Matrix Voice has 8 Microphones,  building a circular microphone array.

With the following coordinates:

Mic     X     Y

M1     00.00     0.00

M2     -38.13     3.58

M3     -20.98     32.04

M4     11.97     36.38

M5     35.91     13.32

M6     32.81     -19.77

M7     5.00     -37.97

M8     -26.57     -27.58

Circular microphone arrays are useful in a speech recognition application. The following image shows the beam pattern of the array with