Superdirective Microphone Arrays

Autoren:	J. Bitzer, K.U. Simmer
Kurzfassung:	This chapter gives an overview of so-called superdirective beamformers, which can be derived by applying the minimum variance distortionless response (MVDR) principle to theoretically well-defined noise fields, as for example the diffuse noise field. We show that all relevant performance measures for beamformer designs are functions of the coherence matrix of the noise field. Additionally, we present unconstrained and constrained MVDR-solutions using modified coherence functions. Solutions for different choices of the optimization criterion are given including a new solution to optimize the front-to-back ratio. Finally, we present a comparison of superdirective beamformers to gradient microphones and an alternative generalized sidelobe canceller (GSC) implementation of the superdirective beamformer.
Dokumenttyp:	Buchkapitel
in Buch:	Microphone Arrays
Veröffentlichung:	Springer, Berlin, Heidelberg, New York, Mai 2001
Seiten:	19-37
Index:	118
Dateien:	BibT_EX

Zuletzt aktualisiert am 29.05.2008 von Admin