NDLI: Uniform circular broadband beamformer with selective frequency and spatial invariant region

Content Provider	IEEE Xplore Digital Library
Author	Xin Zhang Wee Ser Muralidhar, K.
Copyright Year	2009
Description	Author affiliation: Centre for Signal Processing, School of Electrical and Electronic Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798 (Xin Zhang; Wee Ser) \|\| R & D Department, STMicroelectronics, 5A Serangoon North Avenue 5, Singapore 554574 (Muralidhar, K.)
Abstract	Most existing frequency-invariant (FI) beamformer algorithms design array beampattern response across the entire frequency bands. In this paper, the design of array gain response is extended to both selective frequency and spatial region. The algorithm consists of an objective function that has a two-dimensional constraint. One dimension constraint is on frequency range; this is to ensure a selective frequency invariant region is formed. The second dimension constraint is on spatial direction; this is to maintain the array response of the beamformer constant for a small amount of angle centered at the desired direction. Having such constant gain response over a selective spatial region makes the array beamformer less sensitive to the exact position of the source. Advanced optimization method such as Second Order Cone Programming (SOCP) is used to solve this complex optimization problem with high efficiency and accuracy. Simulation results are compared with other existing algorithms. It demonstrates that the proposed method is able to achieve a constant gain over the specified sector of angle and at the same time having a lower mean square error on the FI performance over the specified frequency region.
Starting Page	2201
Ending Page	2204
File Size	688789
Page Count	4
File Format	PDF
ISBN	9781424438273
DOI	10.1109/ISCAS.2009.5118234
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2009-05-24
Publisher Place	Taiwan
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Array signal processing Signal processing algorithms Design engineering Signal design Optimization methods Microphone arrays Signal synthesis Frequency synthesizers Signal processing Algorithm design and analysis
Content Type	Text
Resource Type	Article

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