Hi,
I suppose the question implies the concern for the necessity of the beamforming, or maybe
alternatives. It isn't too difficult to do a little estimation about what is going to
happen with your setup when signals come from various sides and angles, assuming a sample
delay corresponds to about 7 millimeters of "wavelength" at 48 kHz. For the higher
frequencies, when summing over the two 15 cm apart sides, a little angle will create a 7
or 14 mm delay difference which will lead to cancellation and amplification of high
frequencies. How bad that is, depends, in the worst case, somebody talking on the phone,
or that the application is, from the side, at 15 cm there will be a cancellation at a few
kilohertz, which could be tricky.
To prevent "frost" or other types of intelligent beam forming (might be a fun project,
though!) you could consider adding the somewhat lower frequencies from all 4 mics, and
using only 1 for the highest frequencies.
T.V.
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