, Young-Cheol Park1, Sung Wook Park2

  • 1Computer and Telecommunications Engineering Division, Yonsei University, Wonju-si, Gangwon-do 26493, South Korea.

The Journal of the Acoustical Society of America
|April 2, 2018
PubMed
Summary
This summary is machine-generated.

This study introduces a second-order differential microphone array (DMA) for continuous beam steering. The proposed system uses back-to-back cardioids, eliminating the need for phase shifters and offering practical advantages in microphone count.

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Area of Science:

  • Acoustics
  • Signal Processing
  • Array Signal Processing

Background:

  • Microphone arrays are crucial for directional sound capture and noise reduction.
  • Traditional beamforming often requires complex phase shifters for steering.
  • Second-order differential microphone arrays (DMAs) offer potential for enhanced directional sensitivity.

Purpose of the Study:

  • To propose a novel second-order differential microphone array (DMA) capable of continuous main lobe steering.
  • To investigate microphone configurations that enable phase-shifter-free beam pattern synthesis.
  • To evaluate the trade-offs between microphone count and performance in steerable DMAs.

Main Methods:

  • Derivation of the general response for a second-order DMA as a combination of monopole and dipole responses.
  • Proposal of nine- and seven-microphone configurations for continuous beam steering.
  • Utilizing back-to-back cardioid elements to synthesize steered beam patterns without phase shifters.

Main Results:

  • The nine-microphone configuration demonstrates a nearly constant and high white noise gain.
  • The seven-microphone configuration offers a practical advantage with a reduced microphone count.
  • Simulation results validate the continuous steering capability and beam pattern synthesis of the proposed DMAs.

Conclusions:

  • The proposed second-order DMA effectively achieves continuous beam steering without phase shifters.
  • Both nine- and seven-microphone systems are viable, with the latter offering a more practical solution due to fewer components.
  • The study contributes a novel approach to steerable microphone array design with implications for audio processing and acoustics.