Paper Info
Title
A New Method To Design Steerable First-Order Differential Beamformers
Abstract
First-order differential microphone arrays (FODMAs), which combine a small-spacing uniform linear array and a first-order differential beamformer, have been used in a wide range of applications for sound and speech signal acquisition. However, traditional FODMAs are not steerable and their main lobe can only be at the endfire directions. To circumvent this problem, we propose in this letter a new method to design steerable FODMAs. We first divide the target beampattern into a sum of two sub-beampatterns, i.e., cardioid and dipole, where the summation is controlled by the steering angle. We then design two sub-beamformers, one is similar to the traditional approach and is used to achieve the cardioid sub-beampattern, while the other is designed to filter the squared observation signals and is used to approximate the dipole sub-beampattern. The overall beampattern resembles the target beampattern for any steering angle. Simulations and experiments are performed to justify the effectiveness of the developed method.
Year
DOI
Venue
2021
10.1109/LSP.2021.3059533
IEEE SIGNAL PROCESSING LETTERS
Keywords
DocType
Volume
Array signal processing, Microphone arrays, Design methodology, Noise reduction, Geometry, Speech enhancement, Solids, Differential beamforming, first-order differential beamformer, linear microphone arrays, steering
Journal
28
ISSN
Citations 
PageRank 
1070-9908
0
0.34
References 
Authors
0
3
Name
Order
Citations
PageRank
Xin Leng111.02
Jingdong Chen2113.29
Jacob Benesty31386136.42