A Second-Order Soundfield Microphone with Improved Polar Pattern Shape

Benjamin EM. A Second-Order Soundfield Microphone with Improved Polar Pattern Shape. In: AES Convention 133. Audio Engineering Society; 2012. Paper 8728. Available from: https://aes.org/publications/elibrary-page/?id=16470

@inproceedings{Benjamin2012_16470,
  author = {Benjamin, Eric M.},
  title = {{A Second-Order Soundfield Microphone with Improved Polar Pattern Shape}},
  booktitle = {AES Convention 133},
  note = {Paper 8728},
  year = {2012},
  month = oct,
  publisher = {Audio Engineering Society},
  url = {https://aes.org/publications/elibrary-page/?id=16470}
}

TY  - CPAPER
TI  - A Second-Order Soundfield Microphone with Improved Polar Pattern Shape
AU  - Benjamin, Eric M.
T2  - AES Convention 133
M1  - Paper 8728
PY  - 2012
DA  - 2012/10/06
UR  - https://aes.org/publications/elibrary-page/?id=16470
PB  - Audio Engineering Society
LA  - en
AB  - The soundfield microphone is a compact tetrahedral array of four figure-of-eight microphones yielding four coincident virtual microphones; one omnidirectional and three orthogonal pressure gradient microphones. As described by Gerzon, above a limiting frequency approximated by fc = pc/r, the virtual microphones become progressively contaminated by higher-order spherical harmonics. To improve the high-frequency performance, either the array size must be substantially reduced or a new array geometry must be found. In the present work an array having nominally octahedral geometry is described. It samples the spherical harmonics in a natural way and yields horizontal virtual microphones up to second order having excellent horizontal polar patterns up to 20 kHz.
ER  -