Robust Hypercardioid Synthesis for Spatial Audio Capture: Microphone Geometry, Directivity and Regularization

Blanco Galindo M, Coleman P, Jackson PJB. Robust Hypercardioid Synthesis for Spatial Audio Capture: Microphone Geometry, Directivity and Regularization. In: AES Conference: 2019 AES International Conference on Immersive and Interactive Audio. Audio Engineering Society; 2019. Paper 49. Available from: https://aes.org/publications/elibrary-page/?id=20409

@inproceedings{BlancoGalindo2019_20409,
  author = {Blanco Galindo, Miguel and Coleman, Philip and Jackson, Philip J. B.},
  title = {{Robust Hypercardioid Synthesis for Spatial Audio Capture: Microphone Geometry, Directivity and Regularization}},
  booktitle = {AES Conference: 2019 AES International Conference on Immersive and Interactive Audio},
  note = {Paper 49},
  year = {2019},
  month = mar,
  publisher = {Audio Engineering Society},
  url = {https://aes.org/publications/elibrary-page/?id=20409}
}

TY  - CPAPER
TI  - Robust Hypercardioid Synthesis for Spatial Audio Capture: Microphone Geometry, Directivity and Regularization
AU  - Blanco Galindo, Miguel
AU  - Coleman, Philip
AU  - Jackson, Philip J. B.
T2  - AES Conference: 2019 AES International Conference on Immersive and Interactive Audio
M1  - Paper 49
PY  - 2019
DA  - 2019/03/06
UR  - https://aes.org/publications/elibrary-page/?id=20409
PB  - Audio Engineering Society
LA  - en
AB  - Frequency-invariant beamformers are useful for spatial audio capture since their attenuation of sources outside the look direction is consistent across frequency. In particular, the least-squares beamformer (LSB) approximates arbitrary frequency-invariant beampatterns with generic microphone configurations. This paper investigates the effects of array geometry, directivity order and regularization for robust hypercardioid synthesis up to 15th order with the LSB, using three 2D 32-microphone array designs (rectangular grid, open circular, and circular with cylindrical baffle). While the directivity increases with order, the frequency range is inversely proportional to the order and is widest for the cylindrical array. Regularization results in broadening of the mainlobe and reduced on-axis response at low frequencies. The PEASS toolkit was used to evaluate perceptually beamformed speech signals.
ER  -