Unpublished conference/Abstract (Scientific congresses and symposiums)
Microphone arrays fundamentals
Embrechts, Jean-Jacques
2011Journée ABAV "Multiple microphones systems"
 

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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.
Disciplines :
Electrical & electronics engineering
Author, co-author :
Embrechts, Jean-Jacques ;  Université de Liège - ULiège > Dép. d'électric., électron. et informat. (Inst.Montefiore) > Techniques du son et de l'image
Language :
English
Title :
Microphone arrays fundamentals
Alternative titles :
[fr] Principes de base des réseaux de microphones
Publication date :
23 November 2011
Number of pages :
21
Event name :
Journée ABAV "Multiple microphones systems"
Event organizer :
ABAV (Association belge des acousticiens)
Event place :
Liège, Belgium
Event date :
23/11/2011
By request :
Yes
Available on ORBi :
since 03 May 2012

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