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The Measurement of Unsteady Surface Pressure Using a Remote Microphone Probe
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Higher order differential-integral microphone arrays.

Thushara D Abhayapala1, Aastha Gupta

  • 1Applied Signal Processing Group, School of Engineering, College of Engineering and Computer Science, The Australian National University, Canberra ACT 0200, Australia. thushara.abhayapala@anu.edu.au

The Journal of the Acoustical Society of America
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Summary
This summary is machine-generated.

This study introduces novel higher-order directional microphone arrays. These designs leverage signal processing techniques for improved directional audio capture with existing sensor spacing.

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Area of Science:

  • Acoustics and Signal Processing
  • Array Signal Processing

Background:

  • Traditional directional microphone arrays, such as first and second-order differential arrays, have limitations in directional resolution.
  • Designing higher-order arrays often requires complex sensor configurations and increased spacing.

Purpose of the Study:

  • To develop theoretical foundations for designing higher-order directional microphone arrays.
  • To achieve enhanced directional microphone performance without altering traditional inter-sensor spacings.

Main Methods:

  • Utilizing the Jacobi-Anger expansion to analyze signals from closely spaced sensor pairs.
  • Processing the difference and sum of microphone signals to construct novel directional array configurations.

Main Results:

  • The proposed higher-order designs maintain similar inter-sensor spacings as conventional first and second-order arrays.
  • The theoretical framework enables the design of novel directional arrays exploiting signal properties.

Conclusions:

  • Higher-order directional microphone arrays can be designed effectively using signal processing on closely spaced sensors.
  • The Jacobi-Anger expansion provides a powerful tool for developing advanced microphone array systems.