Two versions of the microphone Array have been tested, the latest version is ready for production (KiCAD files in the repo).

The second version of the controller card is being assembled, we hope to test it soon (KiCAD files in the repo).

We are  using an implementation of CIC filters [1] within the FPGA (code based on Matrix Voice HDL [2])

[1] https://en.wikipedia.org/wiki/Cascaded_integrator%E2%80%93comb_filter

[2] https://github.com/matrix-io/matrix-voice-fpga

The initial software tests utilize ODAS for sound source localization [3]

[3] https://github.com/introlab/odas

The  license for software is GNU General Public License v3.0

The  license for hardware  is CERN Open Hardware Licence Version 2