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On the design of differential beamformers with arbitrary planar microphone array geometry
Gongping Huang1, Jingdong Chen1, Jacob Benesty2
1Center of Intelligent Acoustics and Immersive Communications, Northwestern Polytechnical University, 127 Youyi West Road, Xi'an, Shaanxi 710072, China.
The Journal of the Acoustical Society of America
|August 5, 2018
Summary
This study presents a general algorithm for differential beamforming using microphone arrays of any planar shape. The method ensures frequency-invariant beampatterns for various array geometries, enabling flexible acoustic signal processing.
Area of Science:
- Acoustics
- Signal Processing
- Array Signal Processing
Background:
- Differential beamforming is crucial for spatial filtering in microphone arrays.
- Existing methods often have limitations regarding array geometry and frequency invariance.
Purpose of the Study:
- To develop a general algorithm for differential beamforming applicable to arbitrary planar microphone arrays.
- To achieve frequency-invariant beampatterns irrespective of the array's geometric configuration.
Main Methods:
- Approximation of the beampattern using the Jacobi-Anger expansion.
- Development of a beamforming algorithm utilizing sensor coordinates and wavelength constraints.
Main Results:
- The algorithm successfully forms specified frequency-invariant beampatterns for any planar array geometry.
- Demonstrated applicability to linear, circular, and arbitrary planar differential microphone arrays.
Conclusions:
- The proposed method offers a versatile approach to differential beamforming for diverse microphone array configurations.
- This technique enhances the design flexibility of acoustic beamformers for various applications.
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