Design of far-field and near-field broadband beamformers using eigenfilters

Authors:
Simon Doclo;Marc Moonen
Affiliations:
Katholieke Universiteit Leuven, Department of Electrical Engineering (ESAT-SCD), Kasteelpark Arenberg 10, B-3001 Heverlee (Leuven), Belgium;Katholieke Universiteit Leuven, Department of Electrical Engineering (ESAT-SCD), Kasteelpark Arenberg 10, B-3001 Heverlee (Leuven), Belgium
Venue:
Signal Processing
Year:
2003

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Abstract

This paper discusses two novel non-iterative design procedures based on eigenfilters for designing broadband beamformers with an arbitrary spatial directivity pattern for an arbitrary microphone configuration. In the conventional eigenfilter technique a reference frequency-angle point is required, whereas in the eigenfilter technique based on a TLS (total least squares) error criterion, no reference point is required. It is shown how to design broadband beamformers in the far-field, near-field and mixed near-field far-field of the microphone array. Both eigenfilter techniques are compared with other broadband beamformer design procedures (least-squares, maximum energy array, non-linear criterion). It will be shown by simulations that among the considered non-iterative design procedures the TLS eigenfilter technique has the best performance, i.e. best resembling the performance of the non-linear design procedure but having a significantly lower computational complexity.