Spatial Filtering Using A Higher-Order Differential Microphone Array

Konferenz: Sprachkommunikation 2008 - 8. ITG-Fachtagung
08.10.2008 - 10.10.2008 in Aachen, Germany

Tagungsband: Sprachkommunikation 2008

Seiten: 4Sprache: EnglischTyp: PDF

Persönliche VDE-Mitglieder erhalten auf diesen Artikel 10% Rabatt

Eichler, Martin; Lacroix, Arild (Institut f ür Angewandte Physik, J. W. Goethe-Universität, Max-von-Laue-Straße 1, 60438 Frankfurt)

Beamforming techniques are applied in sensor array processing in order to achieve a directivity characteristic, the so-called beam pattern, allowing the sensor array to spatially distinguish received signals. In this contribution, an approach is presented where microphones arranged in symmetric polygons are used to build sinusoidal directivity patterns, serving as a set of orthogonal base beam patterns from which a desired directivity can be constructed by linear combination. Both the theoretical background of this technique and some example measurement results are discussed.