Reference : Microphone arrays fundamentals

	Document type :	Scientific congresses and symposiums : Unpublished conference
	Discipline(s) :	Engineering, computing & technology : Electrical & electronics engineering
	To cite this reference:	http://hdl.handle.net/2268/119166

Title :	Microphone arrays fundamentals
Language :	English
Alternative title :	[en] Principes de base des réseaux de microphones
Author, co-author :	Embrechts, Jean-Jacques [Université de Liège - ULg > Dép. d'électric., électron. et informat. (Inst.Montefiore) > Techniques du son et de l'image >]
Publication date :	23-Nov-2011
Page number :	21
On invitation :	Yes
Audience :	National
Event name :	Journée ABAV "Multiple microphones systems"
Event date :	23/11/2011
Event organizer :	ABAV (Association belge des acousticiens)
Event place (city) :	Liège
Event country :	Belgique
Abstract :	[en] Microphone arrays are essentially directional sensors. They are therefore mainly used for locating, identifying, isolating, measuring and recording individual sound sources. The main principles governing the directivity of microphone arrays are reviewed: phase differences between signals create constructive and destructive interferences, depending on the direction of the sound source. Moreover, signal processing is applied to provide “beamforming”, i.e. beam shaping and steering. Contrary to continuous antenna, discrete arrays can create aliasing, which can result in false detections of sound sources. The delay-and-sum and filter-and-sum beamformers are described. Finally, as simple beamformers are often frequency dependent, some solutions to obtain constant (broad-band) directivity are presented.
Target :	Researchers ; Professionals ; Students
Permalink :	http://hdl.handle.net/2268/119166

	File(s) associated to this reference
	Fulltext file(s): File Commentary Version Size Access Open access Microphone arrays_Embrechts.pdf Author postprint 3.27 MB View/Open

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