Recording first-order Ambisonics with a differential array of two dual-diaphragm microphones

Deppisch T, Frank C. Recording first-order Ambisonics with a differential array of two dual-diaphragm microphones. In: AES Convention 148. Audio Engineering Society; 2020. Paper 589. Available from: https://aes.org/publications/elibrary-page/?id=20827

@inproceedings{Deppisch2020_20827,
  author = {Deppisch, Thomas and Frank, Christoph},
  title = {{Recording first-order Ambisonics with a differential array of two dual-diaphragm microphones}},
  booktitle = {AES Convention 148},
  note = {Paper 589},
  year = {2020},
  month = may,
  publisher = {Audio Engineering Society},
  url = {https://aes.org/publications/elibrary-page/?id=20827}
}

TY  - CPAPER
TI  - Recording first-order Ambisonics with a differential array of two dual-diaphragm microphones
AU  - Deppisch, Thomas
AU  - Frank, Christoph
T2  - AES Convention 148
M1  - Paper 589
PY  - 2020
DA  - 2020/05/06
UR  - https://aes.org/publications/elibrary-page/?id=20827
PB  - Audio Engineering Society
LA  - en
AB  - 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.
ER  -