MicrodB developed an algorithm named it : "nearfield focalisation".

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NIERFIELD FOCALISATION

In the family of "beamforming", MicrodB developed an algorithm which as well functions in far field (as the traditional method) but also in close field with the advantage of improving the resolution and MicrodB named it : "nearfield focalisation".

This technique carries out an operation of retropropagation like acoustic holography; if its principle of treatment is much simpler to apprehend since it is a question of adding with the sensors with delays corresponding to times of course, its algorithmy is much difficult since quantitative information is wished. It presents also the disadvantage of having a worth resolution in low frequencies.
On the other hand, this technique has two advantages :

It requires less sensors, which is an
advantage for the impulsive noises where
one wishes to have all the data at the time
of the same acquisition,

All the points of measurement are not
inevitably in the same plan, which becomes
an advantage for the structures of complex
form and measurements inside a cockpit.

Acoustic holography
Sound quality
Jury testing software