Multiple beam broadband beamforming: filter design and real-time implementation

Author

Van Gerven, Stefaan ; Van Compernolle, Dirk ; Wauters, Piet ; Verstraeten, Wim ; Eneman, Koen ; Delaet, Kristof

Author_Institution

Dept. of Electr. Eng., Katholieke Univ., Leuven, Belgium

fYear

1995

fDate

15-18 Oct 1995

Firstpage

173

Lastpage

176

Abstract

In this paper the design and implementation of a truly broadband beamformer is described. Using only a limited number of microphones a beamformer has been developed with a reasonably homogeneous beampattern over the entire speech bandwidth. The solution is obtained as the result of a filter-and-sum operation. Beams are steered towards different listening-directions and for each direction a set of spatio-temporal filters had to be designed. All beams operate in parallel and a beam-selection procedure picks out the beam with the most prominent speech signal. The complete system has been implemented in real-time using 1 MOTOROLA-56001 and 4 TMS-320C40 processors

Keywords

acoustic signal processing; acoustic transducer arrays; antenna arrays; array signal processing; digital filters; microphones; real-time systems; MOTOROLA-56001; TMS-320C40; beam-selection procedure; filter design; filter-and-sum operation; homogeneous beampattern; listening-direction; multiple beam broadband beamforming; real-time implementation; spatio-temporal filters; speech bandwidth; Array signal processing; Bandwidth; Delay; Filters; Frequency; Least squares methods; Microphone arrays; Real time systems; Smoothing methods; Speech;

fLanguage

English

Publisher

ieee

Conference_Titel

Applications of Signal Processing to Audio and Acoustics, 1995., IEEE ASSP Workshop on

Conference_Location

New Paltz, NY

Print_ISBN

0-7803-3064-1

Type

conf

DOI

10.1109/ASPAA.1995.482984

Filename

482984