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First-order Ambisonics consists of four signals corresponding to one omnidirectional and three figure-of-eight polar patterns aligned with the Cartesian axes. We obtain these signals from a matched pair of dual-diaphragm microphones, where each diaphragm output is accessible individually. While the signals for figure-of-eight patterns in x- and y-direction are calculated directly from the microphone outputs, the z-direction figure-of-eight signal is calculated as di?erential signal from omnidirectional patterns of both microphones, resulting in low-frequency attenuation and a phase shift. We equalize the frequency response using a combination of a model-based IIR and a measurement-based FIR filter and provide an open-source plugin performing the processing.
Author (s): Deppisch, Thomas; Frank, Christoph
Affiliation:
University of Technology and University of Music and Performing Arts, Graz, Austria; Austrian Audio GmbH
(See document for exact affiliation information.)
AES Convention: 148
Paper Number:589
Publication Date:
2020-05-06
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Session subject:
Spatial Audio
Permalink: https://aes2.org/publications/elibrary-page/?id=20827
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Deppisch, Thomas; Frank, Christoph; 2020; Recording first-order Ambisonics with a differential array of two dual-diaphragm microphones [PDF]; University of Technology and University of Music and Performing Arts, Graz, Austria; Austrian Audio GmbH; Paper 589; Available from: https://aes2.org/publications/elibrary-page/?id=20827
Deppisch, Thomas; Frank, Christoph; Recording first-order Ambisonics with a differential array of two dual-diaphragm microphones [PDF]; University of Technology and University of Music and Performing Arts, Graz, Austria; Austrian Audio GmbH; Paper 589; 2020 Available: https://aes2.org/publications/elibrary-page/?id=20827