Wideband beamforming using fan filter

Author

Nishikawa, Kiyoshi ; Yamamoto, Toshio ; Oto, Kaeuhiro ; Kanamori, Takeo

Author_Institution

Dept. of Electr. & Comput. Eng., Kanazawa Univ., Japan

Volume

2

fYear

1992

fDate

10-13 May 1992

Firstpage

533

Abstract

A novel approach to wideband beamforming using FIR (finite impulse response) fan filters is presented. The method is based on two-dimensional filtering for the outputs of a linear array of sensors. To beamform in the broadside of the array, a symmetrical 90°/n filter is employed. The filter in which the angle of fan is more acute can form the narrower beam over the full band while the order of the filter becomes higher. To beamform in the direction along the array, an asymmetrical 45° fan filter is used. As aliasing occurs in this beamforming, the band which is available is limited a little in width. A general implementation of the FIR fan filter beamformer is given as the parallel connection of one-dimensional FIR filters

Keywords

array signal processing; filtering and prediction theory; two-dimensional digital filters; 2D digital filter; FIR filters; aliasing; fan filter; finite impulse response; linear sensor array; parallel connection; two-dimensional filtering; wideband beamforming; Acoustical engineering; Array signal processing; Band pass filters; Digital filters; Finite impulse response filter; Frequency; Laboratories; Passband; Sensor arrays; Wideband;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems, 1992. ISCAS '92. Proceedings., 1992 IEEE International Symposium on

Conference_Location

San Diego, CA

Print_ISBN

0-7803-0593-0

Type

conf

DOI

10.1109/ISCAS.1992.230137

Filename

230137