Analysis
of the characteristics of a particular noise (from a fan, or a pump, f.i.),
in some instances makes it possible to design a system capable of giving
an excitation in counterphase, thus reducing the noise itself.
Before
doing that, of course, you must make use of every classical,
"passive", noise reduction methods.
In
this field, we have the correct expertise, and we are capable of
developing an entire system, from design to layout, software and
firmware.