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Analysis and adjustment of planar microphone arrays for application in directional audio coding

Analyse und Einstellung planarer Mikrofonanordnungen für die Richtungs-Audiocodierung
: Kallinger, M.; Küch, F.; Schultz-Amling, R.; Galdo, G. del; Ahonen, J.; Pulkki, V.

Audio Engineering Society -AES-:
124th Audio Engineering Society Convention 2008. Vol.1 : May 17 - 20, 2008, Amsterdam, the Netherlands
Red Hook, NY: Curran, 2008
ISBN: 978-1-605-60295-0
Audio Engineering Society (Convention) <124, 2008, Amsterdam>
Conference Paper
Fraunhofer IIS ()

Directional Audio Coding (DirAC) is a well-established and efficient way to capture and reproduce a spatial sound event. In a recording room, DirAC requires four spatially coincident microphones to estimate the desired parameters, i.e., direction-of-arrival and diffuseness of sound: one omnidirectional and three figureof-eight microphones pointing along the axes of a three-dimensional Cartesian coordinate system. In most consumer applications only two dimensional scenes need to be reproduced, implying that only two figure-of-eight microphones are required. Furthermore, instead of directional microphones, arrays of omnidirectional microphones are considered for economic reasons. Therefore, it are investigated various two-dimensional micro phone configurations with respect to their usability for DirAC. Theoretical limits are derived for the correct estimation of both direction-of-arrival and diffuseness for the most suitable planar arrays. Furthermore, a way is suggested to equalize the systematic bias for the direction-of-arrival estimation, introduced by the discrete planar arrays.