DocumentCode :
3465586
Title :
Nearfield broadband adaptive beamforming
Author :
Abhayapala, Thushara D. ; Kennedy, Rodney A. ; Williamson, Robert C. ; Ward, Darren B.
Author_Institution :
Inst. of Adv. Studies, Australian Nat. Univ., Canberra, ACT, Australia
Volume :
2
fYear :
1999
fDate :
1999
Firstpage :
839
Abstract :
A nearfield broadband adaptive beamforming approach based on the modal expansion of the solution to the spherical wave equation is formulated. It provides an efficient parameterization for the nearfield beamforming problem with a single parameter to focus the beamformer to a desired operating radius and a set of modal coefficients to control the angular response. As a consequence, the adaptive beamformer has a frequency invariant response for nearfield sources, decorrelates coherent interferers (thus combating signal cancellation) and has a smaller number of parameters to be adapted compared to a conventional beamformer. A simulation example is presented to demonstrate the use of the proposed method in microphone array applications in speech acquisition systems
Keywords :
acoustic signal processing; acoustic transducer arrays; array signal processing; microphones; angular response; decorrelation; frequency invariant response; microphone array applications; modal coefficients; modal expansion; nearfield broadband adaptive beamforming; operating radius; parameterization; speech acquisition systems; spherical wave equation; Apertures; Array signal processing; Australia; Bandwidth; Frequency; Interference cancellation; Microphone arrays; Partial differential equations; Sensor arrays; Speech;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Signal Processing and Its Applications, 1999. ISSPA '99. Proceedings of the Fifth International Symposium on
Conference_Location :
Brisbane, Qld.
Print_ISBN :
1-86435-451-8
Type :
conf
DOI :
10.1109/ISSPA.1999.815802
Filename :
815802
Link To Document :
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