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The influence of microphone directivity on the level calibration and equalization of 3D loudspeakers setups

: Silzle, Andreas; Kosmidis, Dimitrios; Greco, Gil Felix; Beer, Daniel; Betz, Lorenz

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Verband Deutscher Tonmeister -VDT-:
29th Tonmeistertagung - VDT International Convention 2016 : Cologne, Germany, 17.11. – 20.11.2016
Bergisch-Gladbach: Verlag VDT, 2016
ISBN: 978-3-9812830-7-5
8 S.
Tonmeistertagung (TMT) <29, 2016, Cologne>
Konferenzbeitrag, Elektronische Publikation
Fraunhofer IDMT ()
Fraunhofer IIS ()

With increasing popularity of 3D sound formats the issue of correctly calibrating 3D loudspeaker systems arises. The typical calibration procedure involves a single-position measurement, where the elevation angle between the microphone and the different loudspeaker layers on the vertical plane is varying. Anechoic measurements of 1/2” and 1/4” microphones show that mainly the vertical angle affects the microphone directivity. Any angle other than 0° causes high-frequency attenuation, and this is mainly dependent on the microphone diameter. The result is an erroneous calculation of the level and frequency response of a loudspeaker in a listening room. In this paper, we derive a vertical angle- and microphone-diameter-dependent compensation and apply and verify it with measurements in an ITU-R BS.1116 conform listening room.